Isolated storms developed over the area. A few of the storms produced large hail.
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.
Isolated storms developed over the area. A few of the storms produced large hail.
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 Oct 12, 4:04 PM CST, 1 hour 11 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 504 PM CDT TUE OCT 12 2010 .DISCUSSION... /220 PM CDT TUE OCT 12 2010/ SATELLITE DATA INDICATES CENTER OF H500 LO OVER NCNTRL AR AND IS MOVING SEWD. FOR THE TIME BEING...TWO AREAS OF VORTICITY APPEAR TO BE THE MAIN PLAYERS IN GENERATING PCPN...ONE JUST UPSTREAM TO THE SE FROM KSLO...AND THE OTHER NEAR KUNO JUST TO THE SW OF THE SWRN EDGE OF THE FA IN SERN MO. BELIEVE THAT AREAS IN-BETWEEN WILL FILL-IN SOMEWHAT LATER THIS AFTN AND CONTINUE THRU THE VERY EARLY EVENING HOURS TILL ABOUT 01Z OR SO. THUNDER THAT DOES FORM THIS AFTN SHOULD BE GONE BY 00Z WITH LOSS OF HEATING WITH CELLS THAT REMAIN IN THE DISSIPATING STAGE. MAY NEED TO MAKE SOME ADJUSTMENTS TO THE EARLY EVENING FCST BEFORE IT GOES TO PRESS. OTHERWISE...THE MAIN PCPN THREAT HEADING INTO LATER TONIGHT WILL COME IN THE WAKE OF A CDFNT LATE TONIGHT AND WEDNESDAY THANKS TO LEFTOVER MOISTURE AND SOME SHEARED AREAS OF VORTICITY. STRONGER LIFT FROM A SHORTWAVE WILL ARRIVE TOO LATE ON WEDNESDAY WITH MUCH OF THE MOISTURE ALREADY YANKED TO THE S TO PRODUCE LITTLE NET EFFECT. VERY DRY AIR WILL THEN RAPIDLY BUILD IN TO THE AREA BY WEDNESDAY EVENING RESULTING IN CLEAR SKIES HEADING INTO THE WEEKEND. WE WILL SEE SLIGHTLY BELOW NORMAL DAYTIME TEMPS OVER THE NEXT FEW DAYS THRU FRIDAY WITH ANOTHER CDFNT EXPECTED TO COME THRU THE AREA DRY ON THURSDAY NIGHT. FOR THE EXTENDED PERIOD (FRIDAY NIGHT - TUESDAY)...A RESURGENT H500 RIDGE WILL BRIEFLY DOMINATE THE WEEKEND BEFORE COLLAPSING INTO A VERY PROGRESSIVE ZONAL FLOW PATTERN FOR EARLY NEXT WEEK. AT THE SFC...THIS MEANS THAT WARMER SLY RETURN FLOW KICKS IN FULLY BY SATURDAY AND CONTINUES INTO SUNDAY AND MONDAY WITH A CDFNT SLIDING THRU EARLY NEXT WEEK THAT WILL BE STRONGER THAN THE PREVIOUS TWO FRONTS FROM THE PAST WEEK. THIS WILL GIVE US CLEAR SKIES AND ABOVE NORMAL TEMPS FOR SATURDAY AND SUNDAY WITH A TRANSITION DAY ON MONDAY FOLLOWED BY A BELOW NORMAL TEMP DAY ON TUESDAY. THERE IS SOME MODEL DIFFERENCES OF AROUND 12HRS ON THE TIMING OF THE CDFNT BUT NEARLY ALL NWP SOLNS CARRY THE CDFNT THRU BY THE BEGINNING OF TUESDAY TO FCST A COOLER DAY WITH SOME CONFIDENCE...ESPECIALLY GIVEN THE HIGHLY PROGRESSIVE NATURE OF THE MID LEVEL FLOW. SENSIBLE WX SHOULD BE LACKING UNTIL AT LEAST LATE MONDAY INTO TUESDAY WITH THE CDFNT EXPECTED TO MOVE THRU SOMETIME DURING THIS TIMEFRAME. TES && .AVIATION... /454 PM CDT TUE OCT 12 2010/ CONVECTION ROTATING AROUND THE UPPER LOW HAS STAYED SOUTH OF THE TERMINALS THIS AFTERNOON. THIS TREND WILL CONTINUE AS STORM MOTION IS TO THE SOUTH AND LOSS OF DAYTIME HEATING SHOULD LIMIT ADDITIONAL DEVELOPMENT. MAIN FEATURE OF INTEREST WILL BE THE COLD FRONTAL PASSAGE TONIGHT WHICH WILL BRING GUSTY NORTH/NORTHWEST WINDS TO THE AREA ON WEDNESDAY. COULD SEE A BRIEF PERIOD OF LOW END VFR CLOUDS BEHIND THE FRONT...BUT BELIEVE FRONT WILL COME THROUGH DRY. SPECIFICS FOR KSTL... EXPECT MID/HIGH LEVEL CLOUD DECK FROM CONVECTION WELL TO THE SOUTHEAST OF THE TERMINAL WILL HANG AROUND THIS EVENING. OTHERWISE COLD FRONT WILL PASS ACROSS TERMINAL LATE TONIGHT WITH GUSTY NORTH/NORTHWEST WINDS EXPECTED ON WEDNESDAY. COULD SEE A BRIEF PERIOD OF LOW END VFR CEILINGS DIRECTLY BEHIND THE FRONT...FOR NOW HAVE A SCT DECK TO HINT AT THE POSSIBILITY. OTHERWISE...DRIER AIR WILL WORK INTO THE AREA BY WEDNESDAY AFTERNOON WITH CLEAR SKIES. CVKING && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 305 PM CDT TUE OCT 12 2010 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-131200- 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- 305 PM CDT TUE OCT 12 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS EARLY THIS EVENING ACROSS PARTS OF CENTRAL...EAST CENTRAL...AND SOUTHEAST MISSOURI AS WELL AS SOUTHWEST ILLINOIS. SOME OF THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 30 MPH. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. TES
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
506 PM CDT TUE OCT 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0505 PM HAIL NEW ATHENS 38.32N 89.88W
10/12/2010 E0.25 INCH ST. CLAIR IL LAW ENFORCEMENT
&&
TRUETTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
509 PM CDT TUE OCT 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0507 PM HAIL NEW ATHENS 38.32N 89.88W
10/12/2010 E0.70 INCH ST. CLAIR IL TRAINED SPOTTER
&&
TRUETTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
529 PM CDT TUE OCT 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0529 PM HAIL RED BUD 38.21N 90.00W
10/12/2010 E0.25 INCH RANDOLPH IL TRAINED SPOTTER
&&
TRUETTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
530 PM CDT TUE OCT 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0530 PM HAIL ENE RED BUD 38.21N 90.00W
10/12/2010 M0.75 INCH RANDOLPH IL TRAINED SPOTTER
&&
CARNEYPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
534 PM CDT TUE OCT 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0529 PM HAIL RED BUD 38.21N 90.00W
10/12/2010 M1.00 INCH RANDOLPH IL TRAINED SPOTTER
ALSO...42 MPH WIND GUST
&&
CARNEYSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 600 PM CDT TUE OCT 12 2010 ILZ079-MOZ075-122345- RANDOLPH IL-STE. GENEVIEVE MO- 600 PM CDT TUE OCT 12 2010 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN STE. GENEVIEVE AND WESTERN RANDOLPH COUNTIES UNTIL 645 PM CDT... AT 556 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR BLOOMSDALE...OR 9 MILES NORTHWEST OF STE. GENEVIEVE...MOVING SOUTHWEST AT 10 MPH. HAIL UP TO THE SIZE OF PENNIES 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... BLOOMSDALE... ROCKY RIDGE... WEINGARTEN... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS... FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. 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. CARNEY
The St Louis radar (KLSX), 98 km away, was scanning. The volume nearest the first event began at 23:12 UTC.
1 lightning. Local standard time, as filed.
As storms moved through the area, lightning struck the tower at the Ste. Genevieve County 911 Dispatch Center. It knocked out the center's radios and one of its two telephone consoles and did damage to computers. Everything was back up and running by Thursday evening, about 48 hours after the lightning strike.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2010Every state in 2010This day in weather historyWarnings in Missouri, October 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: 264034.