Excessive rainfall may produce locally considerable flash flooding over parts of South Texas, the western Gulf Coast, and Lower Mississippi River Valley through Thursday. Hot temperatures will persist over central and northern California and the Pacific Northwest through today. Read More >
Overview
Two rounds of severe thunderstorms occurred on Thursday, June 28. The first round during the midday hours was relatively minor. The more significant outbreak occurred during the evening hours, when a thunderstorm complex raced southward across southern Illinois and western Kentucky. Widespread wind damage occurred with this complex, which met the definition of a derecho.Tornadoes:
As of late June 29, one tornado has been confirmed. A weak EF-0 tornado occurred near Johnston City, Illinois in Williamson County. Straight-line winds in excess of 65 mph were responsible for most of the damage in our region. Derechos can contain winds of 100 mph or more, as we saw during the "super-derecho" that struck pasts of southern Illinois and southeast Missouri in May, 2009.
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Tornado - Johnston City, IL
Track Map .png) 
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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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Photos:
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| Shelf cloud at NWS Paducah (Ashley Ravenscraft) |
Gallatin County IL High School (Shawneetown Fire Dept) |
Shelf cloud at Jackson, MO (Rachel Trevino) |
Radar:
Radar loop link below is from 11 AM to 11 PM. The main event was from 6 PM to 10 PM as the derecho moved from south to north.
Click here for a radar loop of this event
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Storm Reports
Below is a map of just some of the damage that occurred during the evening derecho on June 28. A nearly continuous damage area encompassed the Interstate 57 corridor of southern Illinois down through the Purchase area of western Kentucky. Damage was more sporadic on either side of this area. One fatality occurred in Carlisle County, Kentucky, where a motorcyclist was killed after striking a fallen tree.
0535 PM HAIL E SESSER 38.09N 89.05W
06/28/2018 E0.88 INCH FRANKLIN IL EMERGENCY MNGR
0650 PM TSTM WND DMG TAMAROA 38.14N 89.23W
06/28/2018 PERRY IL EMERGENCY MNGR
MULTIPLE TREES REPORTED DOWN ACROSS TOWN. ENTIRE TOWN
WITHOUT POWER.
0655 PM TSTM WND DMG MOUNT VERNON 38.32N 88.91W
06/28/2018 JEFFERSON IL EMERGENCY MNGR
POWER OUTAGES REPORTED THROUGHOUT THE COUNTY.
0658 PM TSTM WND DMG PINCKNEYVILLE 38.08N 89.38W
06/28/2018 PERRY IL TRAINED SPOTTER
MULTIPLE REPORTS OF TREES DOWN IN THE PINCKNEYVILLE AREA.
AT LEAST ONE TREE DOWN ON POWER LINES.
0700 PM TSTM WND GST SESSER 38.09N 89.05W
06/28/2018 E70.00 MPH FRANKLIN IL PUBLIC
ESTIMATED WIND GUSTS OF 70 MPH AS IT MOVED THROUGH TOWN.
0700 PM TSTM WND DMG DU QUOIN 38.00N 89.24W
06/28/2018 PERRY IL LAW ENFORCEMENT
MULTIPLE REPORTS OF TREES AND LIMBS DOWN ACROSS TOWN.
0700 PM TSTM WND DMG 3 W WHITTINGTON 38.09N 88.96W
06/28/2018 FRANKLIN IL EMERGENCY MNGR
ESTIMATED AT LEAST 60 MPH WINDS. MULTIPLE POWER POLES
DOWN INCLUDING ONE TRAPPING A VEHICLE ON STATE HWY 154 AT
REND LAKE.
0700 PM TSTM WND DMG DU QUOIN 38.00N 89.24W
06/28/2018 PERRY IL EMERGENCY MNGR
TREE DOWN ON AN ATTACHED GARAGE
0705 PM TSTM WND DMG WEST CITY 38.00N 88.95W
06/28/2018 FRANKLIN IL TRAINED SPOTTER
MULTIPLE TREES DOWN IN THE WEST CITY AREA.
0705 PM TSTM WND GST WAYNE CITY 38.35N 88.59W
06/28/2018 E75.00 MPH WAYNE IL BROADCAST MEDIA
75 MPH GUST MEASURED BY WUNDERGROUND PERSONAL WEATHER
STATION.
0705 PM TSTM WND DMG BENTON 38.01N 88.92W
06/28/2018 FRANKLIN IL TRAINED SPOTTER
TREES DOWN ON POWER LINES. UP TO 2 FOOT DIAMETER TREE
BRANCHES DOWN ON NORTH SIDE OF TOWN. STREET FLOODING
OCCURRING.
0712 PM TORNADO 1 E JOHNSTON CITY
06/28/2018 WILLIAMSON IL NWS STORM SURVEY
A BRIEF EF-0 TORNADO OCCURRED APPROXIMATELY 1 MILE EAST OF
JOHNSTON CITY. TWO GARAGE BUILDINGS WERE BLOWN OFF THEIR
FOUNDATIONS AND NUMEROUS TREES WERE UPROOTED OR SNAPPED WITHIN
THE DAMAGE PATH. ESTIMATED PEAK WIND AT 85 MPH.
0713 PM TSTM WND GST CARBONDALE 37.72N 89.22W
06/28/2018 M67.00 MPH JACKSON IL ASOS
67 MPH WIND GUST RECORDED AT SOUTHERN ILLINOIS AIRPORT IN
CARBONDALE.
0715 PM TSTM WND DMG CARTERVILLE 37.76N 89.08W
06/28/2018 WILLIAMSON IL TRAINED SPOTTER
SHINGLES BLOWN OFF ROOF, TREES DOWN, POWER OUT IN
PORTIONS OF TOWN.
0715 PM TSTM WND DMG BURNA 37.26N 88.39W
06/28/2018 LIVINGSTON KY PUBLIC
SEVERAL TREES UPROOTED ON HWY 60 NEAR INTERSECTION OF HWY
135
0715 PM TSTM WND GST CARTERVILLE 37.76N 89.08W
06/28/2018 E60.00 MPH WILLIAMSON IL TRAINED SPOTTER
WINDS ESTIMATED AT 60+ MPH IN CARTERVILLE
0715 PM TSTM WND DMG HERRIN 37.80N 89.03W
06/28/2018 WILLIAMSON IL PUBLIC
NUMEROUS REPORTS OF TREES, POWER LINES, AND LARGE TREE
LIMBS DOWN. WIDESPREAD POWER OUTAGES.
0718 PM TSTM WND DMG CARBONDALE 37.72N 89.22W
06/28/2018 JACKSON IL TRAINED SPOTTER
MULTIPLE TREES DOWN IN CARBONDALE. SPOTTER REPORTED A
POSSIBLE FUNNEL CLOUD.
0720 PM TSTM WND GST 2 W MARION 37.73N 88.98W
06/28/2018 E65.00 MPH WILLIAMSON IL TRAINED SPOTTER
65 MPH WIND GUSTS ON WEST SIDE OF MARION
0720 PM TSTM WND DMG RALEIGH 37.83N 88.53W
06/28/2018 SALINE IL LAW ENFORCEMENT
LARGE TREE BLOCKING ILLINOIS RT 34 NORTH OF TOWN.
0720 PM TSTM WND DMG CARBONDALE 37.72N 89.22W
06/28/2018 JACKSON IL TRAINED SPOTTER
MULTIPLE TREES BLOWN DOWN, POWER POLES DOWN, INTENSE
LIGHTNING. OLD ROUTE 13 BLOCKED DUE TO MULTIPLE TREES
ACROSS ROAD BETWEEN GIANT CITY RD AND REED STATION RD.
0720 PM TSTM WND DMG HARRISBURG 37.74N 88.55W
06/28/2018 SALINE IL LAW ENFORCEMENT
SIGN BLOWN APART AT THE HARRISBURG-RALEIGH AIRPORT.
DELAYED REPORT.
0725 PM TSTM WND DMG JOHNSTON CITY 37.82N 88.93W
06/28/2018 WILLIAMSON IL PUBLIC
MULTIPLE TREES DOWN AND STRUCTURAL DAMAGE.
0728 PM TSTM WND DMG 6 S MARION 37.65N 88.94W
06/28/2018 WILLIAMSON IL PUBLIC
PUBLIC REPORT OF A BOAT DOCK BEING RIPPED OFF BY WINDS.
0730 PM TSTM WND DMG CARBONDALE 37.72N 89.22W
06/28/2018 JACKSON IL EMERGENCY MNGR
TREE DAMAGE AND POWER LINES DOWN IN CARBONDALE.
0730 PM TSTM WND DMG MARION 37.73N 88.94W
06/28/2018 WILLIAMSON IL EMERGENCY MNGR
MULTIPLE POWER OUTAGES, TREES AND POWER LINES DOWN
THROUGHOUT THE COUNTY. STRUCTURAL DAMAGE AS WELL.
0735 PM TSTM WND DMG HARRISBURG 37.74N 88.55W
06/28/2018 SALINE IL LAW ENFORCEMENT
NUMEROUS TREES DOWN IN SALINE COUNTY.
0735 PM FLASH FLOOD PINCKNEYVILLE 38.08N 89.38W
06/28/2018 PERRY IL EMERGENCY MNGR
NUMEROUS REPORTS OF FLASH FLOODING ON SEVERAL COUNTY
ROADWAYS THROUGHOUT THE COUNTY.
0740 PM TSTM WND DMG BUNCOMBE 37.47N 88.97W
06/28/2018 JOHNSON IL TRAINED SPOTTER
TREE SPLIT IN HALF AND LANDED ON A HOME. RESIDENT OKAY.
0742 PM TSTM WND DMG WEST FRANKFORT 37.90N 88.93W
06/28/2018 FRANKLIN IL PUBLIC
NUMEROUS TREES AND LARGE LIMBS DOWN AS WELL AS POWER
LINES.
0745 PM TSTM WND DMG EDDYVILLE 37.50N 88.59W
06/28/2018 POPE IL TRAINED SPOTTER
SEVERAL TREES BLOCKING HWY 145 BETWEEN DELWOOD AND
EDDYVILLE. ALSO SEVERAL TREES DOWN BLOCKING EDDYVILLE
BLACKTOP BETWEEN FLICK HILL AND HWY 146 IN GOLCONDA.
0745 PM TSTM WND DMG JUNCTION 37.72N 88.24W
06/28/2018 GALLATIN IL LAW ENFORCEMENT
REPORT OF ROOF BLOWN OFF OF GALLATIN COUNTY SCHOOL. TIME
ESTIMATED BY RADAR.
0750 PM TSTM WND DMG PERRYVILLE 37.73N 89.87W
06/28/2018 PERRY MO LAW ENFORCEMENT
*** 1 INJ *** A PERSON WAS HIT BY AWNING AT INTERSECTION
OF HWY 51 AND 61 DUE TO STRONG WINDS.
0750 PM TSTM WND DMG VIENNA 37.41N 88.89W
06/28/2018 JOHNSON IL EMERGENCY MNGR
WIDESPREAD TREES AND POWER LINES DOWN ACROSS THE COUNTY
0752 PM TSTM WND DMG NORRIS CITY 37.98N 88.33W
06/28/2018 WHITE IL TRAINED SPOTTER
TREE DOWN ON A HOUSE IN NORRIS CITY AND MULTIPLE TREES
DOWN IN THE AREA.
0755 PM FLASH FLOOD PINCKNEYVILLE 38.08N 89.38W
06/28/2018 PERRY IL TRAINED SPOTTER
REPORT OF FLOODING THROUGHOUT PERRY COUNTY. WATER OVER
ROADWAY IN PINCKNEYVILLE WAS UP TO THE BOTTOM OF DOOR ON
TRUCK ON RANDOLPH STREET.
0800 PM TSTM WND DMG ROUND KNOB 37.22N 88.73W
06/28/2018 MASSAC IL PUBLIC
TREE FELL ON A TRAILER.
0800 PM TSTM WND DMG METROPOLIS 37.15N 88.71W
06/28/2018 MASSAC IL LAW ENFORCEMENT
ROOF LIFTED OFF QUINT EXCAVATING ON WEST 10TH STREET.
0809 PM TSTM WND GST WEST PADUCAH 37.08N 88.74W
06/28/2018 E62.00 MPH MCCRACKEN KY ASOS
MEASURED WIND GUST TO 62 MPH AT KPAH ASOS.
0810 PM TSTM WND DMG BROOKPORT 37.12N 88.63W
06/28/2018 MASSAC IL PUBLIC
TREES DOWN IN BROOKPORT.
0810 PM TSTM WND DMG BROOKPORT 37.12N 88.63W
06/28/2018 MASSAC IL PUBLIC
SEVERAL REPORTS OF TREES AND LARGE LIMBS DOWN
0810 PM TSTM WND DMG PADUCAH 37.07N 88.64W
06/28/2018 MCCRACKEN KY PUBLIC
NUMEROUS REPORTS OF TREES AND POWER LINES DOWN AND SOME
POWER OUTAGES IN THE PADUCAH AREA.
0810 PM TSTM WND DMG 3 E BROOKPORT 37.12N 88.57W
06/28/2018 MASSAC IL PUBLIC
LARGE TREE UPROOTED AND HAS FALLEN ON A MOBILE HOME
CARPORT.
0815 PM TSTM WND GST 4 NE MARION 37.37N 88.03W
06/28/2018 M56.00 MPH CRITTENDEN KY MESONET
MEASURED AT KY MESONET
0815 PM TSTM WND DMG MELBER 36.95N 88.73W
06/28/2018 GRAVES KY PUBLIC
LARGE TREE TOOK DOWN POWER POLES AND LINES IN FRONT OF A
HOUSE.
0815 PM TSTM WND DMG LA CENTER 37.07N 88.97W
06/28/2018 BALLARD KY EMERGENCY MNGR
NUMEROUS TREES DOWN ACROSS THE COUNTY.
0820 PM TSTM WND DMG SHARPE 36.97N 88.46W
06/28/2018 MARSHALL KY EMERGENCY MNGR
8-10 INCH DIAMETER TREE DOWN AND 6 FOOT FENCE PANEL DOWN.
0820 PM TSTM WND DMG 1 SE JACKSON 37.37N 89.64W
06/28/2018 CAPE GIRARDEAU MO AMATEUR RADIO
LARGE TREE DOWN NEAR TEEN CHALLENGE IN JACKSON
0820 PM TSTM WND GST REIDLAND 37.01N 88.53W
06/28/2018 E60.00 MPH MCCRACKEN KY PUBLIC
ESTIMATED 60 MPH WINDS.
0821 PM TSTM WND DMG LONE OAK 37.04N 88.67W
06/28/2018 MCCRACKEN KY PUBLIC
POWER OUTAGES REPORTED IN LONE OAK.
0825 PM TSTM WND GST 4 N BENTON 36.91N 88.36W
06/28/2018 M53.00 MPH MARSHALL KY MESONET
MEASURED AT KY MESONET STATION
0830 PM TSTM WND DMG BENTON 36.85N 88.36W
06/28/2018 MARSHALL KY BROADCAST MEDIA
80 PERCENT OF TOWN WITHOUT POWER.
0840 PM FLASH FLOOD CAPE GIRARDEAU 37.31N 89.55W
06/28/2018 CAPE GIRARDEAU MO TRAINED SPOTTER
SPOTTER REPORTED AN ESTIMATE OF 3 INCHES OVER SEVERAL
ROADWAYS IN CAPE GIRARDEAU COUNTY.
0840 PM TSTM WND GST 8 SE MAYFIELD 36.65N 88.54W
06/28/2018 E60.00 MPH GRAVES KY PUBLIC
ESTIMATED 60 MPH WINDS IN FARMINGTON
0840 PM TSTM WND DMG CUNNINGHAM 36.92N 88.91W
06/28/2018 CARLISLE KY EMERGENCY MNGR
TREE ON HOUSE IN CUNNINGHAM AREA ON COUNTY ROAD 1054.
MULTIPLE TREES DOWN THROUGHOUT THE COUNTY.
0844 PM TSTM WND DMG MELBER 36.95N 88.73W
06/28/2018 GRAVES KY EMERGENCY MNGR
TREE DOWN ON A HOUSE.
0845 PM TSTM WND DMG CUNNINGHAM 36.92N 88.91W
06/28/2018 CARLISLE KY EMERGENCY MNGR
HWY 62 BETWEEN CUNNINGHAM AND BARDWELL BASICALLY
IMPASSABLE DUE TO SO MANY TREES ACROSS THE ROAD.
WIDESPREAD TREE DAMAGE ACROSS THE COUNTY.
0845 PM TSTM WND DMG 1 S MURRAY 36.60N 88.32W
06/28/2018 CALLOWAY KY EMERGENCY MNGR
LARGE MAPLE TREE DOWN ONTO POWER LINE ON PEGGY ANN DRIVE
ON SOUTH SIDE OF MURRAY.
0849 PM TSTM WND DMG N CADIZ 36.87N 87.82W
06/28/2018 TRIGG KY EMERGENCY MNGR
MULTIPLE TREES DOWN ON THE NORTH SIDE OF CADIZ.
0850 PM TSTM WND DMG FANCY FARM 36.76N 88.79W
06/28/2018 GRAVES KY TRAINED SPOTTER
SEVERAL REPORTS OF LARGE TREE LIMBS AND TREES DOWN ALONG
WITH POWER OUTAGES
0852 PM TSTM WND DMG CADIZ 36.87N 87.82W
06/28/2018 TRIGG KY EMERGENCY MNGR
WIDESPREAD POWER OUTAGES REPORTED IN TRIGG COUNTY.
0852 PM TSTM WND DMG LA CENTER 37.07N 88.97W
06/28/2018 BALLARD KY PUBLIC
WIDESPREAD POWER OUTAGES REPORTED IN BALLARD COUNTY.
0900 PM TSTM WND DMG 5 NW HOPKINSVILLE 36.91N 87.55W
06/28/2018 CHRISTIAN KY EMERGENCY MNGR
65 MPH WINDS ESTIMATED AND POWER IS OUT ON HWY 91 AT
SINKING FORK CHURCH
0902 PM TSTM WND DMG FREDONIA 37.21N 88.06W
06/28/2018 CALDWELL KY EMERGENCY MNGR
ESTIMATED 700-800 CUSTOMERS WITHOUT POWER IN THE FREDONIA
AREA.
0906 PM FLASH FLOOD 4 N CAPE GIRARDEAU 37.37N 89.55W
06/28/2018 CAPE GIRARDEAU MO LAW ENFORCEMENT
WATER ACROSS STATE ROUTE 177 NEAR TRAIL OF TEARS PARK.
0910 PM TSTM WND GST 4 NW HOPKINSVILLE 36.90N 87.54W
06/28/2018 E80.00 MPH CHRISTIAN KY EMERGENCY MNGR
NEAR SINKING FORK SCHOOL ON HIGHWAY 91 NORTHWEST OF
HOPKINSVILLE
0914 PM TSTM WND DMG HAZEL 36.51N 88.33W
06/28/2018 CALLOWAY KY EMERGENCY MNGR
POWER OUTAGE REPORTED FOR THE ENTIRE HAZEL AREA.
1002 PM TSTM WND DMG WAPPAPELLO 36.94N 90.27W
06/28/2018 WAYNE MO EMERGENCY MNGR
TREES DOWN.
1048 PM TSTM WND GST ELLSINORE 36.93N 90.75W
06/28/2018 M50.00 MPH CARTER MO BROADCAST MEDIA
MEASURED VIA PERSONAL WEATHER STATION.
Environment
A very moist and unstable air mass set the stage for this derecho. Surface dew points were near 80 degrees, with mixed-layer capes over 4000. When the atmosphere is that unstable, wind shear does not need to be particularly strong for significant severe weather to occur.
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| Figure 1: CAPE at 21z | Figure 2: 0-6 km shear at 21z | Figure 3: 850 mb at 21z |
Additional environment-related info from the SPC.
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| Figure 4: MCD 931 from SPC | Figure 5: Storm report map for 6/28 | Figure 6: 500 mb map (00z 29 Jun) |
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