A cold front moved into the region, triggering showers and thunderstorms. Some isolated reports of large hail, damaging wind and lightning strikes were received.
Every event with a place to put it. 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 episode as NWS LSX wrote it up.
A cold front moved into the region, triggering showers and thunderstorms. Some isolated reports of large hail, damaging wind and lightning strikes were received.
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 31, 1:58 PM CST, 1 hour 52 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 258 PM CDT MON MAY 31 2010 .DISCUSSION... /254 PM CDT MON MAY 31 2010/ PLENTY OF STORMS HAVE FIRED UP ALONG AND AHEAD OF THE COLD FRONT TODAY. WITH NUMEROUS OUTFLOWS FROM THE STORMS...ADDITIONAL ACTIVITY IS A GIVEN LATE THIS AFTERNOON AND INTO THE EVENING HOURS...BEFORE COMING TO AN END. ON A SIDE NOTE...FOR THOSE OUTSIDE FOR HOLIDAY FESTIVITIES...WILL SEE STORMS MOVE INTO THE ST. LOUIS METRO AREA BETWEEN 3 PM AND 5 PM. BEYOND THAT MAIN FORECAST ISSUE IN THE SHORT TERM WILL BE HOT AND MUGGY CONDITIONS TUESDAY AND WEDNESDAY WITH STORMS RETURNING TO NORTHERN PORTIONS OF THE AREA LATE TUESDAY NIGHT...THEN SPREADING SOUTH AS A STRONG COLD FRONT MOVES THROUGH...BEFORE COMING TO AN END THURSDAY EVENING. FOR THE EARLY PART OF THIS EVENING...WILL SEE SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE REGION...MAINLY ALONG AND EAST OF A QUINCY TO COLUMBIA TO SPRINGFIELD LINE...TAPERING OFF LATE THIS EVENING. WILL SEE SLIGHTLY COOLER TEMPS TONIGHT BEHIND THE COLD FRONT...WITH LOWS IN THE LOW TO MID 60S WITH UPPER 60S IN THE ST. LOUIS METRO AREA. DUE TO THE RAINFALL TODAY AND THIS EVENING...PLUS CLEARING SKIES AND WINDS BECOMING LIGHT...WILL SEE SOME PATCHY FOG OVER THE AREA TOWARDS DAYBREAK...SO ADDED MENTION TO GRIDS. ON TUESDAY...FRONT WILL STALL OUT JUST TO OUR SOUTH AND WASH OUT...WITH DRY WEATHER RETURNING BRIEFLY ON TUESDAY. BEYOND THAT...AN EVEN MORE POTENT COLD FRONT WILL DEVELOP AND APPROACH THE AREA ON WEDNESDAY. AHEAD OF THIS FRONT WILL SEE AN MCS DEVELOP OVER SOUTHERN IOWA/NORTHERN MO TUESDAY NIGHT AND SLIDE EAST. MODELS SEEM TO HAVE A BETTER HANDLE ON THIS SO KEPT THE CHANCE POPS IN THE NORTH FOR TUESDAY NIGHT AND WEDNESDAY. AS FOR HIGH TEMPS...WILL SEE MID TO UPPER 80S ON TUESDAY AND MID 80S TO LOW 90S FOR WEDNESDAY. PRECIPITATION CHANCES TO INCREASE AND SPREAD SOUTH ACROSS FORECAST AREA WEDNESDAY NIGHT AND THURSDAY...TAPERING OFF THURSDAY NIGHT. AS FOR REST OF EXTENDED... MODELS HAVE NOT HANDLED THE PATTERN VERY WELL...SO KEPT FRIDAY DRY WITH A CHANCE OF RAIN IN THE NORTH FRIDAY NIGHT AND NORTHEAST HALF ON SATURDAY...THEN DRY SATURDAY NIGHT THROUGH MONDAY AT THIS TIME. BYRD && .AVIATION... /1219 PM CDT MON MAY 31 2010/ A WARM MOIST UNSTABLE ENVIRONMENT AHEAD OF A WEAK COLD FRONT HAS LED TO NUMEROUS SHRA/TSTM DEVELOPMENT THIS AFTERNOON. CURRENT RADAR INDICATES THE GREATEST COVERAGE IS EAST OF THE MS RIVER. THE COLD FRONT CURRENTLY EXTENDS FROM JUST NW OF KUIN TO JUST EAST OF KCOU TO JUST EAST OF KSGF. THIS FRONT WILL CONTINUE TO WORK ITS WAY THROUGH THE AREA THIS AFTERNOON AND BE THE FOCUS FOR MORE CONVECTIVE DEVELOPMENT. WINDS IN ADVANCE OF THE FRONT ARE SWLY...BECOMING NWLY BEHIND IT...GENERALLY 10 KTS OR LESS. THE FRONT SHOULD CLEAR THE AREA BY THIS EVENING AND THE CHANCES FOR PRECIP SHOULD END BY 00Z. SKIES WILL CLEAR OVERNIGHT AND WINDS WILL SUBSIDE WHICH WILL LEAD TO THE DEVELOPMENT OF SOME MVFR FOG TOWARDS DAYBREAK. THE FOG WILL BURN OFF BY 14Z WITH SWLY WINDS BECOMING WLY DURING THE DAY WITH JUST SOME DIURNAL CU FORMING LATE MORNING. SPECIFICS FOR KSTL...THERE IS AN OUTFLOW BOUNDARY CURRENTLY MOVING SE FROM A CLUSTER OF THUNDERSTORMS APPROX 15 TO 20 MILES NNW OF THE TERMINAL. LATEST CHECK WITH KSET INDICATES WINDS WERE 32020G30KT IN ASSOC WITH THIS WINDSHIFT. MAY NEED TO INTRODUCE THIS WINDSHIFT IF THE OUTFLOW BOUNDARY CONTINUES TO ENCROACH UPON THE TERMINAL. OTHERWISE...EXPECT SPOTTY SHRA/TSTM FOR THE AFTERNOON. SOME OF THE STRONGER STORMS WILL BE CAPABLE OF SMALL HAIL AND GUSTY WINDS. THIS ACTIVITY WILL DIMINISH THIS EVENING AND SKIES WILL CLEAR OUT. THIS WILL FACILITATE THE FORMATION OF MVFR FOG TOWARDS DAYBREAK. MILLER && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 335 PM CDT MON MAY 31 2010 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-011200- GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL- MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL- CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO- LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO- AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO- LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO- ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO- WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO- MADISON MO-REYNOLDS MO- 335 PM CDT MON MAY 31 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THUNDERSTORMS ARE LIKELY THROUGH THIS EVENING AS A COLD FRONT MOVES THROUGH THE REGION. WHILE ORGANIZED OR WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...SOME OF THE STRONGER STORMS WILL CONTAIN HAIL...GUSTY WINDS AND BRIEF HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A CHANCE FOR THUNDERSTORMS TUESDAY NIGHT THROUGH THURSDAY...AND AGAIN FRIDAY NIGHT AND SATURDAY. THERE IS A SLIGHT RISK OF SEVERE WEATHER OVER NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS TUESDAY NIGHT AND FOR THE ENTIRE FORECAST AREA WEDNESDAY AND WEDNESDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE REQUESTED TO REPORT ANY STRONG WINDS...HAIL... FLOODING...OR RAINFALLS OF OVER AN INCH. && FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1 BYRD
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 243 PM CDT MON MAY 31 2010 MOZ036-312030- PIKE MO- 243 PM CDT MON MAY 31 2010 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN PIKE COUNTY IN NORTHEAST MISSOURI UNTIL 330 PM CDT... AT 241 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 5 MILES SOUTHWEST OF BOWLING GREEN...MOVING EAST AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... BOWLING GREEN... EOLIA... CLARKSVILLE... ASHLEY... ST. CLEMENT... CYRENE... EDGEWOOD... PAYNESVILLE... ANNADA... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. MILLER
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 254 PM CDT MON MAY 31 2010 MOZ052-061-312100- LINCOLN MO-ST. CHARLES MO- 254 PM CDT MON MAY 31 2010 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LINCOLN AND ST. CHARLES COUNTIES UNTIL 400 PM CDT... AT 250 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR WENTZVILLE...MOVING EAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... LAKE ST. LOUIS... ST. PAUL... DARDENNE PRAIRIE... O'FALLON... COTTLEVILLE... WELDON SPRING... ST. PETERS... ST. CHARLES... HARVESTER... ORCHARD FARMS... OLD MONROE... KAMPVILLE... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. MILLER
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
300 PM CDT MON MAY 31 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0300 PM HAIL WENTZVILLE 38.81N 90.86W
05/31/2010 E0.25 INCH ST. CHARLES MO TRAINED SPOTTER
ESTIMATED 25 MPH WINDS
&&
SIPPRELLSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 410 PM CDT MON MAY 31 2010 ILZ101-MOZ063-064-312200- ST. CLAIR IL-ST. LOUIS MO-ST. LOUIS CITY MO- 410 PM CDT MON MAY 31 2010 ...SIGNIFICANT WEATHER ADVISORY FOR ST. LOUIS...ST. LOUIS CITY AND ST. CLAIR COUNTIES UNTIL 500 PM CDT... AT 405 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR MAPLEWOOD...MOVING EAST AT 15 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... DOWNTOWN ST. LOUIS AND LEMAY AROUND 415 PM CDT. EAST CARONDELET AROUND 420 PM CDT. BROOKLYN AND DUPO AROUND 425 PM CDT. SAUGET AND CAHOKIA AROUND 430 PM CDT. EAST ST. LOUIS AND FAIRMONT CITY AROUND 435 PM CDT. WASHINGTON PARK AROUND 440 PM CDT. CENTREVILLE AROUND 445 PM CDT. CASEYVILLE AROUND 450 PM CDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. CVKING
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
428 PM CDT MON MAY 31 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0409 PM TSTM WND DMG 2 ESE CLAYTON 38.64N 90.29W
05/31/2010 ST. LOUIS CITY MO PUBLIC
SAINT LOUIS ZOO REPORTS A LARGE SYCAMORE TREE HAS
FALLEN AND DAMAGED THREE CARS IN FOREST PARK
&&
SIPPRELLPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
450 PM CDT MON MAY 31 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0450 PM HAIL BONNE TERRE 37.92N 90.55W
05/31/2010 E0.88 INCH ST. FRANCOIS MO TRAINED SPOTTER
0450 PM TSTM WND GST BONNE TERRE 37.92N 90.55W
05/31/2010 M45 MPH ST. FRANCOIS MO TRAINED SPOTTER
&&
SIPPRELLThe St Louis radar (KLSX), 88 km away, was scanning. The volume nearest the first event began at 21:48 UTC.
2 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew part of the roof off on a lumber yard building. Also, a power pole in the area was snapped off near the base. It was a very limited area of wind damage.
Thunderstorm winds blew down a large tree onto County Road 16 just southwest of Oakdale.
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: 236367, 236368.