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, 2:54 PM CST, 1 hour 36 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 354 PM CDT THU SEP 6 2012 .SHORT TERM... ISSUED AT 351 PM CDT THU SEP 6 2012 (TONIGHT THROUGH SATURDAY) SHORTWAVE SLIDING EAST ALONG WEAKENING FRONTAL BOUNDARY...SOUTH OF I-70...SO STRONG TO SEVERE STORMS ASSOCIATED WITH IT TO MOVE EAST TAPERING OFF EARLY THIS EVENING...SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM FOR THIS AREA. OTHERWISE...DEALING WITH NEXT WEATHER SYSTEM AS COLD FRONT AND SIGNIFICANT SHORTWAVE THAT IS SLIDING SOUTH OUT OF SOUTHWESTERN CANADA. SURFACE LOW AND COLD FRONT TO MOVE INTO NORTHEASTERN MO BY 12Z FRIDAY...WITH SOME DECENT LOW LEVEL MOISTURE AND CAPES NEAR 1000 J/KG. SO WILL SEE SHOWERS AND THUNDERSTORMS DEVELOP OVER NORTHERN MO AND INCREASE IN COVERAGE AFTER MIDNIGHT...SPREADING SOUTHEAST THROUGH FORECAST AREA. BEST CHANCES OF RAIN WITH THIS SYSTEM WILL BE FRIDAY AND FRIDAY NIGHT AS THE STRONG SHORTWAVE SLIDES THROUGH...WITH A SLIGHT RISK OF SEVERE WEATHER WITH CAPES IN EXCESS OF 3000 J/KG AND PLENTY OF DEEP LAYER SHEAR...SO SPC HAS PUT FORECAST AREA IN A SLIGHT RISK. SYSTEM QUICKLY EXITS REGION LATE FRIDAY EVENING...SO BACKED OFF POPS AFTER 06Z SATURDAY...WITH FORECAST AREA DRYING OUT BY 12Z SATURDAY. LOWS TONIGHT TO REMAIN RATHER MILD...IN THE UPPER 60S TO LOW 70S. AS FOR HIGHS ON FRIDAY...WILL DEPEND ON CLOUD COVER AND STORMS...FOR NOW HAVE UPPER 70S TO UPPER 80S. THEN DECENT CAA TO MOVE INTO AREA ON BACKSIDE OF SYSTEM. LOWS FRIDAY NIGHT WILL BE IN THE LOW 50S FAR NORTH TO THE UPPER 50S FAR SOUTHEAST. COOL FALL WEATHER IN STORE ON SATURDAY WITH HIGHS ONLY IN THE LOW TO MID 70S. BYRD && .LONG TERM... ISSUED AT 351 PM CDT THU SEP 6 2012 (SATURDAY NIGHT THROUGH THURSDAY) NO MAJOR CHANGES TO THE EXTENDED AS COOL AND DRY WEATHER TO PERSIST THROUGH THE REST OF THE WEEKEND...THEN TEMPS TO SLOWLY MODERATE THROUGH NEXT WEEK. SATURDAY NIGHT WILL BE OUR COOLEST NIGHT WITH LOWS IN THE LOW 50S. ON SUNDAY SURFACE RIDGE BEGINS TO MOVE OFF TO THE EAST ALLOWING A SLOW WARMUP. HIGHS ON SUNDAY WILL BE IN THE UPPER 70S...WARMING UP INTO THE LOW TO MID 80S BY WEDNESDAY. EXTENDED MODELS SHOWING A COLD FRONT TO APPROACH THE REGION WEDNESDAY NIGHT AND THURSDAY...BUT CONFIDENCE IS LOW ON TIMING...SO FOR NOW THIS PERIOD DRY...WITH JUST SILENT SLIGHT CHANCE POPS ON THURSDAY. BYRD && .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 409 PM 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>075-084-085-099-071200- 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- 409 PM 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...TONIGHT THUNDERSTORMS ARE EXPECTED THIS AFTERNOON ACROSS PORTIONS OF SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS...MAINLY ALONG AND SOUTH OF INTERSTATE 70. A FEW OF THE STORMS MAY BE SEVERE WITH DAMAGING WINDS AND LARGE HAIL AS THE MAIN THREATS. 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 WILL BE NEEDED THROUGH EARLY THIS EVENING FOR AREAS ALONG AND SOUTH OF INTERSTATE 70. BYRD
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
454 PM CDT THU SEP 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0453 PM HEAVY RAIN BEAUFORT 38.42N 91.19W
09/06/2012 E2.00 INCH FRANKLIN MO TRAINED SPOTTER
&&
TRUETTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
459 PM CDT THU SEP 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0448 PM TSTM WND GST WATERLOO 38.33N 90.16W
09/06/2012 E45 MPH MONROE IL AMATEUR RADIO
40-45 MPH WINDS WITH OUTFLOW BOUNDARY.
&&
GOSSELINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
503 PM CDT THU SEP 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0414 PM TSTM WND DMG AUGUSTA 38.57N 90.88W
09/06/2012 ST. CHARLES MO TRAINED SPOTTER
ONE AND A HALF FOOT DIAMTER OAK TREE SNAPPED ABOUT 15
FEET UP.
&&
GOSSELINSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 512 PM CDT THU SEP 6 2012 ILZ101-102-062300- MONROE IL-ST. CLAIR IL- 512 PM CDT THU SEP 6 2012 ...SIGNIFICANT WEATHER ADVISORY FOR ST. CLAIR AND NORTHERN MONROE COUNTIES UNTIL 600 PM CDT... AT 509 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR MILLSTADT...MOVING SOUTHEAST AT 25 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... BELLEVILLE... SWANSEA... FREEBURG... SMITHTON... NEW ATHENS... 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. KANOFSKY
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
514 PM CDT THU SEP 06 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0440 PM TSTM WND DMG OAKVILLE 38.44N 90.32W
09/06/2012 ST. LOUIS MO PUBLIC
6 INCH DIAMETER TREE SPLIT...RELAYED THROUGH THE ST.
LOUIS COUNTY EOC
&&
MILLERSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 518 PM CDT THU SEP 6 2012 ILZ059-064-069-074-079-098>101-MOZ061-063-062300- BOND IL-CALHOUN IL-CLINTON IL-JERSEY IL-MACOUPIN IL-MADISON IL-RANDOLPH IL-ST. CHARLES MO-ST. CLAIR IL-ST. LOUIS MO-WASHINGTON IL- 518 PM CDT THU SEP 6 2012 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ST. LOUIS... NORTHEASTERN ST. CHARLES...CLINTON...CALHOUN...SOUTHWESTERN BOND... WASHINGTON...EASTERN ST. CLAIR...NORTHEASTERN RANDOLPH...MADISON... SOUTHERN MACOUPIN AND JERSEY COUNTIES UNTIL 600 PM CDT... AT 513 PM CDT...STORM SPOTTERS REPORTED STRONG WINDS ASSOCIATED WITH A THUNDERSTORM OUTFLOW BOUNDARY. THESE WINDS EXTENDED ALONG A LINE FROM 6 MILES NORTHEAST OF WINFIELD TO ELSAH TO PONTOON BEACH TO MASCOUTAH TO EVANSVILLE...AND WERE MOVING EAST AT 35 MPH. BRIEF WIND GUSTS UP TO 50 MPH ARE EXPECTED WHEN THE OUTFLOW BOUNDARY MOVES THROUGH. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... SCOTT AFB... MASCOUTAH... MARYVILLE... ALTON... LEBANON... GLEN CARBON... WOOD RIVER... GODFREY... SPARTA... TROY... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. KANOFSKY
The St Louis radar (KLSX), 118 km away, was scanning. The volume nearest the first event began at 22:30 UTC.
1 thunderstorm wind. Local standard time, as filed.
A large tree was blown over onto Illinois Route 3 just south of Chester.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2012Every state in 2012This day in weather historyWarnings in Illinois, 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: 413378.