A squall line developed along a strong cold front as it moved east across eastern Kansas. Portions of the squall line developed bow segments which produced strong winds with reports up to 80mph.
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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 SGF wrote it up.
A squall line developed along a strong cold front as it moved east across eastern Kansas. Portions of the squall line developed bow segments which produced strong winds with reports up to 80mph. Numerous reports of wind damage were received as the storms moved through the region.
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 Springfield, MO wrote its last area forecast discussion before the first event at Sep 7, 9:39 AM CST, 4 hours 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SPRINGFIELD MO 1039 AM CDT FRI SEP 7 2012 ...MESOSCALE CONVECTIVE DISCUSSION... .UPDATE... /ISSUED 1030 AM CDT FRI SEP 7 2012/ A COMPLEX FORECAST SCENARIO CONTINUED TO TAKE SHAPE THIS MORNING AHEAD OF A POSITIVE TILT UPPER TROUGH THAT STRETCHED ACROSS THE NORTHERN TIER OF THE U.S. A SURFACE LOW WAS LOCATED OVER NORTH CENTRAL MISSOURI WITH COLD FRONT EXTENDING TO THE SOUTHWEST ACROSS SOUTHEASTERN KANSAS INTO NORTH CENTRAL OKLAHOMA. THIS FRONT WILL PUSH STEADILY SOUTH IN THE WAKE OF THE SURFACE LOW TRACING ACROSS NORTHERN MISSOURI. THE FRONT WILL REACH THE INTERSTATE 44 CORRIDOR BY MID AFTERNOON. WILL ALSO BE MONITORING A MINOR SHORTWAVE TRACKING FROM NORTHEASTERN OKLAHOMA AND ACROSS SOUTHERN MISSOURI THIS AFTERNOON. EXPECT CONVECTION TO INITIALLY INCREASE TO OUR WEST BEHIND THE FRONT AS THE SYNOPTIC SCALE SUPPORT SHIFTS SOUTHWARD AND INTERACTS WITH THE FRONT. WIDESPREAD SHOWERS AND THUNDERSTORMS SHOULD DEVELOP WITH TIME BEHIND THE FRONT AS IT PROGRESSES TO THE SOUTH INTO THE REGION. SCATTERED THUNDERSTORMS TO NUMEROUS WILL ALSO DEVELOP THIS AFTERNOON AHEAD OF THE FRONT AND ESPECIALLY IN ADVANCE OF THE MINOR SHORTWAVE TRACKING TOWARD SOUTH CENTRAL MISSOURI. AMPLE SURFACE HEATING AHEAD OF THE FRONT WILL RESULT IN MODERATE INSTABILITY. DEEP LAYER SHEAR WILL INCREASE WITH TIME AS THE UPPER TROUGH GRADUALLY DIGS TO THE SOUTH. ULTIMATELY THE THE RISK FOR SEVERE STORMS WILL EXIST AHEAD OF THE FRONT AND PRIMARILY ALONG AND SOUTHEAST OF THE INTERSTATE 44 CORRIDOR. THE COVERAGE AND TIMING OF RAIN HAS BEEN ADJUSTED IN THE FORECAST. FOSTER && .DISCUSSION... GOOD MORNING TO EVERYONE ACROSS EXTREME SOUTHEAST KANSAS AND THE MISSOURI OZARKS. THE NATIONAL WEATHER SERVICE WILL CLOSELY MONITOR FOR THE RISK OF STRONG TO SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING. A FEW OF THESE STORMS WILL HAVE THE POTENTIAL TO PRODUCE LARGE HAIL THE SIZE OF HALF DOLLARS...AND WIND GUSTS UP TO 65 MPH. LETS NOT FORGET ABOUT CLOUD TO GROUND LIGHTNING...ESPECIALLY WITH ALL THE FRIDAY NIGHT LIGHTS...AND ANY OTHER OUTDOOR ACTIVITIES THAT WILL BE TAKING PLACE THIS EVENING. THESE STORMS ARE EXPECTED TO DEVELOP ACROSS EASTERN KANSAS LATE THIS MORNING...AND MOVE INTO WESTERN MISSOURI BY 2 PM. THE WINDOW FOR SEVERE WEATHER APPEARS TO RANGE FROM 2PM TO 7PM. THE MORE INTENSE STORMS ARE EXPECTED TO EXIT SOUTH CENTRAL MISSOURI BY 7PM. PLEASE NOTE THAT REDEVELOPMENT OF NON-SEVERE SHOWERS AND THUNDERSTORMS IS A POSSIBILITY AFTER 7PM THIS EVENING BEHIND THE FRONT. THIS TIMING IS SLIGHTLY FASTER THAN PREVIOUSLY THOUGHT...AS MODELS HAVE TRENDED TOWARD A FASTER FRONTAL PASSAGE. REGARDING THIS AFTERNOON'S ENVIRONMENT...POINT FORECAST SOUNDINGS SUGGEST THAT MIXED LAYER PARCELS WILL HAVE 2000 - 2500 J/KG OF CAPE. INSTABILITY LEVELS SHOULD BE GREATER OVER THE EASTERN OZARKS. THIS INSTABILITY IN CONJUNCTION WITH INCREASING DEEP LAYER SHEAR OF AROUND 30 KNOTS...WILL BE SUFFICIENT FOR A FEW STORMS TO PRODUCE LARGE HAIL AND DAMAGING WINDS. WE FOLLOWED THE ECMWF OUTPUT FOR MAX TEMPERATURES TODAY...WITH HIGHS IN THE UPPER 80S AND LOWER 90S. WE FOLLOWED HPC'S GUIDANCE WITH RAINFALL AMOUNTS...RANGING FROM ONE HALF OF AN INCH TO AROUND ONE INCH. THESE AMOUNTS SHOULD BE WIDESPREAD ACROSS THE REGION. ALL RAINFALL WILL EXIT THE OZARKS BY MIDNIGHT TONIGHT. FANTASTIC WEATHER IS EXPECTED THROUGH THE REST OF THE WEEKEND. CONDITIONS COULDN'T GET ANY BETTER FOR A LATE SUMMER CAMPING TRIP...OR MAYBE A ROUND OF GOLF. OVERNIGHT LOWS SATURDAY AND SUNDAY WILL FALL INTO THE 50S. MEANWHILE...AFTERNOON HIGHS ON SATURDAY WILL ONLY WARM INTO THE 70S...WITH LOWER 80S EXPECTED ON SUNDAY. HUMIDITY LEVELS WILL BE LOW THROUGH THE WEEKEND...MAKING THE AIR FEEL GREAT. THESE FALL LIKE CONDITIONS WILL OCCUR IN RESPONSE TO DEEP NORTHWEST FLOW EVOLVING ACROSS MUCH OF THE NATIONS MID SECTION. UPPER LEVEL RIDGING WILL BECOME MORE ESTABLISHED LATE SUNDAY INTO MONDAY...FACILITATING A RETURN OF SOUTHERLY BREEZES AT THE SURFACE. THIS UPPER RIDGING PATTERN IS FAVORABLE FOR A WARMING TREND FROM SUNDAY THROUGH ALL OF NEXT WEEK. AS A MATTER OF FACT...IT'S LOOKING LIKE TEMPERATURES IN THE MIDDLE 90S CAN NOT BE RULED OUT BY NEXT WEDNESDAY...AS THE ECMWF AND THE GFS SIGNAL THE RETURN OF A SUMMERTIME HIGH DIRECTED OVER SOUTHERN MISSOURI. REGARDING PRECIPITATION CHANCES IN THE EXTENDED FORECAST...WE HAVE A FAIRLY HIGH DEGREE OF CONFIDENCE IN A DRY WEATHER WILL BE THE RULE FROM SATURDAY THROUGH WEDNESDAY OF NEXT WEEK. HAVE A GREAT WEEKEND ! CRAMER && .AVIATION... /ISSUED 645 AM CDT FRI SEP 7 2012/ FOR THE 07/1200Z KSGF/KJLN/KBBG TAFS...THE MAIN CONCERNS WILL BE WITH A STRONG COLD FRONT PASSING THROUGH THE REGION BETWEEN 07/1800Z AND 08/0000Z. THUNDERSTORMS ARE EXPECTED TO BECOME MORE WIDESPREAD ALONG THE FRONT AS INSTABILITY INCREASES THIS AFTERNOON. MUCH OF THE RAINFALL WILL OCCUR NEAR AND BEHIND THE FRONT. AS TEMPERATURES COOL...POST FRONTAL CEILINGS WILL LOWER INTO AT LEAST THE MVFR CATEGORY...POSSIBLY BRIEFLY BECOMING IFR. ALSO EXPECT BRIEF PERIODS OF IFR VISIBILITY IN HEAVIER SHOWERS. GUSTY NORTH WINDS WILL OCCUR BEHIND THE FRONT...DIMINISHING LATE IN THE TAF PERIOD. DSA && .SGF WATCHES/WARNINGS/ADVISORIES... MO...NONE. KS...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SPRINGFIELD MO 1257 PM CDT FRI SEP 7 2012 KSZ073-097-101-MOZ055>058-066>071-077>083-088>098-101>106-081800- BOURBON-CRAWFORD-CHEROKEE-BENTON-MORGAN-MILLER-MARIES-VERNON- ST. CLAIR-HICKORY-CAMDEN-PULASKI-PHELPS-BARTON-CEDAR-POLK-DALLAS- LACLEDE-TEXAS-DENT-JASPER-DADE-GREENE-WEBSTER-WRIGHT-NEWTON- LAWRENCE-CHRISTIAN-DOUGLAS-HOWELL-SHANNON-MCDONALD-BARRY-STONE- TANEY-OZARK-OREGON- 1257 PM CDT FRI SEP 7 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE MISSOURI OZARKS AND EXTREME SOUTHEAST KANSAS. .DAY ONE...THIS AFTERNOON AND TONIGHT. WEATHER HAZARDS EXPECTED... ELEVATED HAIL RISK. ELEVATED THUNDERSTORM WIND DAMAGE RISK. SIGNIFICANT LIGHTNING RISK. DISCUSSION... SCATTERED TO NUMEROUS THUNDERSTORMS WILL DEVELOP LATER THIS AFTERNOON ALONG AND AHEAD OF AN APPROACHING COLD FRONT. SOME OF THESE STORMS WILL BECOME STRONG TO SEVERE CAPABLE OF PRODUCING LARGE HAIL UP TO THE SIZE OF HALF DOLLARS...DAMAGING WIND GUSTS UP TO 65 MPH...AND FREQUENT CLOUD TO GROUND LIGHTNING. THE GREATEST RISK FOR SEVERE WEATHER WILL OCCUR BETWEEN 3 AND 9 PM ALONG AND SOUTHEAST OF THE INTERSTATE 44 CORRIDOR. WHILE GENERAL SHOWERS AND THUNDERSTORMS WILL OCCUR BEHIND THE COLD FRONT THROUGH MIDNIGHT TONIGHT...THE RISK FOR SEVERE STORMS IS EXPECTED TO END BY 9 PM. HOWEVER THE RISK OF FREQUENT CLOUD TO GROUND LIGHTNING WILL CONTINUE INTO THE EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND EVENING ACROSS SOUTHERN MISSOURI. && THIS PRODUCT IS NOW AVAILABLE IN GRAPHICAL FORMAT...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND CLIMATE INFORMATION...AT HTTP://WWW.CRH.NOAA.GOV/SGF(ALL LOWERCASE) FOSTER
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
902 AM CDT FRI SEP 07 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0325 PM TSTM WND DMG 3 SSE MONTAUK 37.40N 91.66W
09/06/2012 TEXAS MO LAW ENFORCEMENT
TREES DOWN AND BLOCKING THE ROAD NEAR HIGHWAY B AND
HIGHWAY AY.
&&
KARDELLPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
929 AM CDT FRI SEP 07 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM TSTM WND DMG 3 N TANEYVILLE 36.78N 93.03W
09/06/2012 TANEY MO LAW ENFORCEMENT
NEW BARN DESTROYED NEAR ESSARY AND MIDDLETON ROADS
&&
GAEDEPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1152 AM CDT FRI SEP 07 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0115 PM TSTM WND DMG CLIMAX SPRINGS 38.10N 93.05W
09/06/2012 CAMDEN MO PUBLIC
A FEW LARGE TREES AND NUMEROUS 4 INCH LIMBS DOWN
&&
KARDELLThe Pleasant Hill radar (KEAX), 110 km away, was scanning. The volume nearest the first event began at 19:44 UTC.
10 thunderstorm wind. Local standard time, as filed.
Numerous trees and power lines were reported down.
Numerous trees, power lines, and poles were reported down.
Numerous trees and power poles along with power lines were blown down.
Several power lines were blown down in Girard. Winds were estimated between 60 to 70 mph and pea sized hail was also reported.
A 70 mph wind gust was reported at Highway 13 and Highway 32.
Power lines were blown down in Pittsburg.
A 60 mph wind gust was estimated.
Power poles and lines were reported down due to fallen trees.
Several utility poles were knocked down.
A 70 mph wind gust was measured at Highway 13 and Highway 32.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2012Every state in 2012This day in weather historyWarnings in Kansas, 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: 404953, 404954, 407020, 404955, 404959, 404956, 404960, 404957, 404958, 407021.