1 lightning, 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 2, 2:50 PM CST, 1 hour 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 350 PM CDT SUN MAY 2 2004 .DISCUSSION... LARGE SCALE FORCING ASSOCD WITH POTENT VORT MAX MOVING INTO WRN MO ATTM HELPING PRODUCE A NICE CONCENTRATED BAND OF SHRA AND A FEW TSRA OVR SW MO WHERE FORCING IS STGST. ELSEWHERE ACRS THE MS VLY REGION THE COMBO OF WKR FORCING AND COLD TEMPS ALOFT/STEEP LOW-MID LVL LAPSE RATES RESULTING IN SCT COVERAGE OF SHRA AND ISOLD TSRA. JUST ABOUT ANY ECHO ABV ARND 40DBZ PRODUCING SOME GRAUPEL OR SMALL HAIL. BELIEVE WILL CONT TO SEE SCT SHRA/ISOLD TSRA THRU SUNSET...THEN WITH LOSS OF HTG AND STABILIZING AIRMASS THE AREAL COVERAGE WILL DIMINISH. CONVECTIVE CLOUDS UNDERNEATH THE COLD POOL ALOFT SHOULD ALSO SHOW THIS SAME DIMINISHING TREND AFTER SUNSET THRU THE REMAINDER OF THE EVENING. GREATEST LONGEVITY OF PCPN LIKELY TO REMAIN AHEAD OF THE VORT ACRS SE MO WHERE STGR FRCG WILL RESIDE THRU THE EVENING. DURING THE OVERNIGHT HOURS THE FOCUS THEN TURNS TO JUST HOW CHILLY IT WILL GET. NEWER MODEL RUNS A LITTLE SLOWER WITH THE SEWD PROGRESSION OF THE SFC RDG NOW OVR THE NC PLAINS...MOVING INTO NW MO BY MRNG. THE WINDS THEREFORE WILL BE A LTL SLOWER TO DIMINISH AND IN THE EAST THERE ARE SOME QUESTIONS AS TO HOW MUCH LINGERING CLOUDINESS FM THE MS RVR EWD. MY CONFIDENCE IN A PERIOD OF TMPS IN THE 30S LOW ENOUGH TO PRODUCE WDSPRD FROST IS LOW ATTM. CERTAINLY THE BEST POTENTIAL FOR FROST WILL BE FROM NE MO THRU CENTRAL MO WHERE BLV COVERAGE WL BE MORE SCT. ELSEWHERE WL MENTION JUST PATCHY FROST LATE. EVENING SHIFT CAN MONITOR IF THEY FEEL THREAT IS MORE WDSPRD AND A HEADLINE IS NEEDED. HI PRES WL MOV ACRS THE REGION ON MONDAY AND WITH WNDS NOT BCMG SLY TIL AFTERNOON...THE BEGINNING OF THE MODERATION WL BE A BIT SLOWER THAN PRVSLY THOUGHT. MDLS ALSO SHOWING AT LEAST SCT CU DVLMNT. MODERATION AND WARMING THEN STILL ON TRACK FOR TUE AND BYD. NW FLOW IMPULSES TUE INTO WED ARE ALWAYS A LITTLE WORRISOME AND MDLS SHOW A FEW OF THESE TRACKING INVOF OF NRN PTNS OF THE CWFA...BUT VARY ON TIMING AND PSN. ATTM WL KEEP SOME LOW POPS TUE INTO TUE EVENING. WARM FRONTOGENESIS FCST ACRS NRN MO LATE TUE INTO EARLY WED WITH THIS BNDRY LIFTING NEWD DURING THE DAY ON WED AND VERY WARM AIR FM THE PLAINS OVERSPREADING THE REGION. THIS WARM AIRMASS FCST THEN TO REMAIN IN PLACE THRU THE EXTENDED PD AS THE UPR RIDGE TAKES HOLD OVR THE CNTRL U.S. HELPING KEEP ANY BNDRYS TO THE NORTH. && .LSX WATCHES/WARNINGS/ADVISORIES... .MO...NONE .IL...NONE GLASS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 333 PM CDT SUN MAY 2 2004 ILZ095>097-MOZ018-019-026-027-034>036-031100- ADAMS IL-BROWN-KNOX-LEWIS-MARION-MONROE-PIKE-PIKE IL-RALLS-SHELBY- 333 PM CDT SUN MAY 2 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS. .DAY ONE...TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE REGION THIS EVENING. SCATTERED SHOWERS AND A FEW THUNDERSTORMS HAVE DEVELOPED THIS AFTERNOON DUE TO AN UPPER LEVEL DISTURBANCE. THESE SHOWERS AND STORMS WILL CONTINUE TO DEVELOP AND MOVE THROUGH THE REGION UNTIL AROUND SUNSET WHEN THEY WILL BEGIN TO DISSIPATE. MANY OF THESE SHOWERS AND STORMS WILL PRODUCE A BRIEF PERIOD OF HEAVY RAINFALL AND PEA SIZE HAIL. A FEW STORMS MAY BE CAPABLE OF PRODUCING A VERY BRIEF PERIOD OF LARGE HAIL...UP TO AROUND THREE QUARTER INCH IN DIAMETER. SCATTERED FROST IS POSSIBLE LATE TONIGHT AND EARLY MONDAY MORNING AS HIGH PRESSURE MOVES OVER THE AREA BRINGING UNSEASONABLY COLD AIR...A CLEARING SKY AND LIGHT WINDS TO THE REGION. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A SLIGHT CHANCE OF THUNDERSTORMS TUESDAY AND TUESDAY EVENING AS A COLD FRONT DROPS SOUTHWARD INTO THE REGION. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. MOZ041-042-047>051-059-031100- AUDRAIN-BOONE-CALLAWAY-COLE-GASCONADE-MONITEAU-MONTGOMERY-OSAGE- 333 PM CDT SUN MAY 2 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL MISSOURI. .DAY ONE...TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE REGION THIS EVENING. SCATTERED SHOWERS AND A FEW THUNDERSTORMS HAVE DEVELOPED THIS AFTERNOON DUE TO AN UPPER LEVEL DISTURBANCE. THESE SHOWERS AND STORMS WILL CONTINUE TO DEVELOP AND MOVE THROUGH THE REGION UNTIL AROUND SUNSET WHEN THEY WILL BEGIN TO DISSIPATE. MANY OF THESE SHOWERS AND STORMS WILL PRODUCE A BRIEF PERIOD OF HEAVY RAINFALL AND PEA SIZE HAIL. A FEW STORMS MAY BE CAPABLE OF PRODUCING A VERY BRIEF PERIOD OF LARGE HAIL...UP TO AROUND THREE QUARTER INCH IN DIAMETER. SCATTERED FROST IS POSSIBLE LATE TONIGHT AND EARLY MONDAY MORNING AS HIGH PRESSURE MOVES OVER THE AREA BRINGING UNSEASONABLY COLD AIR...A CLEARING SKY AND LIGHT WINDS TO THE REGION. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. ILZ058>060-064-065-069-070-074-079-098>102-MOZ052-060>065-072>075- 084-085-099-031100- BOND IL-CALHOUN IL-CLINTON IL-CRAWFORD-FAYETTE IL-FRANKLIN-GREENE IL- IRON-JEFFERSON-JERSEY IL-LINCOLN-MACOUPIN IL-MADISON-MADISON IL- MARION IL-MONROE IL-MONTGOMERY IL-RANDOLPH IL-REYNOLDS-ST CHARLES- ST CLAIR IL-ST FRANCOIS-ST LOUIS-ST LOUIS CITY-STE GENEVIEVE-WARREN- WASHINGTON-WASHINGTON IL- 333 PM CDT SUN MAY 2 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL AND SOUTHEAST MISSOURI...AS WELL AS SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE REGION THIS EVENING. SCATTERED SHOWERS AND A FEW THUNDERSTORMS HAVE DEVELOPED THIS AFTERNOON DUE TO AN UPPER LEVEL DISTURBANCE. THESE SHOWERS AND STORMS WILL CONTINUE TO DEVELOP AND MOVE THROUGH THE REGION UNTIL AROUND SUNSET WHEN THEY WILL BEGIN TO DISSIPATE. MANY OF THESE SHOWERS AND STORMS WILL PRODUCE A BRIEF PERIOD OF HEAVY RAINFALL AND PEA SIZE HAIL. A FEW STORMS MAY BE CAPABLE OF PRODUCING A VERY BRIEF PERIOD OF LARGE HAIL...UP TO AROUND THREE QUARTER INCH IN DIAMETER. ISOLATED FROST IS POSSIBLE LATE TONIGHT AND EARLY MONDAY MORNING AS HIGH PRESSURE MOVES OVER THE AREA BRINGING UNSEASONABLY COLD AIR...A CLEARING SKY AND LIGHT WINDS TO THE REGION. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. GKS
The St Louis radar (KLSX), 110 km away, was scanning. The volume nearest the first event began at 22:13 UTC.
1 lightning. Local standard time, as filed.
Lightning struck a large tree between two houses in Greenville causing the tree to literally explode. Branches from the tree went through the roof of a garage damaging a truck inside. Fencing between the homes and a swing set were also damaged.
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, 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: 5396565.