1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 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 St. Louis, MO wrote its last area forecast discussion before the first event at May 18, 9:20 PM CST, 4 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 1020 PM CDT TUE MAY 18 2004 .DISCUSSION... ROUND 2 OF CNVTN FIRING OVR NW MO A BIT ERYR THAN ANTICIPATED. HWVR..INGREDIENTS APR TO BE IN PLACE FOR HVY...AND PERHAPS EXCESSIVE...RAINFALL. OVRRUNNING OF COOL DOME FROM DAYTIME MCS APRS TO HV INITIATED CNVTN...AND INCRG LO LVL FLO WL PROVIDE CNVTV COMPLEX WITH SM PRETTY STOUT AIR THRUOUT THE NGT. MUCAPES OVR E OK-S KS STILL AOA 2500 AT 02Z...AND PCPN WATER VALUES PROGGED TO CLIMB ABV 1.5 BY 12Z. CORFIDI VECTORS HV A PRONOUCED S COMPONENT...BUT JUDGING FROM NRLY STNRY 85H MSTR CNVGC BULLSEYE 03-09Z BLV CURRENT ACTIVITY IS GOING TO BE ANCHORED IN ITS CURRENT LOCATION FOR A WHILE...BFR OUTFLO BGNS TO INFLUENCE OVRALL STM MOTION. DUE TO ABV FACTORS...HV ISSUED FLOOD WATCH FOR MOST OF MID MO THRU 6 AM. AM A BIT UNCERTAIN HOW FAR E AND S TO TAKE WATCH...BUT WITH ABV REASONING THIS AREA CERTAINLY APRS TO BE MOST UNDER THE GUN. NO CHGS RMNDR OF FCST. && .LSX WATCHES/WARNINGS/ADVISORIES... .MO...FLOOD WATCH PARTS OF MID MISSOURI THRU 6 AM. MOZ041-042-047>051-059-060-062- .IL...NONE && TRUETT EFFECTIVE 7 AM JUNE 8 2004...THE AWIPS PRODUCT IDENTIFIER FOR THIS PRODUCT WILL CHANGE FROM AFDSTL TO AFDLSX. THE WMO HEADER WILL REMAIN UNCHANGED. PLEASE ENSURE THAT ANY NEEDED CHANGES ARE COMPLETED BY JUNE 8 2004.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 410 PM CDT TUE MAY 18 2004 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-191200- ADAMS IL-AUDRAIN-BOND IL-BOONE-BROWN-CALHOUN IL-CALLAWAY-CLINTON IL- COLE-CRAWFORD-FAYETTE IL-FRANKLIN-GASCONADE-GREENE IL-IRON-JEFFERSON- JERSEY IL-KNOX-LEWIS-LINCOLN-MACOUPIN IL-MADISON-MADISON IL-MARION- MARION IL-MONITEAU-MONROE-MONROE IL-MONTGOMERY-MONTGOMERY IL-OSAGE- PIKE-PIKE IL-RALLS-RANDOLPH IL-REYNOLDS-SHELBY-ST CHARLES- ST CLAIR IL-ST FRANCOIS-ST LOUIS-ST LOUIS CITY-STE GENEVIEVE-WARREN- WASHINGTON-WASHINGTON IL- 410 PM CDT TUE MAY 18 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND EASTERN MISSOURI AS WELL AS PARTS OF SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THE SLIGHT RISK OF SEVERE THUNDERSTORMS CONTINUES ACROSS THE ENTIRE AREA. A COLD FRONT WILL STALL ACROSS THE CENTRAL THIRD OF MISSOURI AND CENTRAL ILLINOIS TONIGHT AND WILL REMAIN A FOCUS FOR CONTINUED THUNDERSTORM DEVELOPMENT. ATMOSPHERIC MOISTURE AND INSTABILITY WILL REMAIN AT PLENTIFUL LEVELS. THE PRIMARY SEVERE THREAT WILL BE DAMAGING STRAIGHT LINE WINDS AND LARGE HAIL. LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE WITH THESE STORMS...DUE TO THE HIGH LEVELS OF ATMOSPHERIC MOISTURE AND THE POTENTIAL FOR TRAINING CELLS LATER TONIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS WILL CONTINUE OVER THE AREA ON WEDNESDAY...UNTIL THE SURFACE FRONT FINALLY MOVES NORTH OF THE AREA WEDNESDAY EVENING. THE THREAT FOR SEVERE THUNDERSTORMS APPEARS TO BE LIMITED TO AREAS NORTH OF INTERSTATE 70 IN MISSOURI AND ILLINOIS...WHERE THE FORCING FROM THE SURFACE FRONT WILL BE STRONGEST. SEVERE STORMS WILL BE POSSIBLE ON WEDNESDAY NORTH OF INTERSTATE 70...WITH PRIMARY THREATS BEING LARGE HAIL AND DAMAGING STRAIGHT LINE WINDS. THE CHANCE OF THUNDERSTORMS WILL BRIEFLY RETURN ON THURSDAY NIGHT IN NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS AS A FRONT APPROACHES...THEN STALLS ACROSS THE AREA. A MORE PROLONGED CHANCE OF THUNDERSTORMS WILL BEGIN SATURDAY NIGHT IN NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS...AND EXPAND GRADUALLY SOUTHWARD INTO CENTRAL AND SOUTHERN MISSOURI AND SOUTHWEST ILLINOIS ON SUNDAY. THE CHANCE WILL THEN CONTINUE AREAWIDE THROUGH MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TONIGHT. IN THE EVENT THAT HEAVY RAINFALL OCCURS...STORM SPOTTERS ARE ENCOURAGED TO CALL IN RAINFALL TOTALS AS WELL. TES
PRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO
830 PM CDT TUE MAY 18 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0355 PM HAIL 4 N BRIGHTON 39.10N 90.14W
05/18/2004 1.00 INCH MACOUPIN IL TRAINED SPOTTER
0430 PM HAIL HILLSBORO 39.16N 89.48W
05/18/2004 0.75 INCH MONTGOMERY IL TRAINED SPOTTER
0435 PM TSTM WND DMG 3 E LITCHFIELD 39.18N 89.60W
05/18/2004 MONTGOMERY IL LAW ENFORCEMENT
2-3 TREES BLOCKING HIGHWAY 16.
&&
TRUETTPRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO
830 PM CDT TUE MAY 18 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0355 PM HAIL 4 N BRIGHTON 39.10N 90.14W
05/18/2004 1.00 INCH MACOUPIN IL TRAINED SPOTTER
0430 PM HAIL HILLSBORO 39.16N 89.48W
05/18/2004 0.75 INCH MONTGOMERY IL TRAINED SPOTTER
0435 PM TSTM WND DMG 3 E LITCHFIELD 39.18N 89.60W
05/18/2004 MONTGOMERY IL LAW ENFORCEMENT
2-3 TREES BLOCKING HIGHWAY 16.
&&
TRUETTThe national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
The County Sheriff reported water 6 inches deep flowing over the Elkhorn Creek bridge on Highway 161. Six to 8 inches of water was reported on Highway 19 in Montgomery City.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2004Every state in 2004This day in weather historyWarnings in Missouri, May 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: 5396638.