2 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 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 26, 4:00 AM CST, 2 hours 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LINCOLN IL 500 AM CDT THU AUG 26 2004 .DISCUSSION... CANCELLED FLOOD WATCH EARLY THIS MORNING THAT WAS IN EFFECT FOR CENTRAL IL. MOST WIDESPREAD HEAVY RAIN ACTUALLY OCCURING IN SE IL WHICH WAS NOT IN THE FLOOD WATCH. CLAY AND EFFINGHAM COUNTIES HAVE FLASH FLOOD WARNINGS FROM 4 TO 8 AM ALONG WITH COUNTIES JUST SOUTH AND WEST OF THERE. HEAVY RAINS SHOULD DIMINISISH NEXT COUPLE OF HOURS AND LESSEN CHANCE OF FLASH FLOODING AS SHORT WAVE TROF OVER SW IL PUSHES EAST INTO WESTERN INDIANA DURING MID MORNING. SHORT RANGE MODELS AND GUIDANCE NOT TOO DIFFERENT AND POPULATED MOSTLY WITH THE ETA MODEL WITH THIS FORECAST PACKAGE DURING THE NEXT FEW DAYS. FORECAST CHALLENGE IS ADDRESSING CONVECTION CHANCES INTO THIS WEEKEND AS UPPER LEVEL TROF MOVES INTO IL BY SUNDAY AND ASSOCIATED COLD FRONT MOVES SE THRU THE MIDWEST. ALSO WILL ADDRESS HOW HOT AND HUMID IT WILL BE TODAY AND FRIDAY. SHORT TERM...TODAY THROUGH FRIDAY... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS OVER EASTERN IL WITH HEAVIEST RAINS SOUTH OF I-70 EARLY THIS MORNING. CONVECTION IS EAST OF I-55 FROM BLOOMINGTON TO SPRINGFIELD AND MOVING EAST WITH THE SHORT WAVE TROF IN SW IL THAT MOVES TOWARD THE IL/IN BORDER AROUND 15Z. EXPECT CONVECTION TO DIMINISH NEXT FEW HOURS OVER EASTERN IL AND HEAVY RAIN THREAT TO LAST UNTIL 12Z/7 AM. CLEARING SKIES JUST WEST OF ILX CWA AROUND QUINCY SHOULD SPREAD EAST ACROSS CENTRAL AND SE IL DURING THIS MORNING HELPING ATMOSPHERE TO DESTABALIZE. LIFTED INDICES ONLY AROUND 0C RIGHT NOW LOWER TO MINUS 4 TO 8C THIS AFTERNOON AS CAPES ELEVATED TO BETWEEN 2000 AND 4000 J/KG AND MOST UNSTABLE WEST OF THE IL RIVER. SPC HAS SLIGHT RISK OF SEVERE ACROSS CENTRAL AND NORTHERN IL THIS AFTERNOON AND INTO TONIGHT FROM I-70 NORTH WHILE MODERATE RISK IS ACROSS THE WESTERN HALF OF IOWA. THERE IS A BIT OF A CAP TO BREAK TODAY AND BEST LIFT TO STAY NW IL IL TODAY. BUT SHOULD SEE AT LEAST SOME CONVECTION DEVELOP THIS AFTERNOON WITH LINGERING BOUNDARIES FROM EARLY MORNING MCS SO INCREASED POPS FROM 20% TO 30%. 999 MB LOW PRESSURE OVER SOUTHEAST ND HAS A COLD FRONT EXTENDING INTO CENTRAL SD AND NW NEBRASKA. MODELS HAVE TRENDED SLOWER WITH THIS FRONT MOVING SE INTO NW IL BY SUNSET FRIDAY. ETA NOW IS DRY TONIGHT WAITING UNTIL THE DAY FRI TO BRING QPF INTO CENTRAL IL NORTH OF I-70. STILL KEPT PROB30/40 CHANCE OF CONVECTION OVER NW COUNTIES TONIGHT AND INTO CENTRAL IL FRI MORNING AND SE IL FRI AFTERNOON. ATMOSPHERE IS STILL UNSTABLE AHEAD OF THIS FRONT FRI WITH LIFTED INDICES MINUS 4-6C PER ETA AND CAPES OF 2000 TO 3000 J/KG SO FEEL CHANCE OF CONVECTION IS WORTHWHILE EVERYWHERE BY FRI AFTERNOON. SPC HAS SLIGHT RISK FROM LINCOLN IL SW ACROSS MO FRI & FRI NIGHT. LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY... COLD FRONT TO PUSH INTO SE IL SAT AND THINK CONVECTION CHANCES TO INCREASE DURING FRI NIGHT INTO SAT AS OVERRUNNING RAINS DEVELOP AS A SURFACE WAVE EJECTS OUT OF THE SOUTHERN PLAINS AND INTO THE OHIO VALLEY SAT NIGHT. ETA HAS QPF AS FAR NORTH AS I-80 SAT WHILE GFS GOES INTO SOUTHERN WI. EITHER WAY...IT LOOKS LIKE POPS WILL NEED TO BE ELEVATED TO AT LEAST LIKELY CATEGORY SOMETIME BETWEEN FRIDAY NIGHT AND SAT NIGHT DEPENING ON TIMING OF THIS SURFACE WAVE. ONCE THIS SURFACE WAVE PASSES SUNDAY MORNING...MODELS QUICKER WITH DRIER AIR ARRIVING FROM THE WEST SUNDAY. STILL AN UPPER LEVEL TROF MOVING THRU IL DURING THE DAY SUNDAY AND BECAUSE OF THIS FEATURE...KEPT PROB30/40 CHANCE OF CONVECTION EAST OF I-55 AND SLIGHT CHANCE WEST. LOOKS DRY SUNDAY NIGHT THRU WED WITH SEASONABLE TEMPS AS PACIFIC HIGH PRESSURE MOVES INTO THE OHIO VALLEY AND GREAT LAKES REGION. && .ILX WATCHES/WARNINGS/ADVISORIES... IL...NONE. && HUETTL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 531 AM CDT THU AUG 26 2004 ILZ027>031-036>038-040>057-061>063-066>068-071>073-271100- CASS-CHAMPAIGN-CHRISTIAN-CLARK-CLAY-COLES-CRAWFORD-CUMBERLAND- DE WITT-DOUGLAS-EDGAR-EFFINGHAM-FULTON-JASPER-KNOX-LAWRENCE-LOGAN- MACON-MARSHALL-MASON-MCLEAN-MENARD-MORGAN-MOULTRIE-PEORIA-PIATT- RICHLAND-SANGAMON-SCHUYLER-SCOTT-SHELBY-STARK-TAZEWELL-VERMILION- WOODFORD- INCLUDING THE CITIES OF...BLOOMINGTON...CHAMPAIGN...DANVILLE... DECATUR...EFFINGHAM...FLORA...GALESBURG...HAVANA...JACKSONVILLE... LAWRENCEVILLE...LINCOLN...MATTOON...PEORIA...SHELBYVILLE... SPRINGFIELD AND TAYLORVILLE 531 AM CDT THU AUG 26 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND SOUTHEAST ILLINOIS. .DAY ONE...TODAY AND TONIGHT A VERY WARM AND HUMID AIRMASS WILL BE IN PLACE ACROSS THE REGION TODAY AND TONIGHT. A FEW WEAK UPPER AIR DISTURBANCES MOVING THROUGH DURING THE PERIOD MAY TRIGGER THUNDERSTORMS...ESPECIALLY THIS AFTERNOON AND EVENING. A FEW OF THESE STORMS MAY BE SEVERE... PRODUCING DAMAGING WIND GUSTS AND LARGE HAIL. ALSO...ANY THUNDERSTORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN AND FLASH FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A STRONGER UPPER AIR DISTURBANCE WILL MOVE INTO THE REGION ON FRIDAY AND DROP A COLD FRONT INTO THE STATE. THE FRONT WILL LINGER ACROSS THE REGION INTO EARLY SUNDAY...BRINGING A CHANCE OF THUNDERSTORMS TO THE STATE FRIDAY INTO SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING... MAINLY BETWEEN 2 PM AND 8 PM. BAK
The Evansville,IN radar (KVWX), 116 km away, was scanning. The volume nearest the first event began at 12:16 UTC.
2 flash flood. Local standard time, as filed.
Very heavy rain caused US Routes 40 and 45 to become flooded in Effingham.
Very heavy rain caused Illinois Route 130 to become flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2004Every state in 2004This day in weather historyWarnings in Illinois, August 2004
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: 5419364, 5419365.