A complex of early morning thunderstorms formed along a nearly stationary front from southeast Iowa into west central Illinois. These thunderstorms moved to the southeast, and produced heavy rainfall which resulted in flash flooding from daybreak until late morning in Scott County and Morgan 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.
A complex of early morning thunderstorms formed along a nearly stationary front from southeast Iowa into west central Illinois. These thunderstorms moved to the southeast, and produced heavy rainfall which resulted in flash flooding from daybreak until late morning in Scott County and Morgan County.
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 Jun 2, 3:04 AM CST, 2 hours 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LINCOLN IL 404 AM CDT THU JUN 2 2011 .DISCUSSION... ISSUED 319 AM CDT THU JUN 2 2011 UPPER RIDGE ACROSS THE SRN STATES DAMPENED SOMEWHAT AS THIS WAVE PUSHES OUT OF THE PLAINS AND INTO THE MIDWEST. SOME MIDLEVEL INSTABILITY IS RIGHT AT THE IL/MO BORDER AND ENHANCING SOME TS TO THE WEST. DEEP LOW OVER THE WEST COAST PUTS MUCH OF THE FA IN SWRLY FLOW AND ILX JUST ON THE BORDER OF SEVERAL SMALL WAVES PUSHING AROUND THE WRN TROF OVER THE NEXT COUPLE OF DAYS. NONE OF THE SYSTEMS ARE PARTICULARLY STRONG AFTER TODAY AND TONIGHT...AND NO TWO OPERATIONAL MODELS AGREE ON THE TREATMENT. GFS CONTINUES A MAJOR ISSUE WITH PUSHING VORT MAXES OUT OF THE SW...AND OTHER MODELS MAY BE A BIT OVERSTATED WITH DEVELOPING CONVECTION ALONG DYING BOUNDARIES UNDER MASSIVE UPPER RIDGE. CONSERVATIVE THROUGH THE MEDIUM RANGE FORECAST WHICH MEANS THAT TEMPERATURES NEED TO BE ON THE UPPER EDGE OF THE GUIDANCE ENVELOPE AS MUCH OF THE MOS IS TEMPERED SOMEWHAT BY THE PRECIP IN THE FORECAST. SHORT TERM...TODAY AND TONIGHT... SCT SHOWERS AND THUNDERSTORMS IN THE FORECAST TODAY AS THE WAVE TO THE WEST CONTINUES TO PUSH THROUGH CENTRAL AND NORTHERN ILLINOIS THIS MORNING. A BIT OF A BREAK IS SHOWN BY THE 4KM WRF WITH A REFIRING THIS AFTERNOON IN THE NE...BUT LIKELY TO BE A BIT OUT OF THE FA. REFIRING IN THE AFTERNOON NOT AS SUPPORTED BY THE NAM/GFS...AS THE WAVE GETS DEEPER INTO THE SUBSTANTIAL RIDGE OVER MUCH OF THE ERN THIRD OF THE COUNTRY. LONG TERM...FRIDAY THROUGH MONDAY... MAINLY HOT AND DRY. FORECAST TEMPS TOMORROW UP INTO THE 90S WITH HEAT INDEX APPROACHING 100 DEGREES. OTHER THAN THAT...SEVERAL WEAK WAVES SHOWING UP WITH LITTLE AGREEMENT. HAVE PREFERENCE FOR THE ECMWF OR EVEN CANADIAN OVER THE GFS. GFS HAS HAD FAR TOO MANY ISSUES WITH OVERACTIVE CONVECTION. THAT BEING SAID...THE WAVES AND THE ABILITY TO PRODUCE PRECIP WILL BE HIGHLY VARIABLE ON THE STRENGTH OF THE HIGH/TIMING/MESOSCALE BOUNDARIES. MODEL SOLUTIONS SEEM TO BE ATTEMPTING TO CONVERGE ON SCT POPS FOR SAT/SAT NIGHT...AND HAVE LOW ISLD POPS IN/SCT FOR THE FAR NORTH SAT NIGHT FOR NOW. IF ANYTHING WILL HAVE A SHOT AT A PRECIP MENTION IN THE NEXT FORECAST RUN...IT WILL BE SAT NIGHT OR IN THE MONDAY TIME FRAME. PATTERN STALLING OUT OVERALL FOR A FEW DAYS KEEPING THE REGION HOTTER THAN NORMAL...AND PRECIP CHANCES SKETCHY. HJS && .AVIATION... ISSUED 1130 PM CDT WED JUN 1 2011 CONVECTIVE TRENDS ARE THE MAIN CONCERN FOR THE UPCOMING TAF SET. THUNDERSTORM COMPLEX IN WESTERN MISSOURI/IOWA WILL LIKELY HAVE SOME DIFFICULTY MOVING INTO ILLINOIS DUE TO THE DRY ATMOSPHERE UNDER THE HIGH PRESSURE RIDGE...ALTHOUGH SEVERAL MODELS SHOW SOME RAIN ARRIVING TOWARD SUNRISE. AT THE MOMENT...ONLY HAVE ENOUGH CONFIDENCE TO INCLUDE VCSH AT KPIA. WILL LINGER THIS MUCH OF THE MORNING AS THE 4KM WRF MODEL SHOWS SOME ADDITIONAL DEVELOPMENT NEAR THE MISSISSIPPI RIVER AFTER SUNRISE. WILL LEAVE THE REMAINDER OF THE TAF SITES DRY FOR NOW...AS FORECAST SOUNDINGS INDICATE MOISTURE ADVECTION WILL BE LACKING. AM EXPECTING MAINLY MID LEVEL CLOUDS AND SOUTHEAST WINDS NEAR 10 KNOTS AT THESE SITES. GEELHART && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 601 AM CDT THU JUN 2 2011 ILZ027>031-036-037-040-041-047-049-050-031115- CASS-FULTON-KNOX-MARSHALL-MASON-MORGAN-PEORIA-SCHUYLER-SCOTT- STARK-TAZEWELL-WOODFORD- 601 AM CDT THU JUN 2 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT. WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED...HOWEVER SOME STORMS MAY PRODUCE HEAVY RAIN WITH LOCALIZED FLOODING POSSIBLE. A FEW OF THE STORMS COULD PRODUCE GUSTY WINDS AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS ON SATURDAY NIGHT. FLOODING WILL CONTINUE ALONG THE ILLINOIS RIVER FROM HENRY DOWNSTREAM FOR THE NEXT SEVERAL DAYS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ038-042>046-048-051>055-061-031115- CHAMPAIGN-CHRISTIAN-DE WITT-DOUGLAS-LOGAN-MACON-MCLEAN-MENARD- MOULTRIE-PIATT-SANGAMON-SHELBY-VERMILION- 601 AM CDT THU JUN 2 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS AND EAST CENTRAL ILLINOIS. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT. WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED...HOWEVER SOME STORMS MAY PRODUCE HEAVY RAIN WITH LOCALIZED FLOODING POSSIBLE. A FEW OF THE STORMS COULD PRODUCE GUSTY WINDS AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ056-057-062-063-066>068-071>073-031115- CLARK-CLAY-COLES-CRAWFORD-CUMBERLAND-EDGAR-EFFINGHAM-JASPER- LAWRENCE-RICHLAND- 601 AM CDT THU JUN 2 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS WILL BE POSSIBLE TODAY. SEVERE WEATHER IS NOT ANTICIPATED. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY FLOODING WILL CONTINUE ALONG THE WABASH RIVER FOR THE NEXT SEVERAL DAYS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. GOETSCH
The Lincoln radar (KILX), 111 km away, was scanning. The volume nearest the first event began at 11:16 UTC.
2 flash flood. Local standard time, as filed.
Heavy rainfall rates of more than 1.50 inches per hour for about two hours resulted in flash flooding in northwest Morgan County. Numerous roads were flooded around Meredosia and state highways 67 and 104 were closed during the early morning.
Heavy rainfall rates of more than 1.50 inches per hour for about two hours resulted in flash flooding in northern Scott County. Numerous roads were flooded around the town of Bluffs, including State Highway 100 during the early morning.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2011Every state in 2011This day in weather historyWarnings in Illinois, June 2011
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: 328379, 328386.