A weak stationary front draped across central Illinois provided the focus for scattered strong thunderstorms in parts of west central Illinois from late in the evening August 9th into the early morning of August 10th. Several thunderstorms training across already saturated areas of Fulton County produced flash flooding.
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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 weak stationary front draped across central Illinois provided the focus for scattered strong thunderstorms in parts of west central Illinois from late in the evening August 9th into the early morning of August 10th. Several thunderstorms training across already saturated areas of Fulton County produced flash 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 9, 7:33 PM CST, 2 hours 57 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LINCOLN IL 833 PM CDT MON AUG 9 2010 .DISCUSSION... ISSUED 833 PM CDT MON AUG 9 2010 ISOLATED STORMS DEVELOPED THIS EVENING ALONG AN OUTFLOW BOUNDARY EXTENDING FROM BURLINGTON TO DANVILLE. THERE IS LITTLE IN THE WAY OF SUPPORT FOR THESE STORMS NOW THAT THE SUN IS SETTING...AND HAVE SEEN A CORRESPONDING DECREASE IN OVERALL ACTIVITY. CONVECTION HAS BEEN SUPPRESSED ALONG THE WESTERN PORTIONS OF THE BOUNDARY DUE TO SUBSIDENCE FROM A SMALL-SCALE UPPER HIGH OVER NORTHEASTERN MISSOURI. THE POTENTIAL STILL EXISTS FOR CONVECTION TO FIRE UP TO THE WEST LATER TONIGHT OVER SOUTHERN IOWA/NORTHERN MISSOURI...BUT CONDITIONS ARE NOT AS FAVORABLE AS THE PREVIOUS NIGHT. WILL RETAIN CHANCE POPS IN THE NORTH FOR THIS POTENTIAL. FORECAST HAS ALREADY BEEN UPDATED TO PUT IN ISOLATED THUNDER IN THE NORTHEAST...AND DO NOT ANTICIPATE ANY FURTHER CHANGES. 04 && .AVIATION... ISSUED 616 PM CDT MON AUG 9 2010 SVRL OUTFLOW BNDRYS APPARENT IN SFC/STLT DATA THIS AFTN...BUT THE MORE IMPORTANT ONE FOR PSBL TSTM INITIATION EXTNDS OMA-BRL-PIA-IKK. MSTR/INSTABILITY SUFFICIENT FOR CNVCTN...HWVR DVLPMT IS BEING SUPPRESSED BY SUBSIDENCE ASSOCIATED WITH A SUB-SYNOPTIC UPR HIGH OVR NERN MO/SERN IA. MOST LKLY SCENERIO TNGT WL BE FOR ISOLD STORMS FM BMI/DEC EWD THIS EVE ALG THE ERN EXTENT OF OUTFLOW BNDRY...THEN MORE VIGOROUS DVLPMT OVR FAR WRN PTN OF BNDRY LTR TNGT. SHORT RANGE FCST MDLS DVLP TSTMS OVR SWRN/SRN IA TNGT...THEN MOVE THEM EWD TWD WRN IL AFT 06Z. SO WL PUT IN SOME VCTS FOR PIA FOR NOW AFT 06Z AND WAIT TO SEE HOW THINGS DVLP BEF THE 06Z TAF ISSUANCE. FOR TUE...COMPOSITE OUTFLOW BNDRY/WM FNT IS FCST TO EXTND NW-SE ACRS THE AREA...WITH SCT AFTN STORMS ALG IT. MORE UNCERTAINTY EXISTS FOR THIS ACTIVITY AS IT WL BE MODULATED BY ANTICIPATED DVLPMT TNGT. WL THEREFORE KEEP TAFS PCPN-FREE AFT 15Z. 04 && .PREV DISCUSSION... ISSUED 250 PM CDT MON AUG 9 2010 MAIN CONCERN FOR THIS PACKAGE REMAINS WITH THE EXCESSIVE HEAT. EARLIER MCS HAS FADED AWAY...AND TEMPERATURES AND DEWPOINTS HAVE BEEN RISING NICELY...DESPITE A FAIR AMOUNT OF CLOUD DEBRIS. DEWPOINTS IN THE MID 70S HAVE SPREAD AS FAR NORTH AS THE I-74 CORRIDOR FROM BLOOMINGTON TO DANVILLE...WITH UPPER 70S TO NEAR 80 FURTHER SOUTH. HEAT INDEX CURRENTLY ABOVE 100F IN ALL LOCATIONS EXCEPT THE EXTREME NORTHERN CWA. SOME LOCATIONS FROM TAYLORVILLE TO OLNEY SHOWING 110 OR HIGHER THIS HOUR...ALTHOUGH LOCAL MEASURING EQUIPMENT MAY BE INFLATING TEMP/DEWPOINT VALUES SLIGHTLY. SHORT TERM...TONIGHT THROUGH THURSDAY... STRONG UPPER RIDGING TO CONTINUE ACROSS THE CENTRAL CONUS THROUGH TUESDAY...BEFORE BEGINNING TO FLATTEN AFTER MIDWEEK. OPPRESSIVE HEAT EXPECTED THROUGH THURSDAY OVER MOST OF THE CWA. QUESTIONS ARISE AS TO CONVECTIVE DEVELOPMENT AND ASSOCIATED CLOUDINESS. MCS ACTIVITY EXPECTED OVER IOWA AGAIN TONIGHT...MOVING ACROSS NORTHERN ILLINOIS. HAVE ADDED POPS ACROSS THE NORTHERN CWA FOR TONIGHT AS THIS PASSES. FAR NORTHERN CWA MAY REACH ADVISORY CRITERIA TOMORROW...BUT THIS WILL BE DEPENDENT ON HOW FAST THE CLOUDS AND RAIN BREAK UP...SO WILL LEAVE AREAS FROM GALESBURG TO PEORIA NORTHWARD OUT OF ANY ADVISORIES. FURTHER SOUTH...CLOUD COVER WILL NOT BE AS EXTENSIVE...AND TEMPS/DEWPOINTS EXPECTED TO RISE TO SIMILAR VALUES AS TODAY. WILL EXPAND THE HEAT WARNING NORTHWARD TO INCLUDE COUNTIES FROM LINCOLN TO DECATUR TO PARIS...AND CONTINUE TO MONITOR FOR ANY FURTHER NORTHWARD EXPANSION LATER. REMAINDER OF HEAT ADVISORY...CURRENTLY FROM FULTON TO VERMILION COUNTIES...WILL REMAIN IN PLACE. MODELS HAVING VARIED SOLUTIONS AS TO ANY DAYTIME CONVECTION FURTHER SOUTH IN THE RIDGE...AND OUTFLOWS FROM OVERNIGHT STORMS WILL FURTHER MUDDY THE WATERS. WILL INCLUDE 30 POPS FOR TUESDAY OVER THE SOUTHERN CWA...BUT AREAS NORTH OF I-70 MORE LIKELY TO SEE ANYTHING IF IT OCCURS. FRONTAL BOUNDARY PROGGED TO MOVE ACROSS THE AREA LATE WEDNESDAY NIGHT OR EARLY THURSDAY. WILL INCLUDE POPS EVERYWHERE THROUGH WEDNESDAY NIGHT...THEN TAPER THEM FROM WEST TO EAST ON THURSDAY. STILL LOOKING TO BE RATHER HOT THROUGH THURSDAY AS WELL...ALTHOUGH DEWPOINTS ARE PROGGED TO BE A BIT LOWER BY THEN. HEAT INDICES BELOW 105 ARE LIKELY BY THURSDAY...BUT THE CUMULATIVE EFFECTS OF THE HEAT JUSTIFY KEEPING THE WARNING GOING THAT LONG...AS THAT WILL BE DAY 5 OF THE HEAT WAVE. LONG TERM...FRIDAY THROUGH MONDAY... LONGER RANGE MODELS CONTINUE SHOW THE BREAKDOWN OF THE RIDGE INTO A MORE EAST-WEST CONFIGURATION OVER THE SOUTHERN CONUS...WITH A SHORTWAVE MOVING ACROSS THE NORTHERN CONUS THIS WEEKEND. ASSOCIATED COLD FRONT PROGGED BY BOTH THE ECMWF/GFS TO PASS THROUGH THE AREA SATURDAY AFTERNOON OR EVENING...WITH THE NEXT SIGNIFICANT CHANCE OF PRECIPITATION. ONCE THAT PASSES...THE UPPER RIDGE SHOULD AMPLIFY ACROSS THE WESTERN U.S. THIS WILL RESULT IN MORE OF A NORTHWESTERLY FLOW OVER OUR AREA...FINALLY BRINGING TEMPERATURES BACK TO NORMAL EARLY NEXT WEEK. GEELHART && .ILX WATCHES/WARNINGS/ADVISORIES... EXCESSIVE HEAT WARNING UNTIL 8 PM CDT THURSDAY FOR ILZ040-042- 047>057-061>063-066>068-071>073. HEAT ADVISORY UNTIL 8 PM CDT TUESDAY FOR ILZ036>038-041-043>046. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 313 PM CDT MON AUG 9 2010 ILZ036>038-041-043>046-101200- CHAMPAIGN-DE WITT-FULTON-MASON-MCLEAN-PIATT-TAZEWELL-VERMILION- 313 PM CDT MON AUG 9 2010 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS AND EAST CENTRAL ILLINOIS. .DAY ONE...TONIGHT HIGH TEMPERATURES IN THE LOW TO MID 90S AND TROPICAL HUMIDITY WILL RESULT IN HEAT INDICES OF 100 TO 107 DEGREES THROUGH SUNSET. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ANOTHER HEAT WAVE IS EXPECTED MUCH OF THIS WEEK...SIMILAR TO THE HEAT AND HUMIDITY OF A FEW DAYS AGO. MANY AREAS WILL SEE AFTERNOON AND EARLY EVENING HEAT INDEX VALUES OF 100 TO 107 DEGREES...BEING THE HIGHEST ON TUESDAY AFTERNOON. THERE IS A CHANCE OF THUNDERSTORMS TUESDAY THROUGH WEDNESDAY NIGHT AND AGAIN SATURDAY AND SATURDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ040-042-047>057-061>063-066>068-071>073-101200- CASS-CHRISTIAN-CLARK-CLAY-COLES-CRAWFORD-CUMBERLAND-DOUGLAS-EDGAR- EFFINGHAM-JASPER-LAWRENCE-LOGAN-MACON-MENARD-MORGAN-MOULTRIE- RICHLAND-SANGAMON-SCHUYLER-SCOTT-SHELBY- 313 PM CDT MON AUG 9 2010 ...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 8 PM CDT THURSDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS...EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...TONIGHT HIGH TEMPERATURES IN THE 90S AND TROPICAL HUMIDITY WILL RESULT IN HEAT INDICES FROM 100 TO 110 DEGREES THROUGH SUNSET. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ANOTHER HEAT WAVE IS EXPECTED MUCH OF THIS WEEK...SIMILAR TO THE HEAT AND HUMIDITY OF A FEW DAYS AGO. MANY AREAS WILL SEE AFTERNOON AND EARLY EVENING HEAT INDEX VALUES OF 100 TO 110 DEGREES...BEING THE HIGHEST TUESDAY AFTERNOON. THIS HEAT WAVE COULD LINGER INTO FRIDAY AFTERNOON IN SOUTHEAST ILLINOIS...WITH HEAT INDICES AROUND 100 DEGREES SOUTHEAST OF I-70. THERE IS A CHANCE OF THUNDERSTORMS TUESDAY THROUGH WEDNESDAY NIGHT AND AGAIN SATURDAY AND SATURDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ027>031-101200- KNOX-MARSHALL-PEORIA-STARK-WOODFORD- 313 PM CDT MON AUG 9 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS. .DAY ONE...TONIGHT HEAT INDICES WILL REACH BETWEEN 97 AND 102 DEGREES THROUGH SUNSET. THERE IS A CHANCE OF THUNDERSTORMS THROUGH TONIGHT FROM PEORIA NORTH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ANOTHER HEAT WAVE IS EXPECTED THROUGH AT LEAST THURSDAY...SIMILAR TO THE HEAT AND HUMIDITY OF A FEW DAYS AGO. THE MOST OPPRESSIVE PERIOD IS EXPECTED TO TUESDAY AFTERNOON AND EARLY EVENING...WHEN MANY AREAS WILL SEE HEAT INDEX VALUES OF 100 TO 105 DEGREES. THERE IS A CHANCE OF THUNDERSTORMS TUESDAY THROUGH WEDNESDAY NIGHT AND AGAIN SATURDAY AND SATURDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. KH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LINCOLN IL 932 PM CDT MON AUG 9 2010 ILZ036-100330- FULTON- 932 PM CDT MON AUG 9 2010 ...SIGNIFICANT WEATHER ALERT FOR FULTON COUNTY UNTIL 1030 PM CDT... AT 928 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THUNDERSTORMS WERE RAPIDLY DEVELOPING ALONG A LINE EXTENDING FROM FAIRVIEW TO CUBA...MOVING EAST-SOUTHEAST AT 10 MPH. SMALL HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THESE STORMS. PEOPLE IN FULTON COUNTY...INCLUDING THE CITIES OF FAIRVIEW...CUBA... LEWISTOWN...CANTON AND ST. DAVID...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS...AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. LAT...LON 4062 8990 4033 9009 4038 9038 4070 9034 TIME...MOT...LOC 0232Z 286DEG 8KT 4060 9019 4045 9023 CHURCHILL
The Lincoln radar (KILX), 103 km away, was scanning. The volume nearest the first event began at 04:27 UTC.
1 flash flood. Local standard time, as filed.
Rainfall rates of more than 2.00 inches in an hour produced areas of flash flooding in northwest portions of Fulton County. Several rural roads were inundated and impassable as a result.
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, August 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: 258271.