A cold front will push south across the Western U.S. into Tuesday with mountain snow and areas of gusty to high winds. An area of low pressure will form along this front on Tuesday and bring a potential for severe thunderstorms with tornadoes and excessive rainfall in the lower to mid Mississippi River Valley. To the north, heavy snow is possible in parts of the upper Midwest. Read More >
Overview
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Fast Facts: A supercell thunderstorm developed over Will County, Illinois in the very early morning hours of August 17 shortly after 2 a.m. This storm would end up sustaining itself for well over an hour as it moved into northwest Indiana. The storm was substantially deep and very well organized, a combination that resulted in large hail and severe winds. While severe storms certainly can produce both, to happen concurrently in the same location is much more rare especially with hail of 1.5" and larger and winds of 70+ mph. This storm had this based on reports, degree of damage, and radar signatures. Hail and wind damage occurred from Peotone, IL in Will County to Wheatfield, IN in Jasper County. |
 NWS Chicago radar (KLOT) cross section of the powerful thunderstorm. |
Storm Reports
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0230 AM HAIL PEOTONE 41.33N 87.80W
08/17/2019 M1.50 INCH WILL IL LAW ENFORCEMENT
0230 AM TSTM WND GST PEOTONE 41.33N 87.80W
08/17/2019 E75.00 MPH WILL IL LAW ENFORCEMENT
0236 AM HAIL PEOTONE 41.33N 87.80W
08/17/2019 M1.75 INCH WILL IL TRAINED SPOTTER
0236 AM TSTM WND GST PEOTONE 41.33N 87.80W
08/17/2019 M63.00 MPH WILL IL TRAINED SPOTTER
0244 AM TSTM WND DMG 4 SW BEECHER 41.30N 87.68W
08/17/2019 WILL IL PUBLIC
FACEBOOK PHOTO OF OLD BARN BLOWN OFF OF ITS
FOUNDATION. TIME ESTIMATED BASED ON RADAR.
0246 AM TSTM WND DMG 3 S BEECHER 41.30N 87.63W
08/17/2019 WILL IL PUBLIC
TWITTER PHOTO OF A LARGE (LIKELY 2 FOOT
DIAMETER) TREE LIMB DOWN IN SOLLITT. TIME
ESTIMATED BASED ON RADAR.
0254 AM TSTM WND DMG GRANT PARK 41.24N 87.64W
08/17/2019 KANKAKEE IL TRAINED SPOTTER
MULTIPLE 6 INCH DIAMETER BRANCHES SNAPPED
OFF HEALTHY TREES. 2 FOOT DIAMETER TREE
DOWNED. REPORT RELAYED VIA HAM OPERATOR ON
NWSCHAT.
0330 AM TSTM WND DMG DEMOTTE 41.19N 87.20W
08/17/2019 JASPER IN TRAINED SPOTTER
TRAINED SPOTTER REPORTS BRANCHES DOWN AND
ESTIMATED 60 MPH WIND GUSTS IN DEMOTTE.
0338 AM TSTM WND DMG 1 SSE WHEATFIELD 41.17N 87.04W
08/17/2019 JASPER IN PUBLIC
FACEBOOK PHOTOS OF MULTIPLE TREES SNAPPED IN
SEVERAL LOCATIONS NEAR WHEATFIELD. TIME
ESTIMATED BASED ON RADAR.
Photos
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| Peotone, IL taken by Mike Shivers | Peotone, IL greenhouse damage by combination of hail and wind, taken by Patrick Pahl |
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| Hail in Peotone, IL taken by Mike Shivers | Wind damage in Wheatfield, IN taken by Joshua Culley | Wind damage in Wheatfield, IN taken by Joshua Culley |
Radar
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| Radar loop of supercell storm from 2-4 a.m. on August 17, 2019. |
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