Widely scattered thunderstorms developed along a departing cold front across southeast Illinois during the afternoon of May 27th. One cell produced wind damage near Claremont in Richland 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.
Widely scattered thunderstorms developed along a departing cold front across southeast Illinois during the afternoon of May 27th. One cell produced wind damage near Claremont in Richland 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 May 27, 2:00 PM CST, 15 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE LINCOLN IL 300 PM CDT THU MAY 27 2010 .DISCUSSION... ISSUED 300 PM CDT THU MAY 27 2010 AN AIRMASS CHANGE IS IN PROGRESS ACROSS CENTRAL IL...WITH LESS HUMID CONDITIONS ON TAP FOR SATURDAY AND SUNDAY OF THE HOLIDAY WEEKEND. THAT WILL NOT PRECLUDE A FEW STORMS FROM TRYING TO DEVELOP ACROSS OUR SE LATER ON SUNDAY AND AGAIN SUNDAY NIGHT AND MONDAY AS THE NEXT COLD FRONT PUSHES ACROSS CENTRAL IL. DEWPOINTS IN THE MID 50S ARE PUSHING SOUTH TOWARD C IL...REPLACING THE MID AND UPPER 60S DEWPOINTS...AND SCATTERED SHOWERS/STORMS. AT 19Z...COOLER HIGH SURFACE PRESSURE WAS CENTERED FROM OKLAHOMA TO MINNESOTA...WITH A DEVELOPING LOW PRESSURE SYSTEM MOVING INTO THE ROCKIES. ALOFT...A DEEP TROUGH ENVELOPED THE WESTERN THIRD OF THE NATION...WITH A BROAD RIDGE FROM THE ROCKIES TO THE OHIO RIVER VALLEY...AND A TROUGH IN THE NEW ENGLAND AREA. SHORT TERM...TONIGHT THROUGH SUNDAY. FOR THIS EVENING...WE WILL STILL SEE A SOME SHOWERS AND STORMS LINGER ACROSS OUR SOUTHERN CWA...AS THE ATMOSPHERE IN THAT AREA REMAINS UNCAPPED AND MODERATELY UNSTABLE. INSTABILITY IS A BIT WEAKER THAN YESTERDAY...WITH LOWER PRECIPITABLE MOISTURE LEVELS. THEREFORE...WE SHOULD SEE LESS HEAVY RAINFALL TODAY. A FEW STORMS MAY DROP UP TO AN INCH...BUT THEY WILL BE MUCH LESS NUMEROUS THIS EVENING. ANY SHOWERS/STORMS THAT CONTINUE INTO THE EVENING SHOULD DISSIPATE BY MIDNIGHT...AS DRY/COOL AIR PUSHES SOUTH INTO THE REMAINDER OF THE CWA. FOR FRIDAY AND SATURDAY...PLEASANT WEATHER IS IN STORE...AS LOWER HUMIDITY AND SUNSHINE PREVAIL. THE HIGH PRESSURE AXIS WILL REMAIN WEST OF ILLINOIS THROUGH SATURDAY...THEN MOVE EAST AND DISSIPATE ON SUNDAY AS THE TROUGH IN THE WEST MOVES CLOSER TO ILLINOIS. THAT WILL SET THE STAGE FOR RETURN FLOW TO SET UP...BRINGING MOISTER BACK TO THE AREA. MODEL GUIDANCE SHOWS A LOW PRESSURE SYSTEM MOVING INTO THE GULF COAST AREA...WITH MOISTURE RETURN ENERGIZED BY THAT CIRCULATION. THE ECMWF IS DRIER THAN THE GFS...BUT STILL BRINGS STORMS CLOSE TO OUR SE CWA...WHEN IT PREVIOUSLY KEPT THEM FARTHER AWAY. THEREFORE...WE INTRODUCED SOME SLIGHT CHANCE POPS SE OF I-70 SUNDAY AFTERNOON. LONG TERM...SUNDAY NIGHT THROUGH THURSDAY. A BETTER CHANCE FOR STORMS WILL COME WITH A COLD FRONTAL PASSAGE ON SUNDAY NIGHT AND MEMORIAL DAY. INSTABILITY PARAMS ARE MODERATELY UNSTABLE ALONG AND AHEAD OF THE FRONT...SO SOME OF THE STORMS MAY BE STRONG WITH HAIL AND GUSTY WINDS. WILL NEED TO WATCH THE STRENGTH OF THE LLJ AND THE FORWARD MOTION OF THE FRONT TO LOOK FOR ANY INTENSIFICATION OF LOW LEVEL MOISTURE CONVERGENCE. THAT WOULD INCREASE SURFACE BASED INSTABILITY SO THE STORMS CAN TAP INTO THE RETURN MOISTURE FROM THE GULF COAST. THE STORMS SHOULD END FROM NW TO SE ON MEMORIAL DAY...SO SOME OF THE DAY SHOULD BE DRY NW OF I-70. A MORE ZONAL FLOW ALOFT WILL DEVELOP BEHIND THAT COLD FRONT...HELPING TO MOVE WEATHER SYSTEMS ACROSS THE REGION MORE QUICKLY DURING THE WEEK. THE HIGH PRESSURE THAT ARRIVES BEHIND THAT COLD FRONT WILL NOT BE VERY STRONG ANY WAY...SO SHOWERS AND STORMS WILL BE READY TO RE-DEVELOP SOON AFTER ON TUES NIGHT AND WEDNESDAY. BETTER CHANCES FOR STORMS WILL COME ON WED NIGHT AND THURSDAY AS A LOW PRESSURE SYSTEM PASSES BY TO THE NW OF IL BRINGING A WARM FRONT ACROSS OUR CWA. SHIMON && .AVIATION... ISSUED 101 PM CDT THU MAY 27 2010 NOT MUCH OF A SHIFT OVERALL FOR THE FORECAST FOR ILX TERMINALS. SCT TS IS STILL THE MAIN ISSUE FOR THIS AFTERNOON AND THIS EVENING UNTIL THE DIURNAL CU SETTLE BACK DOWN. CHANCES FOR VCTS ARE BEST IN SRN TERMINALS...WITH VCTS IN TAFS FOR SPI DEC AND CMI. EXPECT ACTIVITY TO BE SO ISOLATED WITH THE POP UP NATURE OF THE STORMS THAT AM KEEPING IT TO VC AND WILL AMEND AS SOON AS ANYTHING POPS. BEST SHOWER SO FAR THIS MORNING WAS CLOSE TO CMI...BUT DID NOT ACTUALLY HIT THE AIRPORT. WITH THIS IN MIND...WILL CONT TO MONITOR. AFTER 00Z...WEAK NERLY WINDS AND SCT CIRRUS WILL DOMINATE THROUGH THE MORNING. DEWPOINTS DROPPING THROUGH THE EVENING SHOULD PRECLUDE THE THREAT OF A VISIBILITY TO DROP FOR MUCH OF ILX...ANY PROBLEM THAT WILL DEVELOP FOR THE FOG MAY WELL BE SE OF ANY ILX TERMINALS. HJS && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 1158 AM CDT THU MAY 27 2010 ILZ029-036-037-040-041-047-049-050-281100- CASS-FULTON-MASON-MORGAN-PEORIA-SCHUYLER-SCOTT-TAZEWELL- 1158 AM CDT THU MAY 27 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS CAN BE EXPECTED TODAY. SOME OF THE STORMS MAY APPROACH SEVERE LIMITS. INTENSE LIGHTNING...HAIL AND HEAVY DOWNPOURS WILL BE THE MAIN THREATS WITH ANY STORMS THAT DEVELOP. FLOODING WILL CONTINUE ALONG THE ILLINOIS RIVER...FROM HAVANA DOWNSTREAM...FOR SEVERAL MORE DAYS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA ON MEMORIAL DAY...AND AGAIN ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ027-028-030-031-038-042>046-048-051>057-061-281100- CHAMPAIGN-CHRISTIAN-COLES-DE WITT-DOUGLAS-EDGAR-KNOX-LOGAN-MACON- MARSHALL-MCLEAN-MENARD-MOULTRIE-PIATT-SANGAMON-SHELBY-STARK- VERMILION-WOODFORD- 1158 AM CDT THU MAY 27 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS AND EAST CENTRAL ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS CAN BE EXPECTED TODAY. SOME OF THE STORMS MAY APPROACH SEVERE LIMITS. INTENSE LIGHTNING...HAIL AND HEAVY DOWNPOURS WILL BE THE MAIN THREATS WITH ANY STORMS THAT DEVELOP. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA ON MEMORIAL DAY...AND AGAIN ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ062-066-067-071-072-281100- CLAY-CUMBERLAND-EFFINGHAM-JASPER-RICHLAND- 1158 AM CDT THU MAY 27 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS CAN BE EXPECTED TODAY INTO THIS EVENING. SOME OF THE STORMS MAY APPROACH SEVERE LIMITS. INTENSE LIGHTNING...HAIL AND HEAVY DOWNPOURS WILL BE THE MAIN THREATS WITH ANY STORMS THAT DEVELOP. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA ON MEMORIAL DAY...AND AGAIN ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ063-068-073-281100- CLARK-CRAWFORD-LAWRENCE- 1158 AM CDT THU MAY 27 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS CAN BE EXPECTED TODAY INTO THIS EVENING. SOME OF THE STORMS MAY APPROACH SEVERE LIMITS. INTENSE LIGHTNING...HAIL AND HEAVY DOWNPOURS WILL BE THE MAIN THREATS WITH ANY STORMS THAT DEVELOP. MINOR FLOODING WILL CONTINUE ON THE WABASH RIVER...FROM PALESTINE NORTHWARD...FOR THE NEXT FEW DAYS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA ON MEMORIAL DAY...AND AGAIN ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. HJS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
946 AM CDT THU MAY 27 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN 5 W SPRINGFIELD 39.78N 89.74W
05/27/2010 M2.26 INCH SANGAMON IL MESONET
24 HOUR TOTAL...COCORAHS
0700 AM HEAVY RAIN 4 W SPRINGFIELD 39.78N 89.72W
05/27/2010 M2.10 INCH SANGAMON IL MESONET
24 HOUR TOTAL...COCORAHS
0700 AM HEAVY RAIN 2 W RIVERTON 39.85N 89.58W
05/27/2010 M2.09 INCH SANGAMON IL MESONET
24 HOUR TOTAL...COCORAHS
0700 AM HEAVY RAIN 1 NNW ARTHUR 39.73N 88.48W
05/27/2010 M1.67 INCH MOULTRIE IL MESONET
24 HOUR TOTAL...COCORAHS
0700 AM HEAVY RAIN 1 NW GLENARM 39.63N 89.68W
05/27/2010 M1.63 INCH SANGAMON IL MESONET
24 HOUR TOTAL...COCORAHS
0700 AM HEAVY RAIN 1 E SPRINGFIELD 39.78N 89.63W
05/27/2010 M4.60 INCH SANGAMON IL MESONET
24 HOUR TOTAL...COCORAHS
&&
DPKThe Evansville,IN radar (KVWX), 55 km away, was scanning. The volume nearest the first event began at 20:15 UTC.
1 thunderstorm wind. Local standard time, as filed.
A few trees were blown down in Claremont.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2010Every state in 2010This day in weather historyWarnings in Illinois, May 2010
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: 227296.