Damaging offshore winds may down trees and power lines and fire weather threats across much of California. Critical fire weather threats are expected in the central and southern coastal ranges. Heavy snow is continuing in the Great Lakes, and will develop in the Central and Southern Rockies. High winds and heavy snow is occurring for parts of Alaska. Heavy rain in Hawaii will continue. Read More >
Overview
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Storm Reports
Regional Storm Reports | Local Storm Reports | ||
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PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE CHICAGO IL 1255 PM CDT FRI AUG 14 2020 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0215 PM TSTM WND GST FORRESTON 42.13N 89.58W 08/10/2020 E100 MPH OGLE IL NWS STORM SURVEY *** 5 INJ *** UPDATES PREVIOUS TSTM WIND DMG REPORT FROM FORRESTON. SEVERAL TRAILERS WERE DAMAGED OR DESTROYED. SIGNIFICANT DAMAGE WAS DONE TO A METAL BUILDING NEAR THE BP GAS STATION WITH ASSOCIATED DEBRIS BLOWN TOWARD THE NORTHEAST. WIDESPREAD TREE DAMAGE WAS ALSO NOTED. ALTOGETHER, THE DAMAGE WAS CONSISTENT WITH STRAIGHT LINE WINDS AROUND 100 MPH. 0225 PM TSTM WND DMG HARMON 41.72N 89.55W 08/10/2020 LEE IL TRAINED SPOTTER SEVERAL BRANCHES DOWN. EXTERIOR SIDE OF HOUSE PEELED AWAY. 0239 PM TSTM WND GST 4 SSW DIXON 41.78N 89.50W 08/10/2020 M92 MPH LEE IL PUBLIC PRIVATE WEATHER STATION OBSERVED 92 MPH WIND GUST JUST SOUTH OF DIXON AT 2:39 PM. 20-30 MINUTES OF WINDS GUSTING MORE THAN 50MPH. 0240 PM TSTM WND DMG 2 SE ROCKFORD 42.25N 89.07W 08/10/2020 WINNEBAGO IL TRAINED SPOTTER LARGE LIMB DOWN. TIME ESTIMATED BY RADAR. 0240 PM TSTM WND DMG 2 NW HILLCREST 41.97N 89.09W 08/10/2020 OGLE IL BROADCAST MEDIA LARGE TREE LIMB DOWN. TIME ESTIMATED BY RADAR. 0240 PM TSTM WND GST 1 NE CEDAR POINT 41.27N 89.11W 08/10/2020 M91 MPH LA SALLE IL TRAINED SPOTTER TREE DAMAGE, POWER LINES DOWN, 2 SEMIS OVERTURNED, SNAPPED TRAFFIC SIGNS, AND ROOF DAMAGE TO HOMES REPORTED. TIME ESTIMATED BY RADAR. 0243 PM TSTM WND DMG 2 N PERU 41.35N 89.12W 08/10/2020 LA SALLE IL BROADCAST MEDIA *** 1 INJ *** CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 N PERU FOR INCLUDING ONE INJURY THAT WAS THE TRUCK DRIVER, AS REPORTED BY AREA RADIO STATION WLPO. SEMI TRAILER BLOWN OVER ON IL 251. TIME ESTIMATED BY RADAR. 0245 PM TSTM WND DMG 3 SE LOVES PARK 42.28N 89.03W 08/10/2020 WINNEBAGO IL PUBLIC IN ROCKFORD, LOTS OF DOWNED TREES, POWER LINES AND POLES, AND FENCES NORTHEAST OF THE AREA FROM NEAR THE NORTH ALPINE AND GUILFORD INTERSECTION THRU SHAW WOODS TO THE MULFORD RD AND SPRINGBROOK ROAD INTERSECTION AND ACROSS ROCK VALLEY COLLEGE. 0245 PM TSTM WND DMG 1 ESE ROCKFORD 42.26N 89.07W 08/10/2020 WINNEBAGO IL PUBLIC 1 FOOT DIAMETER BRANCH DOWNED. WINDS ESTIMATED AT 60 MPH. TIME ESTIMATED BY RADAR. 0245 PM TSTM WND DMG ROCKFORD 42.27N 89.09W 08/10/2020 WINNEBAGO IL TRAINED SPOTTER TRAINED SPOTTER REPORTS WIDESPREAD TREE DAMAGE IN ROCKFORD. MEDIUM TO LARGE BRANCHES AND TREES SNAPPED. 0245 PM TSTM WND GST MENDOTA 41.55N 89.12W 08/10/2020 E80 MPH LA SALLE IL NWS EMPLOYEE CORRECTS PREVIOUS TSTM WND GST REPORT FROM MENDOTA. WIND GUSTS TO SEVERE LIMITS WERE FREQUENT FOR 30 MINUTES AFTER THEY STARTED. THE PEAK GUST WAS ESTIMATED TO BE AROUND 80 MPH. SEVERAL LARGE TREES DOWNED IN TOWN. 0246 PM TSTM WND DMG 2 NNE MENDOTA 41.58N 89.10W 08/10/2020 LA SALLE IL PUBLIC THUNDERSTORM DOWNED LARGE TREE ON THE PROPERTY OF A MANUFACTURED HOME AND IMPALED A SMALL BRANCH FROM THIS INTO ONE OF THE WALLS. TIME ESTIMATED FROM RADAR. 0247 PM TORNADO 2 SW ROCKFORD 42.26N 89.12W 08/10/2020 WINNEBAGO IL NWS STORM SURVEY A VERY BRIEF TORNADO WITH PEAK WINDS OF 75 MPH AND PATH LENGTH OF 1.5 MILES TOUCHED DOWN NEAR THE INTERSECTION OF PIERPONT AVE AND MONTAGUE ROAD AND CONTINUED NORTHEAST INTO THE SOUTHWEST SIDE OF ROCKFORD. THE TORNADO ENDED NEAR THE INTERSECTION OF FERGUSON AND LOOMIS STREETS. ALL DAMAGE WAS TO TREES ALONG THE TORNADO PATH. 0247 PM TORNADO 4 SE MACHESNEY PARK 42.31N 88.98W 08/10/2020 WINNEBAGO IL NWS STORM SURVEY AN EF-1 TORNADO WITH PEAK WINDS OF 100 MPH AND PATH LENGTH OF 9.2 TOUCHED DOWN JUST NORTH OF ROCKFORD COLLEGE AND TRAVELED NORTHEAST INTO CALEDONIA. SIGNIFICANT TREE DAMAGE CONSISTENT WITH EF-1 SPEEDS OCCURED IN A LOCALIZED AREA NEAR ROCK VALLEY COLLEGE WITH SPORADIC DAMAGE THEREAFTER. THIS TORNADO WAS PRODUCED BY A SUPERCELL THUNDERSTORM WHICH HAD ALREADY PRODUCED A BRIEF TORNADO UPSTREAM. 0248 PM TSTM WND DMG CRESTON 41.93N 88.96W 08/10/2020 OGLE IL TRAINED SPOTTER LARGE TREE LIMBS DOWNED. TIME ESTIMATED BY RADAR. 0250 PM TSTM WND DMG 3 E LOVES PARK 42.31N 89.00W 08/10/2020 WINNEBAGO IL BROADCAST MEDIA LARGE TREES SNAPPED AND LARGE LIMBS DOWN ON THE ROCK VALLEY COLLEGE CAMPUS. TIME ESTIMATED BY RADAR. 0252 PM TSTM WND DMG 4 ESE MACHESNEY PARK 42.32N 88.98W 08/10/2020 WINNEBAGO IL PUBLIC FARM AND FLEET ON EAST RIVERSIDE ROAD IN LOVES PARK LOST A GOOD PORTION OF ITS ROOF. 0253 PM HAIL 4 NNW CHERRY VALLEY 42.29N 88.98W 08/10/2020 E1.00 INCH WINNEBAGO IL TRAINED SPOTTER 0253 PM TSTM WND GST LEE 41.79N 88.94W 08/10/2020 E75 MPH DE KALB IL TRAINED SPOTTER ESTIMATED 70 TO 80 MPH WINDS AND DIME SIZE HAIL. 0250 PM TORNADO 2 NNE KIRKLAND 42.11N 88.81W 08/10/2020 DE KALB IL FIRE DEPT/RESCUE DRONE FOOTAGE SHOWS A NARROW SWATH OF CORN FLATTENED IN A CONVERGENT PATTERN. THIS BRIEF EF-0 TORNADO CROSSED BUCK ROAD AND PEARL STREET BEFORE LIFTING IN A FIELD EAST OF MYELLE ROAD. 0255 PM TSTM WND DMG 4 SW CALEDONIA 42.33N 88.95W 08/10/2020 WINNEBAGO IL PUBLIC TREE DOWN AND DAMAGE TO A METAL STRUCTURE. TIME ESTIMATED BY RADAR. 0256 PM TSTM WND DMG UTICA 41.34N 89.01W 08/10/2020 LA SALLE IL TRAINED SPOTTER REPORTS OF DAMAGE TO ROOFS AND OUTSIDE STRUCTUERS IN UTICA. TIME ESTIMATED BY RADAR. 0259 PM TORNADO OTTAWA 41.35N 88.84W 08/10/2020 LA SALLE IL NWS STORM SURVEY A BRIEF EF-1 TORNADO WITH PEAK WINDS OF 100 MPH, PATH LENGTH OF 0.75 MILES, AND MAX WIDTH OF 150 YARDS IMPACTED THE NORTH SIDE OF OTTAWA DAMAGING ROOFING MATERIAL AND SHREDDING TREES ALONG ITS PATH. THE ROOFING MATERIAL WAS ORIGINALLY WELL-ANCHORED TO THE WALLS, AND A NEARBY SNAPPED POWER POLE SUGGESTED A PEAK INTENSITY OF 100 MPH WINDS. EYE WITNESS ACCOUNTS CONFIRM THE DAMAGE WAS PRODUCED BY A TORNADO BASED ON CLEARLY RISING AND SWIRLING MOTION BY MULTIPLE SUB-VORTICES IN A BROAD CIRCULATION. 0259 PM TSTM WND GST SOMONAUK 41.63N 88.67W 08/10/2020 E90 MPH DE KALB IL PUBLIC AN NWS DAMAGE SURVEY FOUND WIDESPREAD TREE DAMAGE WITH A FEW TREES SNAPPED VERY NEAR THEIR BASE. SEVEN LARGE AND NEW UTILITY POLES WERE ALSO SNAPPED ABOUT 10 FEET UP FROM THEIR BASE THREE MILES NORTH OF SOMONAUK. THE DAMAGE WAS CONSISTENT WITH WINDS UP TO AROUND 90 MPH. 0300 PM TSTM WND DMG 1 E ROCKFORD 42.27N 89.08W 08/10/2020 WINNEBAGO IL FIRE DEPT/RESCUE ROCKFORD FIRE CHIEF REPORTS AT LEAST 150 DAMAGED POWER POLES ACROSS THE CITY. 0300 PM HAIL 1 WNW BELVIDERE 42.26N 88.86W 08/10/2020 E1.00 INCH BOONE IL TRAINED SPOTTER 0302 PM TSTM WND DMG STREATOR 41.12N 88.83W 08/10/2020 LA SALLE IL FIRE DEPT/RESCUE SEVERAL TREES SNAPPED AND UPROOTED. TIME ESTIMATED BY RADAR. 0305 PM TORNADO 3 S MARENGO 42.21N 88.60W 08/10/2020 MCHENRY IL NWS STORM SURVEY AN EF-1 TORNADO WITH PEAK WINDS OF 95 MPH AND PATH LENGTH OF 5.7 MILES TOUCHED DOWN ON HARMONY ROAD SOUTHWEST OF I-90 AND CONTINUED NORTHEAST BEFORE LIFTING NEAR DUNHAM ROAD BETWEEN MARENGO AND UNION. MOST DAMAGE WAS CONFINED TO TREES AND TO FARM BUILDINGS ALONG THE PATH. 0305 PM TSTM WND DMG DEKALB 41.93N 88.75W 08/10/2020 DE KALB IL TRAINED SPOTTER MULTIPLE TREES AND POWER LINES DOWN. ESTIMATED 60 MPH GUSTS. 0310 PM TSTM WND DMG MAPLE PARK 41.91N 88.60W 08/10/2020 KANE IL TRAINED SPOTTER MULTIPLE TREES AND POWER LINES DOWN, INCLUDING 10 AND 20 INCH IN DIAMETER TREES. FENCES ALSO BLOWN DOWN. TIME ESTIMATED BY RADAR. 0312 PM TORNADO 3 SSW VIRGIL 41.92N 88.55W 08/10/2020 KANE IL PUBLIC DRONE FOOTAGE REVEALS A NARROW SWATH OF CORN LIKELY AROUND 40 YARDS ACROSS FLATTENED IN A CONVERGENT PATTERN. IN ADDITION, DAMAGE TO A BARN WAS NOTED, WITH A NEAR COMPLETE REMOVAL OF THE ROOF. THIS DAMAGE IS CONSISTENT WITH A TORNADO WITH WINDS OF EF-1 INTENSITY. 0314 PM TSTM WND GST 2 ESE SOMONAUK 41.62N 88.65W 08/10/2020 M57 MPH LA SALLE IL PUBLIC PRIVATE WEATHER STATION OBSERVED 57 MPH WIND GUST NEAR LAKE HOLIDAY. WIND GUSTS OVER 50 MPH FOR AT LEAST 15 MINUTES. 0314 PM TSTM WND GST 3 SSE PLANO 41.63N 88.51W 08/10/2020 M65 MPH KENDALL IL PUBLIC PRIVATE WEATHER STATION RECORDED 65 MPH WIND GUST. 0315 PM TSTM WND GST 3 N PONTIAC 40.92N 88.63W 08/10/2020 M54 MPH LIVINGSTON IL AWOS PONTIAC AWOS PEAK GUST. 0315 PM TORNADO 5 W PLAINFIELD 41.60N 88.31W 08/10/2020 KENDALL IL NWS STORM SURVEY AN EF-1 TORNADO WITH PEAK WINDS OF 105 MPH, PATH LENGTH OF 14.5 MILES, AND MAX WIDTH OF 250 YARDS STARTED ON THE SOUTH SIDE OF YORKVILLE DESTROYING A PERGOLA, TAKING SIDING OFF A HOUSE, AND THROWING A TREE ACROSS A ROAD. THE TORNADO THEN CONTINUED SOUTHEAST AND DAMAGED SEVERAL FARMSTEADS INCLUDING THROWING A SHED SEVERAL HUNDRED FEET INTO A FIELD AND SCOURING GRASS. SEVERAL POWER POLES WERE SNAPPED AT THEIR BASE, AS WELL. THE TORNADO CROSSED INTO WILL COUNTY SOUTH OF PLAINFIELD AND CONTINUED DAMAGING TREES UNTIL ENDING JUST WEST OF I-55 NEAR CANTON FARM ROAD. A BROAD AREA OF WIND GUSTS OF 70 TO 80 MPH THEN FOLLOWED INTO CREST HILL LEADING TO PROLIFIC TREE DAMAGE. 0315 PM TSTM WND DMG 3 E KANEVILLE 41.83N 88.47W 08/10/2020 KANE IL TRAINED SPOTTER 8 INCH DIAMETER TREE SNAPPED NEAR IL-47 AND NOTTINGHAM. RELAYED VIA NWS CHAT, TIME ESTIMATED BY RADAR. 0315 PM TSTM WND DMG 3 ESE MAPLE PARK 41.90N 88.54W 08/10/2020 KANE IL TRAINED SPOTTER 4 INCH DIAMETER BRANCH DOWNED AND DAMAGE TO TRAFFIC SIGNALS AT IL-38 AND MEREDITH ROAD. TIME ESTIMATED BY RADAR. 0315 PM TSTM WND DMG SOMONAUK 41.63N 88.68W 08/10/2020 DE KALB IL TRAINED SPOTTER TRAINED SPOTTER REPORTS WIDESPREAD TREE AND POWER LINE DAMAGE ACROSS SOMANAUK. TREES UP TO 4-6 DIAMETER SNAPPED AT THE BASE. 0316 PM TSTM WND GST 1 WNW SUGAR GROVE 41.77N 88.47W 08/10/2020 M62 MPH KANE IL ASOS AURORA ASOS PEAK GUST. 0316 PM TSTM WND GST 2 W SUGAR GROVE 41.77N 88.48W 08/10/2020 M62 MPH KANE IL ASOS 0317 PM TSTM WND DMG DWIGHT 41.10N 88.43W 08/10/2020 LIVINGSTON IL TRAINED SPOTTER NUMEROUS METAL FARM BUILDINGS DAMAGED INCLUDING ROOFS AND METAL SIDINGS BLOWN OFF. ALSO, LARGE TREE SNAPPED AND DOWNED ONTO A HOUSE. TIME ESTIMATED BY RADAR. 0320 PM TSTM WND DMG YORKVILLE 41.64N 88.45W 08/10/2020 KENDALL IL TRAINED SPOTTER SEVERAL TREES AND LARGE BRANCHES DOWN. TIME ESTIMATED BY RADAR. 0320 PM TSTM WND DMG 2 W SUGAR GROVE 41.76N 88.48W 08/10/2020 KANE IL TRAINED SPOTTER TREE DAMAGE BLOCKING FAYS LANE WEST OF SUGAR GROVE. TIME ESTIMATED BY RADAR. 0320 PM TSTM WND DMG AURORA 41.76N 88.32W 08/10/2020 KANE IL TRAINED SPOTTER 10 INCH DIAMETER TREE SNAPPED. TIME ESTIMATED BY RADAR. 0323 PM TSTM WND GST ROCKFORD AIRPORT 42.20N 89.10W 08/10/2020 M54 MPH WINNEBAGO IL ASOS ROCKFORD ASOS PEAK GUST. 0327 PM HAIL MORRIS 41.36N 88.42W 08/10/2020 M1.00 INCH GRUNDY IL TRAINED SPOTTER TIME ESTIMATED BY RADAR. 0327 PM TSTM WND DMG 1 SE WAYNE 41.94N 88.24W 08/10/2020 DUPAGE IL COUNTY OFFICIAL TREE DOWN ON ROAD NEAR NANCY LN AND POWIS RD IN WAYNE. 0329 PM TSTM WND DMG ST. CHARLES 41.91N 88.31W 08/10/2020 KANE IL PUBLIC 14 INCH DIAMETER TREE SPLIT IN HALF. POWER LINES DOWNED. TIME ESTIMATED BY RADAR. 0330 PM TSTM WND DMG 1 WSW CRYSTAL LAWNS 41.57N 88.18W 08/10/2020 WILL IL TRAINED SPOTTER 8-IN DIAMETER BRANCHES DOWN NEAR I-55 AND CATON FARM ROAD. RELAYED VIA AMATEUR RADIO. TIME ESTIMATED BY RADAR. 0330 PM TSTM WND DMG RICHMOND 42.48N 88.31W 08/10/2020 MCHENRY IL PUBLIC TREE OVER 12 INCHES IN DIAMETER SNAPPED. NEAR US-12 AND IL-173. 0330 PM TSTM WND DMG FORREST 40.75N 88.41W 08/10/2020 LIVINGSTON IL PUBLIC VIDEO RELAYED VIA SOCIAL MEDIA OF TREE DAMAGE IN FORREST. 0330 PM TSTM WND DMG 4 NW PLAINFIELD 41.65N 88.27W 08/10/2020 KENDALL IL PUBLIC DAMAGE TO SIDING OF A HOUSE. SMALL BRANCHES DOWNED IN THE VICINITY. TIME ESTIMATED BY RADAR. 0330 PM HAIL 2 NNW MORRIS 41.38N 88.43W 08/10/2020 E1.75 INCH GRUNDY IL LAW ENFORCEMENT LAW ENFORCEMENT REPORTS GOLFBALL SIZED HAIL NEAR I-80 AND LISBON ROAD. 0331 PM TSTM WND DMG PLAINFIELD 41.61N 88.21W 08/10/2020 WILL IL TRAINED SPOTTER LARGE TREES AND POWER LINES DOWN ACROSS PLAINFIELD. TIME ESTIMATED BY RADAR. 0332 PM TSTM WND GST 2 N PLAINFIELD 41.64N 88.20W 08/10/2020 M84 MPH WILL IL MESONET MEASURED BY WEATHERBUG STATION. 0333 PM TSTM WND DMG 3 NW SHOREWOOD 41.56N 88.23W 08/10/2020 WILL IL PUBLIC PUBLIC REPORTS TREES DOWN NEAR CATON FARM ROAD AND DRAUDEN ROAD. 0334 PM TSTM WND DMG WHEATON 41.87N 88.11W 08/10/2020 DUPAGE IL TRAINED SPOTTER SIX INCH DIAMETER TREE LIMB DOWN. TIME ESTIMATED BY RADAR. 0335 PM TSTM WND GST 5 SE LISBON 41.43N 88.42W 08/10/2020 M59 MPH GRUNDY IL AWOS KC09 MORRIS AIRPORT. 0335 PM TORNADO 1 ENE WHEATON 41.87N 88.10W 08/10/2020 DUPAGE IL NWS STORM SURVEY CORRECTS PREVIOUS TORNADO REPORT FROM 1 ENE WHEATON. A VERY BRIEF EF-1 TORNADO TOUCHED DOWN NEAR THE INTERSECTION OF SEMINARY AVENUE AND SCOTT STREET BEFORE MOVING NORTHEAST WHERE IT KNOCKED A ROUGHLY 50 FOOT STEEPLE AROUND TO THE NORTH SIDE OF THE COLLEGE CHURCH IN WHEATON. THE TORNADO THEN PRODUCED MINOR TREE DAMAGE BEFORE LIFTING NEAR COLLEGE AVENUE AND HOWARD STREET. 0335 PM TSTM WND DMG WARRENVILLE 41.82N 88.17W 08/10/2020 DUPAGE IL TRAINED SPOTTER TRAINED SPOTTER REPORTS 1-6 IN DIAMETER TREE BRANCHES DOWN ALL OVER WARRENVILLE. 0336 PM TSTM WND GST GLEN ELLYN 41.87N 88.06W 08/10/2020 E90 MPH DUPAGE IL NWS STORM SURVEY AN NWS DAMAGE SURVEY DETERMINED A CORRIDOR OF ENHANCED STRAIGHT LINE WINDS DAMAGED TREES AND UTILITY POLES WITH THE MOST CONCENTRATED DAMAGE EAST OF NORTH MAIN STREET TOWARD LAKE ELLYN PARK. DAMAGE IN THE REGION WAS CONSISTENT WITH WIND SPEEDS UP TO 90 MPH. 0336 PM TSTM WND DMG VILLA PARK 41.89N 87.98W 08/10/2020 DUPAGE IL TRAINED SPOTTER 12 INCH DIAMETER TREE DOWN ON HOUSE. TIME ESTIMATED BY RADAR. 0336 PM TSTM WND DMG 2 W STREAMWOOD 42.02N 88.22W 08/10/2020 COOK IL TRAINED SPOTTER ROLLED OVER B-CLASS TRUCK WITH TRAILER AT IRVING PARK ROAD AND SCHAUMBURG ROAD. 0338 PM TSTM WND GST DUPAGE AIRPORT 41.92N 88.25W 08/10/2020 M62 MPH DUPAGE IL ASOS KDPA WEST CHICAGO - DUPAGE ARPT. 0339 PM TSTM WND DMG BOLINGBROOK 41.70N 88.07W 08/10/2020 WILL IL TRAINED SPOTTER LARGE TREE LIMBS AND SMALL TREES DOWN. TIME ESTIMATED BY RADAR. 0339 PM TORNADO 1 NNE LOMBARD 41.89N 88.00W 08/10/2020 DUPAGE IL NWS STORM SURVEY CORRECTS PREVIOUS TORNADO REPORT FROM 1 NNE LOMBARD. THE SAME STORM WHICH PRODUCED THE BRIEF WHEATON TORNADO PRODUCED ANOTHER REGION OF EF-1 TORNADO DAMAGE IMMEDIATELY EAST OF I-355 JUST EAST OF LILACIA PARK. THIS TORNADO ALSO CONTINUED IN A NORTHEASTERLY DIRECTION, UPROOTING TREES--SOME SNAPPED AT THE TRUNK--AS WELL AS CAUSING SOME HOUSE DAMAGE INCLUDING A FEW WITH SUBSTANTIAL ROOF DAMAGE. THE WORST DAMAGE OCCURRED NEAR AND AROUND THE LOMBARD COMMON JUST SOUTH OF ST. CHARLES ROAD. DAMAGE EASED CONSIDERABLY ON THE NORTH SIDE OF THE CIRCULATION, WITH A MORE GRADUAL DROP OFF IN DAMAGE TO ITS SOUTH. THE TORNADO LIFTED JUST NORTHEAST OF THE JEFFERSON MIDDLE SCHOOL. 0339 PM TSTM WND GST SCHAUMBURG 42.03N 88.08W 08/10/2020 E65 MPH COOK IL TRAINED SPOTTER ESTIMATED 60 TO 70 MPH WINDS. TIME ESTIMATED BY RADAR. 0340 PM TSTM WND DMG 1 ENE LAKEMOOR 42.33N 88.18W 08/10/2020 LAKE IL EMERGENCY MNGR 8-10 INCH DIAMETER LIMBS DOWNED IN THE VICINITY OF SULLIVAN LAKE ROAD AND GAME TRAIL. SOME BRANCHES WERE UP TO 20 FEET IN LENGTH. TIME ESTIMATED BY RADAR. 0340 PM TSTM WND DMG CARPENTERSVILLE 42.12N 88.26W 08/10/2020 KANE IL TRAINED SPOTTER TRAINED SPOTTER REPORTS NUMEROUS 6 INCH DIAMETER HEALTHY TREE LIMBS DOWN WITH SEVERAL WHOLE TREES UPROOTED. 0340 PM TSTM WND DMG 1 W ROSELLE 41.98N 88.10W 08/10/2020 DUPAGE IL PUBLIC PUBLIC REPORTS LARGE LIMBS DOWNED. TIME ESTIMATED BY RADAR. 0340 PM TSTM WND DMG OAK BROOK 41.83N 87.95W 08/10/2020 DUPAGE IL PUBLIC REPORT OF ESTIMATED WINDS UP TO 50MPH, SMALL BRANCHES DOWNED, AND HAIL TO HALF INCH DIAMETER. 0340 PM TSTM WND DMG 2 WNW DARIEN 41.76N 88.01W 08/10/2020 DUPAGE IL NWS EMPLOYEE CONSIDERABLE TREE DAMAGE ALONG MAIN ST NORTH OF 75TH STREET. 0341 PM TSTM WND GST 2 WNW LOCKPORT 41.60N 88.09W 08/10/2020 M58 MPH WILL IL OFFICIAL NWS OBS PEAK WIND GUST MEASURED AT NWS CHICAGO. SMALL TREE LIMBS OBSERVED FLYING PAST WINDOW AT TIME OF WIND GUST. 0343 PM TSTM WND DMG NEW LENOX 41.51N 87.97W 08/10/2020 WILL IL TRAINED SPOTTER NUMEROUS LARGE TREES UPROOTED. TIME ESTIMATED BY RADAR. 0343 PM HAIL 1 SSE GLEN ELLYN 41.86N 88.05W 08/10/2020 M1.00 INCH DUPAGE IL TRAINED SPOTTER TRAINED SPOTTER REPORTS QUARTER SIZED HAIL NEAR ROOSEVELT ROAD AND IL-53. 0345 PM FUNNEL CLOUD 1 NNE CREST HILL 41.57N 88.09W 08/10/2020 WILL IL TRAINED SPOTTER OBSERVED FROM NEAR CATON FARM ROAD AND IL-53. 0345 PM TSTM WND DMG 3 S NEW LENOX 41.47N 87.96W 08/10/2020 WILL IL PUBLIC NUMEROUS TRAFFIC SIGNALS AND A LARGE TREE DAMAGED NEAR DELANEY ROAD AND CEDAR ROAD. TIME ESTIMATED BY RADAR. 0346 PM TSTM WND DMG 2 S NEW LENOX 41.48N 87.97W 08/10/2020 WILL IL TRAINED SPOTTER TRAINED SPOTTER REPORTED HUNDREADS OF TREES SNAPPED AND UPROOTED ALONG CEDAR ROAD AND JOLIET HIGHWAY. 0348 PM TSTM WND GST MOKENA 41.53N 87.87W 08/10/2020 M65 MPH WILL IL TRAINED SPOTTER MEASURED WIND GUST. SMALL TREES DOWNED. TIME ESTIMATED BY RADAR. 0349 PM TSTM WND GST OHARE AIRPORT 41.98N 87.90W 08/10/2020 M62 MPH COOK IL ASOS OHARE ASOS PEAK GUST. 0350 PM TSTM WND DMG FRANKFORT 41.50N 87.85W 08/10/2020 WILL IL TRAINED SPOTTER SMALL TREES DOWN ACROSS TOWN, ALL IN THE SAME DIRECTION. TIME ESTIMATED BY RADAR. 0350 PM TSTM WND DMG 1 WNW DANFORTH 40.82N 88.00W 08/10/2020 IROQUOIS IL LAW ENFORCEMENT OVERTURNED SEMI TRAILER ON I-57 NEAR MILE MARKER 287. 0350 PM HAIL GLENCOE 42.13N 87.76W 08/10/2020 M0.88 INCH COOK IL PUBLIC NICKEL TO DIME SIZED HAIL REPORTED BY TRAINED SPOTTER IN GLENCOE. LASTED 10 MINUTES FROM 3:50 TO 4:00. 0350 PM TSTM WND DMG DUNNING - CHICAGO 41.94N 87.80W 08/10/2020 COOK IL PUBLIC GARAGE COLLAPSED. REPORTED AT NORDICA AND ROSCOE. 0352 PM TSTM WND DMG DUNNING - CHICAGO 41.94N 87.80W 08/10/2020 COOK IL PUBLIC SMALL GARAGE PARTIALLY COLLAPSED. TIME ESTIMATED BY RADAR. 0353 PM TSTM WND DMG KANKAKEE 41.12N 87.86W 08/10/2020 KANKAKEE IL EMERGENCY MNGR THE EMERGENCY MANAGER RELAYED REPORTS OF TREES UPROOTED ACROSS THE ENTIRE COUNTY. TIME ESTIMATED BY RADAR. 0353 PM TSTM WND DMG 1 SW GILMAN 40.75N 88.01W 08/10/2020 IROQUOIS IL TRAINED SPOTTER OVERTURNED SEMI AT MILEPOST 287 ON SOUTHBOUND I-57. TIME ESTIMATED BY RADAR. 0354 PM TORNADO 1 SW MIDLOTHIAN 41.62N 87.73W 08/10/2020 COOK IL NWS STORM SURVEY A TORNADO TOUCHED DOWN JUST EAST OF SOUTH HARLEM AVENUE IN OAK FOREST, THEN MOVED NEARLY DUE EAST ALONG 151ST STREET PRODUCING MAINLY MINOR TREE AND STRUCTURAL DAMAGE BEFORE LIFTING NEAR THE I-57/I-294 INTERCHANGE IN MIDLOTHIAN. THE WORST AND MOST CONCENTRATED DAMAGE THEN OCCURRED NEAR MIDLOTHIAN IN THE REGION BETWEEN CICERO AVENUE AND PULASKI ROAD. SEVERAL LARGE TREES AND POWER POLES WERE SNAPPED NEAR THEIR BASES IN THIS REGION, PRODUCING DAMAGE CONSISTENT WITH AN EF-1 TORNADO WITH WINDS OF UP TO 100 MPH. DAMAGE FELLED CONSISTENTLY IN A CONVERGENT PATTERN TOWARDS THE TRACK CENTERLINE. THE TORNADO DAMAGE THEN BEGAN TO TRANSITION TO A REGION OF ENHANCED STRAIGHT LINE WINDS NEAR THE I-57/294 INTERCHANGE WHERE THE DAMAGE BECAME INCREASINGLY ORIENTED IN AN EASTERLY DIRECTION. DOWNED UTILITY POLES AND SNAPPED TREES INDICATE WIND SPEEDS WERE LIKELY NEAR 90 MPH, WITH THE MOST NOTABLE DAMAGE CENTERED IN AND AROUND THE HARVEY AREA BOUNDED ON THE NORTH BY SIBLEY BOULEVARD AND THE SOUTH BY 159TH STREET. THIS HIGH DEGREE OF WIND DAMAGE PERSISTED EAST INTO THE SHABBONA WOODS FOREST PRESERVE BEFORE EASING TOWARDS CALUMET CITY. 0355 PM TSTM WND GST 2 N PAPINEAU 40.99N 87.71W 08/10/2020 M66 MPH IROQUOIS IL PUBLIC PRIVATE WEATHER STATION OBSERVED 66 MPH WIND GUST. 0355 PM TSTM WND GST 1 WSW BURBANK 41.74N 87.78W 08/10/2020 M65 MPH COOK IL CO-OP OBSERVER ALSO HAD PEA SIZE HAIL. 0357 PM TSTM WND DMG 1 SW ALBANY PARK - CHIC 41.96N 87.73W 08/10/2020 COOK IL TRAINED SPOTTER BRICKS KNOCKED OFF TOP OF BUILDING AND TREES DOWNED. TIME ESTIMATED BY RADAR. 0357 PM TSTM WND DMG OAK FOREST 41.60N 87.74W 08/10/2020 COOK IL PUBLIC 50 TO 60 FOOT TALL TREES DOWNED. TIME ESTIMATED BY RADAR. 0357 PM TORNADO PARK FOREST 41.48N 87.69W 08/10/2020 COOK IL NWS STORM SURVEY NWS STORM SURVEY DETERMINED THAT A BRIEF TORNADO TOUCHED DOWN VERY CLOSE TO THE COOK/WILL COUNTY LINE NEAR SHABBONA DRIVE. IT TRACKED NORTHEAST WHERE IT PRODUCED A LOCALIZED AREA OF FAIRLY WIDESPREAD TREE DAMAGE CONSISTENT WITH HIGH-END EF-0 WIND SPEEDS. THE WORST DAMAGE WAS CONFINED TO A SMALL AREA NEAR MARQUETTE AND SOMONAUK PARKS, ALTHOUGH VERY LITTLE STRUCTURAL DAMAGE WAS NOTED. THE TORNADO LIFTED OVER SCHUBERTS WOODS FOREST PRESERVE. SPORADIC STRAIGHT-LINE WIND DAMAGE OCCURRED EAST TOWARDS STATE STREET. 0357 PM TSTM WND DMG 1 SSE LINCOLN SQUARE - 41.97N 87.68W 08/10/2020 COOK IL PUBLIC REPORTED AT 2105 W EASTWOOD DR, CHICAGO, IL. LARGE TREE DOWN AND LARGE BRANCHES BROKEN OUT OF OTHER TREES. 0357 PM TSTM WND GST LINCOLN SQUARE - CHICAG 41.98N 87.69W 08/10/2020 M85 MPH COOK IL MESONET MEASURED BY WEATHERBUG STATION. 0357 PM TSTM WND GST 1 NE MIDWAY AIRPORT 41.79N 87.74W 08/10/2020 M72 MPH COOK IL ASOS MIDWAY ASOS PEAK GUST. 0357 PM TSTM WND DMG 1 S MONTROSE HARBOR 41.95N 87.64W 08/10/2020 COOK IL TRAINED SPOTTER REPORTS OF A ROOF BLOWN OFF A BUILDING NORTH OF ADDISON AND LAKE SHORE DRIVE. 0359 PM TORNADO 1 N WEST RIDGE - CHICAG 42.01N 87.70W 08/10/2020 COOK IL NWS STORM SURVEY AN NWS DAMAGE SURVEY CONFIRMED AN EF-1 TORNADO WITH ESTIMATED PEAK WINDS OF 110 MPH, PATH LENGTH OF 3 MILES, AND MAX WIDTH OF 300 YARDS TOUCHED DOWN NEAR CRAWFORD AVE IN THE LINCOLNWOOD NEIGHBROHOOD OF CHICAGO AND PROGRESSED EAST NORTHEASTWARD THROUGH PHILLIP ROGERS PARK. THE TORNADO THEN MOVED THROUGH POTTAWATTOMIE PARK AND ROUGHLY ALONG W FARGO AVE BEFORE CROSSING ONTO LAKE MICHIGAN. THERE WERE NO CONFIRMED INJURIES OR FATALITIES. 0359 PM TSTM WND DMG OAK LAWN 41.72N 87.75W 08/10/2020 COOK IL TRAINED SPOTTER LARGE TREE UPROOTED IN OAK LAWN. TIME ESTIMATED BY RADAR. 0400 PM TSTM WND DMG STEGER 41.47N 87.64W 08/10/2020 WILL IL EMERGENCY MNGR WIDESPREAD WIND DAMAGE THROUGHOUT STEGER INCLUDING TREES DOWN, TREES ON POWER LINES, AND POWER POLES BROKEN. 0400 PM TSTM WND DMG 4 ESE SAMMONS POINT 41.01N 87.79W 08/10/2020 KANKAKEE IL PUBLIC TREE DAMAGE NEAR 7500S ROAD WEST OF ST ANNE. TIME ESTIMATED BY RADAR. 0400 PM TSTM WND DMG CRESCENT CITY 40.77N 87.86W 08/10/2020 IROQUOIS IL TRAINED SPOTTER LARGE TREES AND POWER POLES DOWN ACROSS ENTIRE COUNTY. ALSO REPORTED BILLBOARD DAMAGE. TIME ESTIMATED BY RADAR. 0400 PM TSTM WND GST 4 SW CHANNAHON 41.40N 88.28W 08/10/2020 M57 MPH GRUNDY IL MESONET USACE STATION AT DRESDEN LOCK AND DAM OBSERVED 57 MPH GUST. 0400 PM TSTM WND DMG 1 W NAVY PIER 41.89N 87.62W 08/10/2020 COOK IL TRAINED SPOTTER NUMEROUS REPORTS OF DOWNED TREE LIMBS ACROSS WRIGLEYVILLE, ROSCOE VILLAGE, LOGAN SQUARE, AND LINCOLN SQUARE. TIME ESTIMATED BY RADAR. 0400 PM TSTM WND DMG 2 NNE BRIDGEPORT - CHIC 41.86N 87.64W 08/10/2020 COOK IL LAW ENFORCEMENT POSSIBLE STRUCTURE DAMAGE NEAR 18TH AND CANALPORT AVENUE IN CHICAGO. 0400 PM TSTM WND DMG 1 NW HARVEY 41.62N 87.66W 08/10/2020 COOK IL TRAINED SPOTTER EXTENSIVE DAMAGE TO TREES REPORTED IN THE AREA ALONG 149TH AND 150TH IN HARVEY, ESPECIALLY EAST OF DIXIE HWY. POSSIBLE TORNADO. 0400 PM TSTM WND GST 1 ENE HARVEY 41.61N 87.64W 08/10/2020 E90 MPH COOK IL NWS STORM SURVEY AN NWS STORM SURVEY DETERMINED A REGION OF ENHANCED STRAIGHT LINE WINDS OCCURRED IN AND AROUND THE HARVEY AREA. DOWNED UTILITY POLES AND SNAPPED TREES INDICATE WIND SPEEDS WERE LIKELY NEAR 90 MPH. THE WORST DAMAGE WAS BOUNDED ON THE NORTH BY SIBLEY BOULEVARD AND THE SOUTH BY 159TH STREET. THIS HIGH DEGREE OF WIND DAMAGE PERSISTED EAST INTO THE SHABBONA WOODS FOREST PRESERVE BEFORE EASING TOWARDS CALUMET CITY. 0402 PM MARINE TSTM WIND 1 NE MONTROSE HARBOR 41.97N 87.63W 08/10/2020 M80 MPH LMZ741 IL MESONET MESONET STATION XMTB MONTROSE BEACH. 0402 PM MARINE TSTM WIND 3 NE NAVY PIER 41.92N 87.57W 08/10/2020 M72 MPH LMZ741 IL C-MAN STATION HARRISON DEVER CRIB MEASURED A 63 KT WIND GUST. 0402 PM TSTM WND DMG CHICAGO HEIGHTS 41.51N 87.64W 08/10/2020 COOK IL PUBLIC 45 FOOT PINE TREE DOWNED. TIME ESTIMATED BY RADAR. 0403 PM TSTM WND DMG EVANSTON 42.04N 87.69W 08/10/2020 COOK IL TRAINED SPOTTER NUMEROUS TREES SNAPPED AND UPROOTED IN EVANSTON. TIME ESTIMATED BY RADAR. 0403 PM TSTM WND DMG LAKEVIEW - CHICAGO 41.94N 87.66W 08/10/2020 COOK IL PUBLIC LARGE TREE SNAPPED. TIME ESTIMATED BY RADAR. 0404 PM WATER SPOUT 1 NE ROGERS PARK - CHIC 42.02N 87.66W 08/10/2020 LMZ741 IL PUBLIC YOUTUBE VIDEO SHOWS FOOTAGE OF A TORNADO IN ROGERS PARK MOVING OUT OVER LAKE MICHIGAN AS A WATERSPOUT. 0404 PM TORNADO GRANT PARK 41.24N 87.65W 08/10/2020 KANKAKEE IL NWS STORM SURVEY AN EF-0 TORNADO WITH PATH LENGTH OF 1.5 MILES, MAX WIDTH 250 YARDS, AND PEAK WINDS OF 80 MPH STARTED JUST NORTHWEST OF GRANT PARK ON N 11000 E ROAD, TRAVELED SOUTHEAST THROUGH GRANT PARK, AND ENDED NEAR LAKE METONGA. DAMAGE WAS MAINLY TO TREES ALONG THE DAMAGE PATH. 0405 PM TSTM WND DMG GRANT PARK 41.24N 87.64W 08/10/2020 KANKAKEE IL TRAINED SPOTTER LARGE TREES DOWNED. TIME ESTIMATED BY RADAR. 0405 PM TSTM WND GST 1 NE PARK FOREST 41.49N 87.68W 08/10/2020 M70 MPH COOK IL AMATEUR RADIO MEASURED WIND GUST OF 72 MPH NEAR FIR STREET RELAYED VIA AMATEUR RADIO. 0408 PM TSTM WND DMG ST. JOHN 41.45N 87.47W 08/10/2020 LAKE IN PUBLIC SEVERAL TREES SNAPPED. 0408 PM TSTM WND GST 1 SE THORNTON 41.57N 87.61W 08/10/2020 E60 MPH COOK IL TRAINED SPOTTER TRAINED SPOTTER ESTIMATES WINDS OF 60 MPH IN THORNTON. RELAYED VIA AMATEUR RADIO. 0408 PM TSTM WND GST WEST RIDGE - CHICAGO 42.00N 87.69W 08/10/2020 M57 MPH COOK IL PUBLIC PRIVATE WEATHER STATION OBSERVED 57MPH GUST IN WEST RIDGE NEIGHBORHOOD OF CHICAGO. 0409 PM TSTM WND DMG 1 NW CICERO 41.86N 87.77W 08/10/2020 COOK IL PUBLIC PUBLIC REPORT OF TREE DAMAGE IN CICERO. 0410 PM TSTM WND DMG 1 NW LOGAN SQUARE - CHI 41.93N 87.71W 08/10/2020 COOK IL LAW ENFORCEMENT TREE BLOCKING KEZIE BLVD AT LOGAN BLVD IN LOGAN SQUARE NEIGHBORHOOD OF CHICAGO. 0415 PM TORNADO 4 WSW BROOK 40.85N 87.43W 08/10/2020 NEWTON IN EMERGENCY MNGR THIS EF-0 TORNADO WAS ON THE GROUND FOR LESS THAN 1 MINUTE AND PRODUCED MINOR DAMAGE TO A METAL FARM BUILDING IMMEDIATELY WEST OF STATE HIGHWAY 41. 0415 PM TSTM WND GST 1 SW HAMMOND 41.57N 87.51W 08/10/2020 M61 MPH LAKE IN PUBLIC PRIVATE WEATHER STATION OBSERVED 61 MPH GUST. 0415 PM TSTM WND DMG 1 WSW CEDAR LAKE 41.36N 87.45W 08/10/2020 LAKE IN PUBLIC 6 INCH DIAMETER TREE DOWNED NEAR PARRISH AVENUE AND 141ST AVENUE IN CEDAR LAKE. TIME ESTIMATED BY RADAR. 0416 PM TSTM WND GST GARY AIRPORT 41.62N 87.41W 08/10/2020 M55 MPH LAKE IN AWOS GARY AWOS PEAK GUST. 0416 PM TSTM WND DMG CROWN POINT 41.42N 87.36W 08/10/2020 LAKE IN PUBLIC LARGE TREE SNAPPED. TIME ESTIMATED BY RADAR. 0418 PM TSTM WND GST 1 ESE NAPERVILLE 41.77N 88.14W 08/10/2020 E60 MPH DUPAGE IL BROADCAST MEDIA 0420 PM TSTM WND DMG 4 W BROOK 40.87N 87.43W 08/10/2020 NEWTON IN LAW ENFORCEMENT POWERLINES DOWN ACROSS US-41 NEAR IN-16 BETWEEN MOROCCO AND KENTLAND. TIME ESTIMATED BY RADAR. 0421 PM TSTM WND DMG 4 N KENTLAND 40.83N 87.43W 08/10/2020 NEWTON IN EMERGENCY MNGR 30 BY 50 FOOT CORN FIELD FLATTENED WITH SWILING DENOTED IN CORNFALL. ALSO, METAL SHEDS DAMAGED WITH PARTS OF ROOFS AND DOORS MISSING. NO MAJOR STRUCTURE DAMAGE WAS NOTED TO FARM HOUSES IN THE AREA. POSSIBLE TORNADO. TIME ESTIMATED BY RADAR. 0421 PM TSTM WND DMG MOROCCO 40.95N 87.45W 08/10/2020 NEWTON IN PUBLIC BRICK CHIMNEY BLOWN DOWN; MULTIPLE TREE LIMBS BLOWN DOWN. TIME ESTIMATED BY RADAR. 0425 PM TSTM WND GST 5 WNW KENTLAND 40.80N 87.53W 08/10/2020 M73 MPH NEWTON IN PUBLIC PRIVATE WEATHER STATION OBSERVED 73 MPH GUST WEST OF KENTLAND. TIME ESTIMATED BY RADAR. 0425 PM NON-TSTM WND GST 1 W ELMHURST 41.90N 87.95W 08/10/2020 M57 MPH DUPAGE IL MESONET PRIVATE WEATHER STATION OBSERVED 57 MPH GUST. 0429 PM TSTM WND GST 1 NNW WINFIELD 41.42N 87.28W 08/10/2020 M60 MPH LAKE IN PUBLIC PRIVATE WEATHER STATION RECORDED 60 MPH GUST. 0431 PM TSTM WND DMG 3 ESE WHEELER 41.50N 87.12W 08/10/2020 PORTER IN TRAINED SPOTTER DOWNED TREES AND TRAMPOLINE THROWN ACROSS YARD. 0432 PM TSTM WND DMG 3 SW VALPARAISO 41.45N 87.10W 08/10/2020 PORTER IN TRAINED SPOTTER FOUR 8 TO 10 INCH IN DIAMETER SNAPPED. 0439 PM TSTM WND GST KOUTS 41.32N 87.03W 08/10/2020 E70 MPH PORTER IN TRAINED SPOTTER ESTIMATED 70 MPH WIND GUSTS. TIME ESTIMATED BY RADAR. 0440 PM TSTM WND DMG PORTAGE 41.58N 87.18W 08/10/2020 PORTER IN EMERGENCY MNGR DAMAGE TO THE ROOF OF A STRIP MALL ALONG CENTRAL AVENUE IN PORTAGE. TIME ESTIMATED BY RADAR. 0440 PM TSTM WND DMG 1 S PORTAGE 41.56N 87.18W 08/10/2020 PORTER IN TRAINED SPOTTER TRAINED SPOTTER REPORTS 10 INCH DIAMETER BRANCH DOWNED ON LUTE ROAD IN PORTAGE. TIME ESTIMATED BY RADAR. 0441 PM TSTM WND DMG 1 S VALPARAISO 41.46N 87.06W 08/10/2020 PORTER IN TRAINED SPOTTER SEMI BLOWN OVER NEAR VALPARAISO. TIME ESTIMATED BY RADAR. 0456 PM MARINE TSTM WIND 3 NE NAVY PIER 41.92N 87.57W 08/10/2020 M55 MPH LMZ741 IL C-MAN STATION **DELAYED REPORT** RECORDED AT THE HARRISON-DEVER CRIB. GUSTS ABOVE 35 MPH CONTINUED UNTIL 5:18 PM CDT.
Tornadoes:
As of Saturday, August 15, there have been 15 tornadoes confirmed across northern Illinois and northwest Indiana.
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Full Public Information Statement on the tornadoes
Downloadable KMZ file featuring all tornado paths and wind swaths/damage
Downloadable shapefile featuring all tornado paths and wind swaths/damage
Tornadoes are listed in chronological order:
Tornado #1: Southwest Rockford, IL EF-0
Summary: A very brief tornado touched down near the intersection of Pierpont Ave and Montague Road and continued northeast into the southwest side of Rockford. The tornado ended near the intersection of Ferguson and Loomis Streets. All damage was to trees along the tornado path. |
Tornado #2 - Rockford to Caledonia, IL EF-1
Summary: This tornado was associated with the same supercell thunderstorm that produced an initial brief EF-0 tornado immediately southwest of Rockford, but it has been determined these exist as two separate tracks. This tornado developed as the main line of thunderstorms caught up, and eventually merged with, the parent supercell with this path starting near Guilford Road just north of Rockford College before heading northeast. Significant tree damage, consistent with EF-1 wind speeds, occurred in a localized area immediately east of Rock Valley College west of North Perryville Road. The tornado continued northeast, crossing I-90/39, producing sporadic damage before lifting near Caledonia Road. |
Tornado #3 - Kirkland, IL EF-0
Summary: Drone footage shared with NWS Chicago as well as satellite imagery revealed a narrow swath of corn flattened in a convergent pattern. This tornado crossed Buck Road and Pearl Street before lifting in a field east of Myelle Road. |
Tornado #4 - Ottawa, IL EF-1
Summary: The tornado started south of Marquette Street west of Michigan Street and progressed eastward. The tornado impacted several businesses ripping off well-anchored roofing material and snapping a power pole at its base. It was here that the max intensity of the tornado was reached with peak winds of around 100 mph. The tornado then continued eastward ripping shingles off roofs of buildings and houses just west of Route 23 and shredding trees. The tornado is believed to have lifted in an inaccessible forested area east of the Fox river. Eye witnesses indicated the tornado may have had multiple vortices with clear rising and rotating motion of debris. |
Tornado #5 - Southeast Marengo, IL EF-1
Summary: This EF-1 tornado started on Harmony Road immediately southwest of I-90 near the McHenry/DeKalb County line. Tree damage consistent with winds around 95 mph occurred immediately northeast of I-90. The tornado heavily damaged a single family home near Maple Street before heading northeast and lifting near Coral and Dunham Roads. |
Tornado #6 - Northwest Elburn, IL EF-1
Summary: Drone footage shared with NWS Chicago reveals a narrow swath of corn flattened in a convergent pattern. In addition, damage to a barn was noted, with a near complete removal of the gabled roof. This damage is consistent with a tornado with winds of EF-1 intensity. |
Tornado #7 - Yorkville to South Plainfield EF-1 |
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Summary: The tornado started on the far south side of Yorkville near Walsh Drive where a pergola was destroyed, siding was ripped off a house, and parts of a fence and a tree were thrown over a roadway. Eyewitnesses accounts indicate the debris was lifted and twirled, consistent with a tornado. The tornado then progressed east-southeastward producing damage to trees along State Route 126 toward Schlapp Road. The most significant damage was found east of Schlapp Road along Wheeler road where trees were mangled, a farm building was destroyed with debris deposited in a nearby field, and a large grain bin was bent inward. Wood panels were thrown into the ground leaving scour marks in the grass. Six power poles were snapped along Ridge Road, and a 1000-1500 lb auger was moved about 50 feet. This is where the tornado likely reached peak intensity with winds near 105 mph. The tornado continued southeast into neighborhoods south of Renwick Road producing mainly tree damage, and ended just before I-55. A swath of damaging winds consistent with speeds of 70 to 80 mph continued into Crest Hill based on prolific tree damage. |
Tornado #8 - Wheaton, IL EF-1
Summary: A very brief tornado touched down near the intersection of Seminary Avenue and Scott Street before moving northeast where it knocked a roughly 50 foot steeple around to the north side of the College Church in Wheaton. The tornado then produced minor tree damage before lifting near College Avenue and Howard Street. |
Tornado #9 - Lombard/Villa Park, IL EF-1
Summary: The same storm which produced the brief Wheaton tornado produced another region of tornado damage immediately east of I-355 just east of Lilacia Park. This tornado also continued in a northeasterly direction, uprooting trees--some snapped at the trunk--as well as causing some house damage including a few with substantial roof damage. The worst damage occurred near and around the Lombard Common just south of St. Charles Road. Damage eased considerably on the north side of the circulation, with a more gradual drop off in damage to its south. The tornado lifted just northeast of the Jefferson Middle School. |
Tornado #10 - Spring Grove, IL to Camp Lake, WI EF-1
Summary: This tornado started in northwest Lake County, continued into Wisconsin and through Camp Lake, and appeared to dissipate over the lake in NWS Milwaukee's area of responsibility. Mainly tree damage occurred with the most significant structural damage occurring in northwestern Lake County. |
Tornado #11 - Oak Forest-Midlothian, IL EF-1
Summary: A tornado touched down just east of South Harlem Avenue in Oak Forest, then moved nearly due east along 151st Street producing mainly minor tree and structural damage before lifting near the I-57/I-294 interchange in Midlothian. The worst and most concentrated damage then occurred near Midlothian in the region between Cicero Avenue and Pulaski Road. Several large trees and power poles were snapped near their bases in this region, producing damage consistent with an EF-1 tornado. Damage felled consistently in a convergent pattern towards the track centerline. The tornado damage then began to transition to a region of enhanced straight line winds near the I-57/294 interchange where the damage became increasingly oriented in an easterly direction. Downed utility poles and snapped trees indicate wind speeds were likely near 90 mph, with the most notable damage centered in and around the Harvey area bounded on the north by Sibley Boulevard and the south by 159th Street. This high degree of wind damage persisted east into the Shabbona Woods Forest Preserve before easing towards Calumet City. |
Tornado #12 - Park Forest, IL EF-0
Summary: A brief tornado touched down very close to the Cook/Will county line near Shabbona Drive. It tracked northeast where it produced a localized area of tree damage consistent with high-end EF-0 wind speeds. The worst damage was confined to a small area near Marquette and Somonauk Parks, although very little structural damage was noted in this area. The tornado lifted over Schubert's Woods Forest Preserve. Sporadic straight-line wind damage continued east towards State Street east of South Chicago Heights. |
Tornado #13 - Rogers Park, IL EF-1
Summary: This tornado initially touched down south of the intersection of Crawford and Touhy Avenues in the suburb of Lincolnwood. It then continued moving just north of due east before moving offshore near the Jarvis and Fargo beaches. The most intense damage, consistent with that of a high-end EF-1 tornado, occurred within approximately one mile of the lakefront, as well as near and within Phillip Rogers Park. |
Tornado #14 - Grant Park, IL
Summary: An EF-0 tornado touched down just northwest of Grant Park along N 11000 E Road and traveled southeast through Grant Park. Considerable tree damage was found along the path. The tornado ended near Lake Metonga. |
Tornado #15 - Kentland, IN Area
Summary: This brief EF-0 tornado was on the ground for less than 1 minute and produced minor damage to a metal farm building immediately west of State Highway 41. |
The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Radar:
Loops
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Composite radar (highest intensity within the column) of derecho across northern Illinois courtesy of NWS Milwaukee. | Lowest level radar scans of derecho across northern Illinois. |
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Summary of the radar presentation during severe wind damage in Harvey, IL in southern Cook County. |
Photos:
Approaching Derecho
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Shelf cloud 2 miles west of Mendota, IL courtesy of Heather Friedlein | Shelf cloud near Lisle, IL courtesy of Keith Langosch | Shelf cloud from near Sugar Grove, IL courtesy of Maddie Murphy. |
Tornadoes
Ottawa, IL tornado courtesy of Jason Ward. |
Storm Damage
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Kendall County to Will County tornado - NWS Survey | Kendall County to Will County tornado - NWS Survey | Kendall County to Will County tornado - NWS Survey | Kendall County to Will County tornado - NWS Survey |
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Elburn, IL, courtesy of Matt Taylor | Midlothian, IL, courtesy of Matt Kooi |
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Ottawa, IL courtesy of Matthew Spika | Ottawa, IL courtesy of Gilbert Sebenste | Wheaton, IL church steeple damage courtesy of Carrie Vicek-Jodelka |
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Somonauk, IL courtesy of Bob Waszak | Chicago, Albany Park neighborhood, courtesy of Alex Forgue | Chicago, Rogers Park neighborhood, courtesy of Paul Navarro | Chicago, Dunning neighborhood area, courtesy of Twitter follower @Jasong1451 |
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New Lenox, IL courtesy of the Joliet Weather Center | New Lenox, IL courtesy of Dan Casper | Dwight, IL courtesy of Andrew Pritchard |
Environment
Aug 10, 9 a.m. 500 mb (~18,000 ft) level, showing a strong short wave and associated 50-70 kt speed maximum moving eastward across the Upper Midwest. This would be a drive force for continued upper support through the thunderstorm complex's lifecycle. | Aug 10, 9 a.m. surface weather map highlighting the very moist air mass ahead of the maturing thunderstorm complex at that time. Note the warm front also slowly moving north. This boundary supported continued low-level warm and moist advection (fuel to the storms), as well as a source for low-level veering profiles near it increasing tornadogenesis potential especially in the toward the IL/WI state line by mid afternoon. |
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NWS Quad Cities weather balloon launch at 12 p.m. on August 10 that sampled a high amount of instability thanks to exceptionally steep mid-level lapse rates and very high equilibrium levels, ample moisture, and undirectional mid-level flow of sufficient amount for long-lived, organized, forward-propagating storms. |
Aug 10, 11 a.m. deep layer wind shear, with values of 40+ kt sufficient for storm organization, and given the unidirectional mid-level wind profile, this also would help support the development of a forward-propagating storm complex. | Aug 10, 11 a.m. surface-based CAPE (instability), with widespread values over 2,500 J/kg indicating a strongly unstable air mass ahead of the incoming thunderstorm complex. | Aug 10, 11 a.m. precipitable water, with an ample moisture reservoir present for the replenishing of moisture into the thunderstorm complex. |
Aug 10, 11 a.m. mid-level lapse rates with 8C/km or higher through that layer reflecting the potential for rapidly accelerating updrafts. Combined with sufficient low-level moisture and heating, this indicates explosive convection processes. | Aug 10, 11 a.m. low-level wind shear with values of 20-25 kt (that likely increased further as the complex strengthened) indicating cold pool organization from rain-cooled air. A cold pool allows for stronger storm forward motion and wind momentum given the other ingredients. Also these values are sufficient enough for tornado potential if defined storm inflow areas that can harness low-level turning were to develop. | Aug 10, 11 a.m. MCS maintenance parameter, which provides probabilistic information combining shear profile data, mid-level lapse rates, instability, and mid and upper level wind flow. High probabilities of 90+ percent for ~200 miles ahead of the maturing storm complex are not surprising given the high values of these input parameters. |
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NWS Des Moines Doppler Radar Vertical Wind Profile data (separate tab for full resolution) | NWS Quad Cities Doppler Radar Vertical Wind Profile data (separate tab for full resolution) | NWS Chicago/Romeoville Doppler Radar Vertical Wind Profile data (separate tab for full resolution) |
These are basically cross-sections of the derecho's wind profile, namely its rear-inflow jet (RIJ), as the system moved from west-to-east over the area. The RIJ is most mature as the system moves over the Quad Cities, with impressive 100+ mph winds immediately off the surface (some realized at the surface). Notice the unidirectional northwest flow of the low-level jet, ideal for momentum transfer of the strongest winds to the surface that was realized with frequent severe wind gusts persisting a half hour in places! Also interesting to note is the wind profile immediately ahead of the front edge of the derecho's front edge (i.e. the wind shift). For the NWS Chicago profile data, there is more low-level shear (~0-1.5 km) in that immediate pre-storm environment which may explain the tendency for more mesovortices and in turn corridors of enhanced wind damage and tornadoes in our area vs. further west. |
Click image for 14-hour satellite loop of the derecho shared on Twitter. |
Rain Reports
Public Information Statement National Weather Service Chicago IL 1103 PM CDT Tue Aug 11 2020 /1203 AM EDT Wed Aug 12 2020/ ...Rainfall from Monday August 10th... The following are rainfall amounts as measured in the morning by NWS Cooperative observers and CoCoRaHS observers. Observations are usually taken at 7 AM. ILLINOIS Rainfall Location (County): Amt(inches) South Beloit 2SE (Winnebago).................2.66 Roscoe 2se (Winnebago).......................2.48 Roscoe 2ESE (Winnebago)......................2.48 Capron (Boone)...............................2.46 Rockford 2ENE (Winnebago)....................1.30 Hebron (McHenry).............................1.22 Lake Villa 1SSW (Lake).......................1.00 Woodstock 5nw (McHenry)......................0.98 Brandon Road Lock & Dam (Will)...............0.94 Lake Villa 2WSW (Lake).......................0.92 Gurnee 2W (Lake).............................0.91 Woodstock 4SW (McHenry)......................0.87 Oregon (Ogle)................................0.85 Bull Valley 2WNW (McHenry)...................0.83 Kingston 2WNW (De Kalb)......................0.82 New Lenox 3ENE (Will)........................0.75 Morris 6ESE (Grundy).........................0.75 McHenry (Stratton Lock & Dam) (McHenry)......0.74 Winthrop Harbor (Lake).......................0.74 New Lenox 3E (Will)..........................0.73 Mokena 1W (Will).............................0.73 Woodstock 1SSW (McHenry).....................0.73 Lakemoor 2NW (McHenry).......................0.73 Channahon 2SSE (Will)........................0.72 Winthrop Harbor 1SSW (Lake)..................0.72 Midlothian (Cook)............................0.72 Carbon Hill 3.1N (Grundy)....................0.71 Genoa (De Kalb)..............................0.71 Coal City 4NNW (Grundy)......................0.71 Beecher 3ENE (Will)..........................0.70 Glen Ellyn 2SSE (Du Page)....................0.70 Bourbonnais (Kankakee).......................0.70 Plainfield 2SSE (Will).......................0.69 Lake Forest 2NNE (Lake)......................0.69 Manhattan 2SE (Will).........................0.68 Round Lake 2WNW (Lake).......................0.68 Elwood 5NE (Will)............................0.67 Lockport 1SE (Will)..........................0.66 Plainfield 3ESE (Will).......................0.66 Aurora 4SE (Du Page).........................0.66 Oak Park 2S (Cook)...........................0.66 Elmhurst 1ESE (Du Page)......................0.64 Wilmington 6NW (Will)........................0.63 Naperville 4SSW (Will).......................0.63 Wilmington 3SE (Will)........................0.63 Morris 2SSE (Grundy).........................0.63 Aurora 4SE (Du Page).........................0.63 La Grange Park 1SSW (Cook)...................0.63 Crystal Lake 1WSW (McHenry)..................0.62 La Salle (La Salle)..........................0.62 Naperville 2SE (Du Page).....................0.62 Oak Park 1SW (Cook)..........................0.62 Oak Lawn 2SE (Cook)..........................0.62 DeKalb (De Kalb).............................0.62 Joliet 2n (Will).............................0.61 Crete 3E (Will)..............................0.61 Plano (Kendall)..............................0.61 Huntley (McHenry)............................0.59 Naperville 2ESE (Du Page)....................0.59 Peru 1ENE (La Salle).........................0.58 De Kalb 1SW (De Kalb)........................0.58 Oswego 5SSE (Kendall)........................0.57 Waukegan (Lake)..............................0.56 Steward (Lee)................................0.56 Pontiac (Livingston).........................0.56 Algonquin 1N (McHenry).......................0.56 Beecher 3SSE (Will)..........................0.55 Westmont 1SSW (Du Page)......................0.55 Oak Forest 1SSE (Cook).......................0.55 Joliet 3WNW (Will)...........................0.54 Cary (McHenry)...............................0.54 Emington 2SSE (Livingston)...................0.54 Somonauk 2NE (De Kalb).......................0.54 Naperville 2ESE (Du Page)....................0.53 Seneca 1NNE (La Salle).......................0.52 Gilberts (Kane)..............................0.52 Cortland (De Kalb)...........................0.52 Glen Ellyn (Du Page).........................0.52 Lisle Morton Arb (Du Page)...................0.51 Rockford (Winnebago).........................0.51 Peru 1SW (La Salle)..........................0.51 Gibson 3WNW (Ford)...........................0.51 Elmhurst 2SE (Du Page).......................0.51 Oak Lawn (Cook)..............................0.51 Morris (Grundy)..............................0.50 Elgin (Kane).................................0.50 Park Forest 1NNE (Cook)......................0.49 Rogers Park 2SW (Cook).......................0.49 Chicago Ridge (Cook).........................0.49 Waukegan 2N (Lake)...........................0.48 Dixon 3NNW (Lee).............................0.48 Elgin 2W (Kane)..............................0.48 Coal City 3N (Grundy)........................0.48 Homewood (Cook)..............................0.48 Park Forest (Cook)...........................0.47 Paw Paw (Lee)................................0.47 Watseka 6.9WNW (Iroquois)....................0.47 Morris 5NNW (Grundy).........................0.47 Naperville 1NW (Du Page).....................0.47 Westmont (Du Page)...........................0.46 Mundelein (Lake).............................0.46 Elgin 2WNW (Kane)............................0.46 Glencoe (Cook)...............................0.46 Winnetka 1ESE (Cook).........................0.46 Aurora (Kane)................................0.46 Romeoville (Will)............................0.45 Lake Zurich 1N (Lake)........................0.45 Riverwoods (Lake)............................0.44 Ashton (Lee).................................0.44 Sugar Grove 1NE (Kane).......................0.44 Buckley (Iroquois)...........................0.44 Ashkum 5.6E (Iroquois).......................0.44 Bolingbrook 3NE (Du Page)....................0.44 Peotone (Will)...............................0.43 Channahon 1NNE (Will)........................0.43 Peotone (Will)...............................0.43 Sugar Grove 1ENE (Kane)......................0.43 Morris (Grundy)..............................0.43 Lansing (Cook)...............................0.42 Mendota (La Salle)...........................0.42 Geneva 1SSW (Kane)...........................0.42 Lincolnwood 2E (Cook)........................0.42 O`hare Airport (Cook)........................0.41 Mendota (La Salle)...........................0.41 Mundelein (Lake).............................0.41 Batavia 1WNW (Kane)..........................0.41 Batavia 1WSW (Kane)..........................0.40 Minooka (Grundy).............................0.40 Elk Grove Village 2WSW (Cook)................0.40 Lemont (Cook)................................0.40 Chatsworth (Livingston)......................0.40 Bannockburn (Lake)...........................0.39 North Aurora 2NE (Kane)......................0.39 Geneva 4WSW (Kane)...........................0.39 Montgomery 1SSE (Kendall)....................0.39 Lisle (Du Page)..............................0.39 Highwood 1S (Lake)...........................0.38 Batavia 2WNW (Kane)..........................0.38 Lisle 1SE (Du Page)..........................0.38 Oak Park 1NNE (Cook).........................0.38 Oak Lawn 1N (Cook)...........................0.38 Roselle 1ESE (Du Page).......................0.37 Dwight (Livingston)..........................0.37 Homer Glen 1ENE (Will).......................0.36 Pontiac 1SE (Livingston).....................0.36 North Utica 6N (La Salle)....................0.36 Libertyville 2ESE (Lake).....................0.36 Darien (Du Page).............................0.36 Earlville 5NNE (De Kalb).....................0.36 Mount Prospect 3NE (Cook)....................0.36 Batavia (Kane)...............................0.36 Paxton (Ford)................................0.35 Ottawa 2N (La Salle).........................0.35 Lake Bluff 1W (Lake).........................0.35 St. Charles 6NW (Kane).......................0.35 St. Charles (Kane)...........................0.35 Midway Coop (Cook)...........................0.34 Lisle 1SW (Du Page)..........................0.34 Palatine 1NNE (Cook).........................0.34 Lake Zurich (Lake)...........................0.33 Buffalo Grove 2N (Lake)......................0.33 Herscher 3E (Kankakee).......................0.33 Plainfield 5SW (Kendall).....................0.33 Earlville 3S (La Salle)......................0.33 Schaumburg (Du Page).........................0.33 Wheeling (Cook)..............................0.32 Midway (Cook)................................0.32 Coal City (Grundy)...........................0.32 Gibson 6NE (Ford)............................0.32 Burr Ridge 2SW (Du Page).....................0.32 Bartlett 1SE (Du Page).......................0.32 Wheaton 2NNE (Du Page).......................0.31 Elk Grove Village 1ESE (Cook)................0.31 Elmwood Park 1ESE (Cook).....................0.31 West Chicago (Du Page).......................0.31 Ottawa (La Salle)............................0.30 Lombard 1NNW (Du Page).......................0.30 Elmhurst (Du Page)...........................0.30 Marseilles 5WNW (La Salle)...................0.29 Arlington Heights 1S (Cook)..................0.28 Hoffman Estates 5W (Cook)....................0.28 Lincolnshire 1N (Lake).......................0.27 Harwood Heights (Cook).......................0.27 Ottawa 1NW (La Salle)........................0.25 Palos Park 1SW (Cook)........................0.25 St Anne (Kankakee)...........................0.24 Paxton (Ford)................................0.24 Bridgeview 1NNW (Cook).......................0.24 Ottawa (La Salle)............................0.23 Schaumburg 2E (Cook).........................0.23 Cissna Park 1S (Iroquois)....................0.22 Park Ridge (Cook)............................0.22 Cropsey 1NE (Livingston).....................0.21 Hoffman Estates 2SE (Cook)...................0.21 Park Ridge 1WNW (Cook).......................0.20 Streator (Livingston)........................0.18 INDIANA Rainfall Location (County): Amt(inches) Hebron 1NW (Porter)..........................1.34 Hebron 3SW (Lake)............................1.24 Remington (Jasper)...........................1.15 Lakes Of The Four Seasons (Porter)...........0.94 Wheatfield 5W (Jasper).......................0.94 Wheatfield 3S (Jasper).......................0.88 Rensselaer 5NW (Jasper)......................0.84 Mount Ayr 2NNE (Newton)......................0.80 Hebron 4NE (Porter)..........................0.74 Rensselaer (Jasper)..........................0.70 Rensselaer 2N (Jasper).......................0.69 De Motte 1NNW (Jasper).......................0.69 Rensselaer 2SSW (Jasper).....................0.69 Crown Point (Lake)...........................0.68 Crown Point 1N (Lake)........................0.67 Rensselaer 4N (Jasper).......................0.64 De Motte 1SW (Jasper)........................0.64 De Motte 6S (Jasper).........................0.64 De Motte 1SSW (Jasper).......................0.62 Rensselaer 10NNE (Jasper)....................0.61 Wheatfield 4WSW (Jasper).....................0.59 Rensselaer 8ENE (Jasper).....................0.59 Porter 1S (Porter)...........................0.54 Valparaiso 4SW (Porter)......................0.50 Valparaiso 2N (Porter).......................0.49 Portage 3E (Porter)..........................0.48 Hammond 1SSW (Lake)..........................0.46 Valparaiso 2NW (Porter)......................0.43 Chesterton 1ENE (Porter).....................0.42 Kentland 2SSE (Newton).......................0.42 Rensselaer 6SE (Jasper)......................0.41 Indiana Dunes (Porter).......................0.41 Schererville 2ESE (Lake).....................0.38 Hobart 2E (Lake).............................0.37 Hobart 1SSW (Lake)...........................0.36 Kentland (Newton)............................0.35 Chesterton 4E (Porter).......................0.34 Gary 5ENE (Lake).............................0.33 Valparaiso 6SSW (Porter).....................0.30 Schererville 1E (Lake).......................0.29 Munster 2NNW (Lake)..........................0.27 Schererville 1E (Lake).......................0.27 Griffith 1N (Lake)...........................0.26 St. John (Lake)..............................0.25 Dyer 1WNW (Lake).............................0.23
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