Numerous clusters of strong thunderstorms developed along an outflow boundary and ahead of a slowly approaching cold front during the evening of August 29th. Some of the thunderstorm cells merged and produced damaging wind gusts in excess of 60mph, particularly across Vermilion County.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ILX wrote it up.
Numerous clusters of strong thunderstorms developed along an outflow boundary and ahead of a slowly approaching cold front during the evening of August 29th. Some of the thunderstorm cells merged and produced damaging wind gusts in excess of 60mph, particularly across Vermilion County. Excessive rainfall rates led to scattered flash flooding across central Illinois as well.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Lincoln, IL wrote its last area forecast discussion before the first event at Aug 29, 1:48 PM CST, 3 hours 42 minutes earlier.
Area Forecast Discussion National Weather Service Lincoln IL 248 PM CDT Mon Aug 29 2022 .SYNOPSIS... Issued at 248 PM CDT Mon Aug 29 2022 Thunderstorms will develop ahead of a cold front across central Illinois late this afternoon into tonight. Some of the storms could become strong to severe north of the I-70 corridor...with the main hazard being damaging wind gusts. Once the cold front passes, cooler and less humid weather will be on tap for the remainder of the week. && .SHORT TERM...(This evening through Tuesday) ISSUED AT 248 PM CDT Mon Aug 29 2022 19z/2pm surface analysis shows a cold front extending from Wisconsin into eastern Iowa...with an outflow boundary from midday convection noted from just north of Rantoul westward to near Peoria. Robust Cu field has formed ahead of the outflow boundary: however, latest radar imagery is not showing any thunderstorm development across central Illinois yet. With surface dewpoints in the middle to upper 70s, MLCAPEs have climbed above 4000J/kg. Despite the strong instability and presence of a forcing mechanism, very weak winds aloft have thus far prevented rapid storm development. Will continue to monitor the outflow boundary, as scattered cells should develop along it over the next couple of hours. Any storms that form will be capable of damaging wind gusts and large hail late this afternoon. Meanwhile further northwest, storms will eventually develop along the slowly-advancing cold front, but this may not occur until early this evening. Severe weather will be possible along the cold front as well, with the threat gradually decreasing by mid to late evening as the activity crosses I-72 and drops toward the I-70 corridor. Have updated hourly PoPs to better reflect current trends and to feature high chance to likely PoPs this evening as the main cold front energizes. Also delayed the departure of the showers/storms later tonight given slower initial development and frontal movement. As a result, have lingered PoPs everywhere after midnight...with rain chances ending from northwest to southeast toward dawn Tuesday. && .LONG TERM...(Tuesday night through Monday) ISSUED AT 248 PM CDT Mon Aug 29 2022 Once the cold front passes, an extended period of cooler and less humid weather will prevail for the rest of the week before conditions gradually warm by the weekend. Highs will mainly be in the lower to middle 80s Tuesday through Thursday, then will push back into the middle to upper 80s Friday through Monday. && .AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon) Issued at 1234 PM CDT Mon Aug 29 2022 Outflow boundary from thunderstorms currently passing to the north of central Illinois has settled into the Illinois River Valley early this afternoon...as 17z KPIA ob now shows NW winds. Do not think the boundary will have much more southern momentum and in fact may mix back northward a bit this afternoon. Additional thunderstorm cells are still expected to form along this boundary late this afternoon...generally along a KMQB...to KPIA...to KPNT line. Model guidance has not been particularly helpful today, so will rely mainly on observation data to formulate the 18z aviation forecast. As such, have opted to focus convection at KPIA between 22z and 01z...then further south to the I-72 terminals between 01z and 03z. Winds will initially be SW with gusts of 15-20kt this afternoon, then will veer to W/NW and decrease to less than 10kt after cold FROPA later this evening into the overnight hours. && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...Barnes SHORT TERM...Barnes LONG TERM...Barnes AVIATION...Barnes
Hazardous Weather Outlook National Weather Service Lincoln IL 304 PM CDT Mon Aug 29 2022 ILZ027>031-036>038-040>057-061-301100- Knox-Stark-Peoria-Marshall-Woodford-Fulton-Tazewell-McLean-Schuyler- Mason-Logan-De Witt-Piatt-Champaign-Vermilion-Cass-Menard-Scott- Morgan-Sangamon-Christian-Macon-Moultrie-Douglas-Coles-Edgar-Shelby- 304 PM CDT Mon Aug 29 2022 This Hazardous Weather Outlook is for central Illinois, east central Illinois and west central Illinois. .DAY ONE...Tonight. Strong to severe thunderstorms are likely late this afternoon and evening. Damaging straight line winds are the primary hazard, although localized flash flooding of urban areas will be possible as well. The highest risk of severe weather will be focused north of a Havana to Danville line. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed between 4pm and 10pm. ILZ062-063-066>068-071>073-301100- Cumberland-Clark-Effingham-Jasper-Crawford-Clay-Richland-Lawrence- 304 PM CDT Mon Aug 29 2022 This Hazardous Weather Outlook is for east central Illinois and southeast Illinois. .DAY ONE...Tonight. Thunderstorms will drop south of the I-70 corridor by late evening. While widespread severe weather is not expected, isolated damaging wind gusts and localized flash flooding will be possible. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed after 10pm. Barnes
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
106 PM CDT MON AUG 29 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1210 PM TSTM WND DMG 2 S LACON 40.99N 89.41W
08/29/2022 MARSHALL IL LAW ENFORCEMENT
TREE DOWN ON HICKORY GROVE ROAD.
&&Special Weather Statement
National Weather Service Lincoln IL
212 PM CDT Mon Aug 29 2022
ILZ045-046-292030-
Vermilion-Champaign-
212 PM CDT Mon Aug 29 2022
...Strong thunderstorms will impact portions of northern Vermilion
and northeastern Champaign Counties through 330 PM CDT...
At 210 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Stockland to 7 miles west of Paxton.
Movement was southeast at 35 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Strong thunderstorms will be near...
Rantoul around 225 PM CDT.
Other locations in the path of these storms include Gifford, Potomac
and Rossville.
This includes Interstate 57 between mile markers 252 and 257.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4018 8753 4018 8768 4040 8846 4040 8794
4049 8793 4049 8753
TIME...MOT...LOC 1910Z 293DEG 32KT 4069 8761 4046 8824
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
NMASpecial Weather Statement
National Weather Service Lincoln IL
327 PM CDT Mon Aug 29 2022
ILZ046-292115-
Vermilion-
327 PM CDT Mon Aug 29 2022
...Strong thunderstorms will impact portions of central Vermilion
County through 415 PM CDT...
At 327 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles northeast of Danville to near Ogden.
Movement was east at 30 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Danville and Tilton.
This includes Interstate 74 between mile markers 203 and 220.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4013 8790 4029 8793 4043 8753 4009 8753
TIME...MOT...LOC 2027Z 280DEG 27KT 4027 8752 4020 8793
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
NMAThe Lincoln radar (KILX), 49 km away, was scanning. The volume nearest the first event began at 23:32 UTC.
16 thunderstorm wind, 2 flash flood, 1 hail. Local standard time, as filed.
A tree was blown down across Route 97 south of Salisbury.
Trees and a power pole were blown down near the 100 block of Grant Street.
Trees were blown down in Bismarck.
Power poles were blown down and a transformer caught on fire near the 1700 block of Washington Street.
Several large tree limbs were blown down on Denmark Road about 2 miles northwest of Danville.
Power poles were blown down on Poland Road in Danville.
Several large tree branches and power lines were blown down.
Several trees were blown down.
Several trees were damaged in Kickapoo State Park.
A tree and power lines were blown down.
A tree was blown onto power lines.
Several large tree branches and power lines were blown down.
Numerous tree limbs and power lines were blown down. A flag pole was bent.
A tree was blown down.
Water was flowing across numerous streets in Mattoon...including Western Avenue and Charleston Avenue. Vehicles were stalled in high water on Charleston Avenue between 14th Street and 15th Street and on Charleston Avenue near 26th Street.
Water was flowing across the roadway at Pisgah Road and Highway 104 southeast of Jacksonville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2022Every state in 2022This day in weather historyWarnings in Illinois, August 2022
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1052230, 1052231, 1052222, 1052227, 1052220, 1052223, 1052224, 1052234, 1052221, 1052226, 1052235, 1052225, 1052229, 1052233, 1052232, 1052228, 1052236, 1052219, 1052237.