A cold front moved through the region, triggering showers and thunderstorms. There were numerous reports of large hail and damaging winds.
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 through the region, triggering showers and thunderstorms. There were numerous reports of large hail and damaging winds.
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 Sep 6, 12:00 PM CST, 1 hour 31 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 100 PM CDT THU SEP 6 2012 .SHORT TERM... ISSUED AT 332 AM CDT THU SEP 6 2012 (TODAY THROUGH FRIDAY NIGHT) STILL EATING CROW AFTER YESTERDAY'S BUSTED FORECAST...AND IT'S A BITTER BIRD. THE COLD FRONT HAS MADE IT THROUGH KIRKSVILLE BUT IS TAKING ITS TIME DRIFTING THROUGH THE NORTHWEST PORTION OF THE CWFA. CURRENT THINKING IS THAT THE FRONT WILL CONTINUE DRIFTING SOUTHEAST BUT WILL PROBABLY NOT CLEAR THE SOUTHERN PORTION OF THE CWFA BEFORE AFTERNOON. RAP AND HRRR DEVELOP DECENT INSTABILITY IN EXCESS OF 2000 J/KG WITH LITTLE OR NO CAP. HAVE ADDED POPS SOUTH OF THE STL METRO AREA ACROSS THE EASTERN OZARKS. ALSO...SINCE THE COLD AIR ADVECTION IS SOMEWHAT LACKING FROM PREVIOUS FORECASTS...HAVE BUMPED UP TEMPS A COUPLE OF DEGREES TODAY. ATTENTION TURNS TO THE STRONG SHORTWAVE JUST NOW DROPPING INTO THE CONUS FROM SOUTHEAST CANADA AND THE RESULTING STORM WHICH WILL MOVE THROUGH FRIDAY AND FRIDAY NIGHT. THE WAVE'S PRESENTATION ON WATER VAPOR IMAGERY IS PRETTY IMPRESSIVE FOR EARLY SEPTEMBER. THIS IS ENCOURAGING FOR THE FORECAST. LATEST GUIDANCE KEEPS MUCH OF THE AREA DRY TONIGHT...PRETTY MUCH ALL EXCEPT NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS. CAN'T QUITE BRING MYSELF TO PULL POPS OUT OF THE REST OF THE AREA THO...SO HAVE LEFT THEM BE. ALL GUIDANCE HAS THE SHORTWAVE DIVING INTO THE PLAINS FRIDAY MORNING AND THE ASSOCIATED COLD FRONT MOVING THROUGH KIRKSVILLE BY AROUND 18Z. SPC HAS US OUTLOOKED IN A SLIGHT RISK AND THIS LOOKS GOOD GIVEN THAT THE NAM DEVELOPS INSTABILITY IN EXCESS OF 3000 J/KG AND PLENTY OF DEEP LAYER SHEAR. HAVE BUMPED UP POPS TO OCCASIONAL DURING THE AFTERNOON AND EARLY EVENING FOR PARTS OF THE AREA. LATEST GUIDANCE HAS THE FRONT MOVING THOUGH FASTER THAN EARLIER FORECAST...SO HAVE CUT BACK ON POPS AFTER MIDNIGHT. CARNEY && .LONG TERM... ISSUED AT 358 AM CDT THU SEP 6 2012 (SATURDAY THROUGH WEDNESDAY) PRIMARY CHANGE TO THE FORECAST FOR THE LONG TERM IS TO INCREASE HIGH TEMPERATURES A BIT THIS WEEKEND AND EARLY NEXT WEEK. ALL OF THE MODELS DROP A STRONG RIDGE INTO THE AREA THIS WEEKEND BEHIND THE FRONT. WHEN WE INITIALLY BEGAN SEEING THIS STORM SYSTEM IN THE MODELS SEVERAL DAYS AGO...THEY DEVELOPED A CLOSED LOW OVER THE GREAT LAKES/OHIO VALLEY REGION. THE PAST FEW RUNS THE MODELS HAVE BECOME PROGRESSIVE WITH THE WAVE. THIS SHOULD MEAN THAT INSTEAD OF CONSIDERABLE CLOUDS AND WIDELY SCATTERED SHOWERS ON SATURDAY...IT SHOULD BE MOSTLY SUNNY AND DRY. WITH THE MORE PROGRESSIVE SOLUTION...THE WARM UP BACK TO NEAR NORMAL TEMPERATURES SHOULD OCCUR MORE QUICKLY ON SUNDAY INTO EARLY NEXT WEEK. UPPER LEVEL RIDGE BUILDS BACK INTO THE AREA BY TUESDAY. ANOTHER COLD FRONT LOOKS TO BE APPROACHING THE AREA ON WEDNESDAY...BUT HAVE NOT PUT ANY POPS IN THE FORECAST AT THIS TIME AS THE STRONG SURFACE RIDGE WHICH WILL BRING US THIS WEEKEND'S COOL WEATHER LOOKS LIKE IT WILL LAY OUT DOWN ACROSS THE SOUTHERN U.S. AND BLOCK ANY MOIST RETURN FLOW FROM THE GULF. CARNEY && .AVIATION... ISSUED AT 1250 PM CDT THU SEP 6 2012 CLUSTER OF SHOWERS AND THUNDERSTORMS OVER SOUTHWEST MISSOURI IS TRACKING EASTWARD AND IS EXPECTED TO CONTINUE ON THAT COURSE THROUGH THE AFTERNOON. THIS SHOULD KEEP IT SOUTH OF THE TERMINALS...BUT WILL HAVE TO WATCH THE ST LOUIS AREA AS THE FRONT HAS BECOME QUASI-STATIONARY THROUGH EAST CENTRAL MO AND SOUTHWEST ILLINOIS. OTHERWISE VFR CONDITIONS EXPECTED THROUGH LATE TONIGHT. A POTENT COLD FRONT WILL BEGIN TO MOVE INTO NORTHERN MISSOURI AND WEST CENTRAL ILLINOIS ON FRIDAY MORNING. SHOWERS AND THUNDERSTORMS SHOULD BE ONGOING ALONG/AHEAD OF THE FRONT LATE TONIGHT AND SHOULD CONTINUE TO GROW THROUGH THE MORNING AND INTO THE AFTERNOON AS IT MOVES INTO MO AND IL. SPECIFICS FOR KSTL... CLUSTER OF SHOWERS AND THUNDERSTORMS OVER SOUTHWEST MISSOURI IS TRACKING EASTWARD AND IS EXPECTED TO STAY SOUTH OF THE TERMINAL...BUT WILL HAVE TO WATCH CLOSELY AS THE FRONT HAS BECOME QUASI-STATIONARY THROUGH THE ST LOUIS METRO. OTHERWISE VFR CONDITIONS EXPECTED THROUGH AT LEAST MID MORNING ON FRIDAY. SHOWERS AND THUNDERSTORMS ARE EXPECTED ALONG AND AHEAD OF A POTENT COLD FRONT ON FRIDAY...WITH THE BEST CHANCE IN THE 17-21Z TIME FRAME. GLASS && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1159 AM CDT THU SEP 6 2012 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-071115- 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- 1159 AM CDT THU SEP 6 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON ACROSS PORTIONS OF SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS. A FEW OF THE STORMS MAY BE SEVERE WITH DAMAGING WINDS AS THE MAIN THREAT. THUNDERSTORMS ARE LIKELY LATE TONIGHT OVER NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS. THERE IS A CHANCE OF THUNDERSTORMS ACROSS MUCH OF THE REST OF THE AREA. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE WILL BE OCCASIONAL THUNDERSTORMS ON FRIDAY...SOME THUNDERSTORMS WILL LIKELY LINGER INTO FRIDAY NIGHT. SOME OF THE STORMS MAY BE SEVERE. DAMAGING WINDS WILL BE THE PRIMARY SEVERE WEATHER THREAT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON ACROSS SOUTHEAST MISSOURI AND FAR SOUTHWEST ILLINOIS. GLASS
The St Louis radar (KLSX), 136 km away, was scanning. The volume nearest the first event began at 19:31 UTC.
12 thunderstorm wind, 5 hail. Local standard time, as filed.
Thunderstorm winds blew down a large tree blocking County Road 542 just southeast of Meta.
Large hail fell over Potosi. Hail up to half dollar size was reported just northeast of Potosi at the intersection of Highway 21 and Highway E.
Large hail was reported at the intersection of State Highway V and State Highway T.
Thunderstorm winds blew down a large tree branch which briefly blocked Highway T.
Thunderstorm winds blew down two large trees near the intersection of Highways J and H. In Sullivan, several trees were uprooted along service road parallel to I-44.
Thunderstorm winds blew down numerous large tree limbs between Union and Villa Ridge.
Thunderstorm winds snapped a foot and a half diameter oak tree about 15 feet up from its base.
Thunderstorm winds blew down several large tree limbs near the intersection of Highway N and Westlake Village Drive.
Thunderstorm winds blew down several large tree limbs around town.
Thunderstorm winds snapped off an eight inch diameter Bradford Pear tree.
Thunderstorm winds blew down several large tree limbs in High Ridge.
Thunderstorm winds blew down several large trees between Belleview and Ironton.
Thunderstorm winds blew down several large trees between Annapolis and Des Arc. Some of the trees fell onto roadways blocking them. Also, one tree fell onto a house in Annapolis causing moderate damage.
Thunderstorm winds blew down several large tree limbs.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2012Every state in 2012This day in weather historyWarnings in Missouri, September 2012
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: 413359, 413360, 413361, 413362, 413363, 413364, 413367, 413365, 413368, 413369, 413366, 413371, 413370, 413372, 413375, 413376, 413377.