A cluster of thunderstorms developed in the evening near the I-70 corridor ahead of a slow moving cold front. These thunderstorms produced heavy rain and isolated flash flooding across southeast Illinois, with some locations observing rainfall rates that exceeded 2 inches per hour.
Every event with a place to put it. Tap one for its entry below.
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.
A cluster of thunderstorms developed in the evening near the I-70 corridor ahead of a slow moving cold front. These thunderstorms produced heavy rain and isolated flash flooding across southeast Illinois, with some locations observing rainfall rates that exceeded 2 inches per hour. An additional cluster of thunderstorms moved across the same areas early on the morning of August 9th, producing more flooding.
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 8, 7:44 PM CST, 36 minutes earlier.
Area Forecast Discussion National Weather Service Lincoln IL 844 PM CDT Mon Aug 8 2022 .SYNOPSIS... Issued at 228 PM CDT Mon Aug 8 2022 Showers and thunderstorms are expected across parts of east central and southeast IL tonight, with flash flooding the main concern. Rain will taper off across the area late tonight and Tuesday, with cooler temperatures expected for Tuesday. Highs for the rest of the week are expected to be in the upper 70s to mid 80s across central Illinois. && .UPDATE... Issued at 844 PM CDT Mon Aug 8 2022 At 8 pm a cold front was analyzed from Taylorville to Danville, and was moving southeast near 15 mph. The airmass ahead of the front is moisture- laded, reflected by PWAT values near 2.2" based on latest mesoanalysis. This coupled with with MLCAPEs over 2000 J/kg favors efficient warm rain processes. Vertical shear is very weak, resulting in unorganized storms and slow storm motions. Recent one hour rainfall rates near the I-70 corridor have been estimated near 2". Given the favorable environment for heavy rain, flash flooding is the primary concern tonight and the region is captured by the Flash Flood Watch in effect until 4 am. Farther north, a few post frontal showers are possible this evening, with the overnight hours dominated by low and mid level clouds. Light north flow will bring lower dew points south gradually, allowing lows to drop to the low/mid 60s for northern parts of the CWA. && .SHORT TERM...(This evening through Tuesday) ISSUED AT 228 PM CDT Mon Aug 8 2022 Currently, an upper wave is moving east through Ontario and a surface cold front is draped from Chicago to just east of Peoria. This front will move southeast tonight, helping fire off some thunderstorms across the area. Originally, was thinking storms would fire between Peoria and Bloomington before 3 PM, but the latest mesoanalysis is indicating this might be hard to do. So, it may wait until it pushes a little further east. Still, there are a few cells that have initiated in the southeastern zones ahead of the front in ~3000 J/kg of MLCAPE. Deep shear continues to look limited, so severe storms will be hard to come by. However, precipitable water values around 2 inches and a slow moving forcing mechanism may combine to produce some training thunderstorms today. Have issued a flash flood watch through 4 AM for the southern zones, primarily south of I-72 where the HREF continues to point towards an elevated excessive rainfall potential in the LPMM product. Precipitation chances look to continue late tonight and into early tomorrow in the vicinity of the front. Skies will be cloudy in most areas to start, but give way to some sun later tomorrow starting in the NW with considerably cooler air in place area- wide. .LONG TERM...(Tuesday night through Monday) ISSUED AT 228 PM CDT Mon Aug 8 2022 In the long term, we'll see a central U.S. ridge and eastern U.S. trough with IL right in between. The influence of the trough and cooler surface high will dominate our area, keeping temperatures slightly below average and conditions on the drier side. There is a hint of precipitation chances for Thu and Sun/Mon. But chances are relatively low at this time. && .AVIATION...(For the 00Z TAFS through 00Z Tuesday evening) Issued at 611 PM CDT Mon Aug 8 2022 Challenging aviation forecast over the next 12-18 hours with TSRA and IFR ceilings likely at some terminals. A cold front stretched from KSPI-KTIP at 23z and was pressing southeast at 12 kt. Models are in good agreement that convection will increase along the boundary this evening and persist overnight with KDEC-KCMI on the northern edge of the active weather, and this is where tempo groups for TSRA are included. Confidence is low on the ending time of precip behind the front, and have stretched VCSH to 12z at KDEC-KCMI. The other main issue is low ceilings behind the cold front, with MVFR currently observed at KPIA-KBMI. Short range guidance is in good agreement that ceilings will lower to IFR at KSPI-KDEC-KCMI for several hours tonight, with slow improvement from the north after daybreak. Lower confidence on scattering of the lower ceilings but model consensus around 16-18z is forecast. Aside from brief winds over 10 kt immediately behind the front, winds will be light through the period, veering northwest to northeast. && .ILX WATCHES/WARNINGS/ADVISORIES... Flood Watch until 4 AM CDT Tuesday for ILZ052-054>057-061>063- 066>068-071>073. && UPDATE...25 SYNOPSIS...Knutsvig SHORT TERM...Knutsvig LONG TERM...Knutsvig AVIATION...25
Hazardous Weather Outlook National Weather Service Lincoln IL 345 PM CDT Mon Aug 8 2022 ILZ027>031-036>038-040>051-053-092045- Knox-Stark-Peoria-Marshall-Woodford-Fulton-Tazewell-McLean-Schuyler- Mason-Logan-De Witt-Piatt-Champaign-Vermilion-Cass-Menard-Scott- Morgan-Sangamon-Macon- 345 PM CDT Mon Aug 8 2022 This Hazardous Weather Outlook is for central Illinois, east central Illinois and west central Illinois. .DAY ONE...Tonight. Scattered showers and storms are possible near and east of the I-55 corridor through this evening. The main hazards with any storms are lightning and heavy rainfall. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated tonight. ILZ052-054>057-061>063-066>068-071>073-092045- Christian-Moultrie-Douglas-Coles-Edgar-Shelby-Cumberland-Clark- Effingham-Jasper-Crawford-Clay-Richland-Lawrence- 345 PM CDT Mon Aug 8 2022 This Hazardous Weather Outlook is for central Illinois, east central Illinois and southeast Illinois. .DAY ONE...Tonight. Showers and storms are expected through tonight. Locally heavy rain and flash flooding is possible, especially where storms repeat over the same areas. A Flood Watch is in effect through late tonight. A few storms may also become strong and produce gusty winds. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Additional showers and storms are possible at times through Tuesday night. The probability for severe weather is low, although locally heavy rain will be possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated tonight. NMB
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
901 PM CDT MON AUG 8 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0900 PM HEAVY RAIN 2 WNW EFFINGHAM 39.13N 88.57W
08/08/2022 M2.34 INCH EFFINGHAM IL COCORAHS
&&The Evansville,IN radar (KVWX), 83 km away, was scanning. The volume nearest the first event began at 02:19 UTC.
6 flash flood. Local standard time, as filed.
The intersection of Main Street and South Jackson Street was closed due to water flowing across the roadway.
Water was flowing across the road in spots along Route 121 between Toledo and Mattoon.
Water was flowing across Route 130.
Water was flowing across Route 45 southwest of Neoga.
Water was flowing across Route 128 near Findlay.
Water was flowing across the roadway near the intersection of 2100 North and 1000 East east of Assumption.
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: 1052024, 1052238, 1052025, 1052239, 1052240, 1052241.