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The events of Friday, May 30, 2008, spanned from strong winds not related to thunderstorms, to large hailstones, to heavy rainfall and flooding, and to strong winds that were related to thunderstorms. The following is a map of all reports received by the NWS office in Romeoville on Friday.
The morning started off with a Tornado Watch across a portion of western Illinois into the Chicagoland area. No tornadoes occurred, but a wake low did develop off of a line of storms that traveled across Iowa and eventually weakened in Illinois. This wake low tracked along the Wisconsin/Illinois border through mid to late morning and produced sustained winds of 45 to 55 mph for up to a half hour at some locations, with gusts reported up to 65 mph. These strong winds caused tree damage and power outages, mainly across far northern Illinois. These winds also may have capsized a 37ft charter boat on Lake Michigan in which everyone fortunately was rescued. Here is a depiction of surface map from Friday morning showing the wake low near Rockford.
The following two images from the Doppler radar in Romeoville show the effects of the wake low near Waukegan. The first image depicts the strong wind velocities (> 80+ mph just above the surface) while the second shows the arcing band of rain left over after the earlier thunderstorms.
 
After this wake low came through, the attention then shifted to an evolving severe weather threat across central Illinois and northwest Indiana in an airmass less affected by the earlier convection. Storms developed in the late afternoon and brought large hail, strong winds, and heavy rain from Grundy County down to Ford County and eastward into Indiana. Ping pong to tennis ball sized hail was reported from a storm that went through Manteno in Kankakee County. Two semi-trailers were overturned, one on Interstate 57 near Paxton in Ford County and another on Interstate 55 near Braidwood in Will County. Here is another radar image showing the strong thunderstorm that produced the tennis ball sized hail in Manteno. The first image shows the reflectivity while the second shows the Vertically Integrated Liquid (VIL). With VIL values at the highest end of the spectrum, especially for a storm fairly close to the radar, it is no surprise that such large hail was reported.
 As these storms started to develop and track over the same areas, flooding became the main concern as flood advisories and flash flood warnings were issued. Doppler radar estimates and spotter reports showed that about 3 to 6 inches of rain fell along a band from Iroquois County eastward into northern Benton County, where some roads remained closed as of Saturday morning.
Here is a listing of all the storm reports from Friday:
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1059 PM CDT FRI MAY 30 2008 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 1015 AM NON-TSTM WND DMG 3 E ROCKFORD 42.27N 89.00W 05/30/2008 WINNEBAGO IL TRAINED SPOTTER LARGE TREE DOWN ACROSS WOODLAND DRIVE. 1015 AM NON-TSTM WND GST ROCKFORD AIRPORT 42.20N 89.10W 05/30/2008 M63.00 MPH WINNEBAGO IL ASOS MEASURED WINDS HAVE BEEN CONTINUOUSLY BETWEEN 45 AND 55 KNOTS FOR OVER 15 MINUTES NOW. EVENT CONTINUES AS OF 1033 AM CDT. 1015 AM NON-TSTM WND DMG ROCKFORD 42.27N 89.06W 05/30/2008 WINNEBAGO IL EMERGENCY MNGR ROOF BLOWN OFF A BUILDING AT ROCKFORD AIRPORT. 1045 AM NON-TSTM WND DMG 2 SE MCHENRY 42.32N 88.26W 05/30/2008 MCHENRY IL TRAINED SPOTTER WIND GUSTS UP TO AROUND 40 MPH WITH TREE LIMBS AND POWER LINES DOWN. 1050 AM NON-TSTM WND GST ISLAND LAKE 42.28N 88.20W 05/30/2008 M64.00 MPH MCHENRY IL MESONET 1055 AM NON-TSTM WND DMG WOODSTOCK 42.31N 88.44W 05/30/2008 MCHENRY IL TRAINED SPOTTER MEASURED WIND GUST OF 57 MPH WITH 4 FOOT IN DIAMETER TREE DOWN AND MULTIPLE POWER LINES DOWN. 1055 AM NON-TSTM WND DMG ROCKFORD 42.27N 89.06W 05/30/2008 WINNEBAGO IL TRAINED SPOTTER SMALL LIMBS DOWN NEAR INTERSECTION OF I90 AND BUSINESS US-20. 1100 AM NON-TSTM WND DMG WOODSTOCK 42.31N 88.44W 05/30/2008 MCHENRY IL TRAINED SPOTTER TREE ON HOUSE NEAR BIRCH AND JULIE STREET. INJURIES REPORTED. 1100 AM NON-TSTM WND DMG WOODSTOCK 42.31N 88.44W 05/30/2008 MCHENRY IL TRAINED SPOTTER UNKNOWN AMOUNT OF INJURIES ASSOCIATED WITH FALLING DEBRIS NEAR INTERSECTION OF KISHWAUKEE VALLEY AND ROSE FARM STREET. 1100 AM NON-TSTM WND DMG WOODSTOCK 42.31N 88.44W 05/30/2008 MCHENRY IL TRAINED SPOTTER LIGHTPOLE IN INTERSECTION OF RT. 47 AND RT. 120. 1100 AM NON-TSTM WND DMG WOODSTOCK 42.31N 88.44W 05/30/2008 MCHENRY IL TRAINED SPOTTER TREE ON HOUSE NEAR BIRCH AND JULIE STREET. 1100 AM NON-TSTM WND DMG 6 N MARENGO 42.33N 88.60W 05/30/2008 MCHENRY IL TRAINED SPOTTER LARGE TREE ON HOUSE WITH NUMEROUS TREES DOWN ALONG KISHWAUKEE VALLEY ROAD BETWEEN GARDEN PRAIRIE ROAD AND ILLINOIS 23. 1100 AM NON-TSTM WND GST 6 SSE BEACH PARK 42.35N 87.81W 05/30/2008 M58.00 MPH LMZ740 IL C-MAN STATION 1102 AM NON-TSTM WND GST MUNDELEIN 42.27N 88.00W 05/30/2008 M51.00 MPH LAKE IL EMERGENCY MNGR 1110 AM NON-TSTM WND DMG MARENGO 42.25N 88.60W 05/30/2008 MCHENRY IL TRAINED SPOTTER LARGE TREE DOWN NEAR FOREST ST. AND HWY 23. 1110 AM NON-TSTM WND DMG LIBERTYVILLE 42.28N 87.97W 05/30/2008 LAKE IL TRAINED SPOTTER TREE DOWN ON ELLIS AVENUE AT WINCHESTER RD. 1122 AM NON-TSTM WND DMG 2 E WAUKEGAN 42.37N 87.83W 05/30/2008 LAKE IL BROADCAST MEDIA 37 FT. LONG CHARTER BOAT CAPSIZED IN LAKE MICHIGAN WITH 7 PEOPLE ON BOARD. ALL WERE RESCUED A HALF HOUR LATER BY US COAST GUARD. 1130 AM NON-TSTM WND DMG LIBERTYVILLE 42.28N 87.97W 05/30/2008 LAKE IL AMATEUR RADIO ESTIMATED WIND GUST 55MPH. 30 FOOT TREE DOWN ACROSS POWER LINES NEAR RT. 137 AND DES PLAINES RIVER. 1132 AM NON-TSTM WND DMG MARENGO 42.25N 88.60W 05/30/2008 MCHENRY IL TRAINED SPOTTER OVERTURNED SEMI ON RT. 20 AND I90. 1136 AM NON-TSTM WND GST ROCHELLE 41.92N 89.06W 05/30/2008 M53.00 MPH OGLE IL AWOS REPORT FROM ROCHELLE AIRPORT. 1145 AM NON-TSTM WND GST GURNEE 42.38N 87.94W 05/30/2008 M61.00 MPH LAKE IL MESONET MEASURED AT SCHOOL MESONET. 1145 AM NON-TSTM WND DMG WAUKEGAN 42.37N 87.87W 05/30/2008 LAKE IL AMATEUR RADIO ESTIMATED WIND GUSTS OF 55 MPH WITH TREES AND LARGE BRANCHES DOWN NEAR LEWIS AVENUE. 1153 AM NON-TSTM WND DMG MALTA 41.93N 88.86W 05/30/2008 DE KALB IL LAW ENFORCEMENT TREES DOWN. 1155 AM NON-TSTM WND GST DE KALB 41.93N 88.75W 05/30/2008 M52.00 MPH DE KALB IL AWOS MEASURED AT DE KALB AIRPORT. 1200 PM NON-TSTM WND GST 2 E CHICAGO 41.88N 87.59W 05/30/2008 M58.00 MPH LMZ741 IL C-MAN STATION MEASURED AT HARRISON-DEVER CRIB. 1200 PM NON-TSTM WND DMG STREAMWOOD 42.02N 88.17W 05/30/2008 COOK IL TRAINED SPOTTER ESTIMATED 55 MPH GUSTS WITH SMALL TREE LIMBS DOWN. 0401 PM TSTM WND GST 5 S GILMAN 40.69N 88.00W 05/30/2008 M60.00 MPH IROQUOIS IL TRAINED SPOTTER 5 MILES SOUTH OF GILMAN ON INTERSTATE 57. 0410 PM TSTM WND DMG CISSNA PARK 40.57N 87.89W 05/30/2008 IROQUOIS IL PUBLIC MULTIPLE LARGE TREES DOWN. 0413 PM TSTM WND DMG 1 SW PAXTON 40.45N 88.11W 05/30/2008 FORD IL TRAINED SPOTTER OVER TURNED SEMI IN MEDIAN ON INTERSTATE 57 NEAR MILE MARKER 264. 0445 PM HAIL FREELAND PARK 40.61N 87.49W 05/30/2008 M1.00 INCH BENTON IN TRAINED SPOTTER 0445 PM HAIL DUNNINGTON 40.56N 87.49W 05/30/2008 M1.00 INCH BENTON IL TRAINED SPOTTER 0515 PM HAIL S OXFORD 40.52N 87.25W 05/30/2008 M0.25 INCH BENTON IN PUBLIC 0520 PM HEAVY RAIN EARL PARK 40.69N 87.42W 05/30/2008 M1.20 INCH BENTON IN EMERGENCY MNGR 0520 PM HEAVY RAIN FOWLER 40.62N 87.32W 05/30/2008 M2.85 INCH BENTON IN EMERGENCY MNGR 0525 PM HEAVY RAIN 5 W WATSEKA 40.78N 87.83W 05/30/2008 M1.52 INCH IROQUOIS IL TRAINED SPOTTER STREETS IN WATSEKA ARE FLOODED AND FIELDS AND DITCHES ARE FULL. 0528 PM HEAVY RAIN MAPLE PARK 41.91N 88.59W 05/30/2008 M1.00 INCH KANE IL TRAINED SPOTTER 1 INCH OF RAIN IN THE LAST 20 MIN. 3 MILES WEST OF 47 ON RT 38 0540 PM TSTM WND DMG 5 SW MILFORD 40.58N 87.76W 05/30/2008 IROQUOIS IL TRAINED SPOTTER NUMEROUS TREES DOWN WITH ONE ON A TRAILER. 0603 PM FLOOD MILFORD 40.63N 87.70W 05/30/2008 IROQUOIS IL TRAINED SPOTTER ROADWAYS FLOODED IN TOWN. 0613 PM HEAVY RAIN 4 W BOSWELL 40.52N 87.46W 05/30/2008 M1.60 INCH BENTON IN TRAINED SPOTTER 0639 PM HEAVY RAIN CHATSWORTH 40.75N 88.29W 05/30/2008 M2.48 INCH LIVINGSTON IL TRAINED SPOTTER 0641 PM HAIL MAZON 41.24N 88.42W 05/30/2008 M0.25 INCH GRUNDY IL EMERGENCY MNGR 0642 PM HAIL MAZON 41.24N 88.42W 05/30/2008 M1.00 INCH GRUNDY IL TRAINED SPOTTER 0646 PM HAIL MAZON 41.24N 88.42W 05/30/2008 M0.75 INCH GRUNDY IL EMERGENCY MNGR 0646 PM TSTM WND GST MAZON 41.24N 88.42W 05/30/2008 M50.00 MPH GRUNDY IL EMERGENCY MNGR 0650 PM HAIL CARBON HILL 41.30N 88.30W 05/30/2008 M1.75 INCH GRUNDY IL EMERGENCY MNGR NEAR INTERSECTION OF REED ROAD AND JUGTOWN 0651 PM HAIL BRAIDWOOD 41.27N 88.22W 05/30/2008 M0.88 INCH WILL IL EMERGENCY MNGR 0655 PM TSTM WND DMG S BRAIDWOOD 41.27N 88.22W 05/30/2008 WILL IL LAW ENFORCEMENT TRACTOR TRAILER BLOWN OVER ON I55 NEAR MILE MARKER 232. 0659 PM TSTM WND DMG MAZON 41.24N 88.42W 05/30/2008 GRUNDY IL EMERGENCY MNGR 6 TO 8 INCH TREE LIMBS DOWN ON CENTER STREET. 0701 PM HAIL COAL CITY 41.29N 88.28W 05/30/2008 M0.75 INCH GRUNDY IL EMERGENCY MNGR 0701 PM FLOOD 1 E MAZON 41.24N 88.41W 05/30/2008 GRUNDY IL EMERGENCY MNGR RT. 47 IS COVERED WITH WATER. TYNAN ROAD ALSO WATER COVERED. 0702 PM HAIL LOWELL 41.29N 87.41W 05/30/2008 M1.00 INCH LAKE IN TRAINED SPOTTER QUARTER SIZE HAIL REPORTED NEAR RT. 2 AND COMMERCIAL STREET. 0713 PM HAIL MANTENO 41.25N 87.84W 05/30/2008 M1.75 INCH KANKAKEE IL AMATEUR RADIO 0714 PM HAIL MANTENO 41.25N 87.84W 05/30/2008 M1.00 INCH KANKAKEE IL TRAINED SPOTTER 0715 PM HAIL W WILMINGTON 41.30N 88.16W 05/30/2008 M0.25 INCH WILL IL EMERGENCY MNGR REPORTED NEAR STRIP MINE ROAD. 0717 PM HAIL MANTENO 41.25N 87.84W 05/30/2008 M2.50 INCH KANKAKEE IL TRAINED SPOTTER PING PONG BALL TO TENNIS BALL SIZE HAIL COVERING THE GROUND NEAR MAIN STREET AND RT. 50. 0736 PM HAIL 4 E GRANT PARK 41.24N 87.57W 05/30/2008 M0.25 INCH KANKAKEE IL TRAINED SPOTTER PEA TO MARBLE SIZED HAIL COVERING THE GROUND. 0740 PM FLOOD 4 W MILFORD 40.63N 87.77W 05/30/2008 IROQUOIS IL TRAINED SPOTTER SEVERAL ROADS CLOSED FROM FLOODING WITH 3 TO 4 INCHES OF FLOWING WATER. 0740 PM HEAVY RAIN 4 W MILFORD 40.63N 87.77W 05/30/2008 M6.00 INCH IROQUOIS IL TRAINED SPOTTER 6 INCHES OF RAINFALL IN THE LAST 2 HOURS. 0742 PM FLOOD COAL CITY 41.29N 88.28W 05/30/2008 GRUNDY IL EMERGENCY MNGR ROADS FLOODED WITH 4 TO 5 INCHES OF STANDING WATER. 0743 PM FLOOD E MANTENO 41.25N 87.84W 05/30/2008 KANKAKEE IL TRAINED SPOTTER STATE LINE RD AT 10500 N. 1 TO 2 INCHES OF STANDING WATER IN INTERSECTION AND LOW LYING PARTS OF THE ROAD. 0747 PM TSTM WND DMG 3 E GRANT PARK 41.24N 87.59W 05/30/2008 KANKAKEE IL TRAINED SPOTTER POWER LINES AND LARGE BRANCHES DOWN NEAR IL. RT. 1 AND 10050 N. 0749 PM HAIL HEBRON 41.32N 87.20W 05/30/2008 M0.50 INCH PORTER IN TRAINED SPOTTER REPORTED NEAR RT. 2 AND INTERSTATE 65. 0753 PM TSTM WND DMG GRANT PARK 41.24N 87.64W 05/30/2008 KANKAKEE IL TRAINED SPOTTER TELEPHONE POLES DOWN. 0753 PM TSTM WND DMG 2 N GRANT PARK 41.27N 87.64W 05/30/2008 KANKAKEE IL TRAINED SPOTTER POWER LINES DOWN. 0800 PM HAIL KOUTS 41.32N 87.03W 05/30/2008 M0.25 INCH PORTER IN EMERGENCY MNGR 0802 PM HAIL LOWELL 41.29N 87.41W 05/30/2008 M1.00 INCH LAKE IN TRAINED SPOTTER QUARTER SIZE HAIL REPORTED NEAR RT. 2 AND COMMERCIAL STREET. 0827 PM FLOOD BRADLEY 41.15N 87.86W 05/30/2008 KANKAKEE IL AMATEUR RADIO RAILROAD VIADUCT FLOODED NEAR INTERSECTION OF BROOKMONT ST. AND SCHUYLER AVE. 0930 PM FLOOD 2 W FOWLER 40.62N 87.36W 05/30/2008 BENTON IN LAW ENFORCEMENT US 41 2 MILES WEST OF FOWLER IS FLOODED FOR A STRETCH OF 3 MILES. 0930 PM FLOOD FOWLER 40.62N 87.32W 05/30/2008 BENTON IN LAW ENFORCEMENT HIGHWAY 18 WEST BOUND LANE IS FLOODED. 0930 PM FLOOD FOWLER 40.62N 87.32W 05/30/2008 BENTON IN LAW ENFORCEMENT MERIDIAN ROAD CLOSED FROM 100 NORTH TO 300 SOUTH. |
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