During the late evening hours on Friday, September 7th, across four middle tennessee counties, thunderstorms reached severe thresholds resulting in thunderstorm wind damage.
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 OHX wrote it up.
During the late evening hours on Friday, September 7th, across four middle tennessee counties, thunderstorms reached severe thresholds resulting in thunderstorm wind damage.
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 Nashville, TN wrote its last area forecast discussion before the first event at Sep 7, 8:53 PM CST, 1 hour 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NASHVILLE TN 953 PM CDT FRI SEP 7 2012 .MESOSCALE UPDATE... CONVECTION JUST TO OUR NW WILL BE MOVING INTO FAR NW MIDDLE TN BETWEEN 1030 PM AND 11 PM. LAPS CAPES STILL RATHER IMPRESSIVE FOR THIS TIME OF NIGHT AND VALUES STAND AT BETWEEN 1000 AND 2000 J/KG. HIGHEST CAPES AT 02Z EXTEND FROM SOUTH CENTRAL KY SOUTHWARD AND SOUTHWESTWARD. LI VALUES CONTINUE TO HOLD BETWEEN -4 AND -6. CLOUD TOPS IN ASSOCIATION WITH THE LINE OF STORMS TO OUR NW ARE CONTINUING TO COOL. THUS...NO WEAKENING IS INDICATED. ACCORDING TO THE OHX VWP...SOME SLIGHT INCREASE IN 850 MB FLOW IS INDICATED. DIRECTIONAL SHEER IS MINIMAL HOWEVER THROUGH 10KFT. SPEED SHEAR STILL EXPECTED TO AMPLIFY JUST AHEAD OF THE ADVANCING CONVECTION. OTW...CURRENT FCST IS STILL IN GOOD SHAPE. && .PREV DISCUSSION... /ISSUED 646 PM CDT FRI SEP 7 2012/ UPDATE... 00Z TAF DISCUSSION. AVIATION... LINE OF STORMS OVER SOUTHERN MISSOURI AND NORTHERN ARKANSAS CONTINUES TO RACE EASTWARD AT 50 TO 60 MPH...WITH ADDITIONAL BUT SLOWER MOVING STORMS OUT OF AHEAD OF THE LINE. CURRENT TIME OF ARRIVAL TOOL ESTIMATES ACTIVITY WILL ENTER OUR NORTHWEST COUNTIES IN THE 03-04Z TIMEFRAME. HOWEVER...ADDITIONAL ACTIVITY MAY FORM OUT AHEAD OF THE LINE AND COULD ARRIVE SOONER. BASED ON THIS THINKING...HAVE MADE SLIGHT ADJUSTMENTS TO TIMING OF CONVECTION AT CKV/BNA/CSV OVERNIGHT. MAIN IMPACT AT AIRPORTS WILL BE STRONG WIND GUSTS WITH BOTH INITIAL OUTFLOW FROM STORMS AS WELL AS WITH THE STRONG PRESSURE RISES BEHIND THE LINE...AS NOTED BY THE WIDESPREAD 35-45KT WIND GUSTS ALL ACROSS THE MIDWEST AND SOUTHERN PLAINS. STRATIFORM RAIN/OCCASIONAL TSRA WITH MVFR CIGS/VIS EXPECTED FOR SEVERAL HOURS BEHIND THE MAIN LINE OF STORMS OVERNIGHT...LINGERING INTO TOMORROW MORNING AT CSV. GRADUAL IMPROVEMENT TO VFR ANTICIPATED ON SATURDAY BUT BREEZY NORTH TO NORTHWEST WINDS WITH GUSTS UP TO 25 KNOTS EXPECTED. PREV DISCUSSION... /ISSUED 533 PM CDT FRI SEP 7 2012/ UPDATE... COLD FRONT CURRENTLY STRETCHES FROM CENTRAL IL THROUGH CENTRAL MO AND THROUGH EASTERN OK. PRESSURE RISES/FALLS CLEARLY NOTED BEHIND/AHEAD OF THE BOUNDARY. THUS...COLD FRONT IS MOVING QUICKLY OUR WAY. THE FRONT WILL ENTER OUR NW COUNTIES AROUND 9Z AND THEN CLEAR THE PLATEAU AROUND 15Z. LOOKS AS THOUGH WE WILL SEE SOME PRE FRONTAL FORCING AHEAD OF THE BOUNDARY AND THEN ADDITIONAL FORCING WITH THE ACTUAL FROPA. 850 MB FLOW DOES INCREASE OVERNIGHT AND WILL LIKELY ADD TO THE SEVERE WEATHER POTENTIAL OVER OUR NW AREAS. SEVERE WEATHER POTENTIAL NOT AS GREAT ACROSS OUR SOUTHEAST. THE BETTER UPPER LEVEL ENERGY WILL SHIFT NORTHWARD AFTER 12Z AS THE FRONT IS MOVING THROUGH. FOR THE FCST...NO CHANGES FOR NOW. I WILL...HOWEVER...BE REISSUING ZONES SHORTLY SO AS TO REMOVE THE LATE AFTERNOON GROUP. I MAY MAKE A SLIGHT TWEAK AND DELAY THE ONSET OF LIKELY CONVECTION ACROSS OUR NORTHWEST. BUT...WE ARE NOW STARTING TO SEE SOME INITIAL PRE FRONTAL CONVECTION IN FAR SW KY. UPDATED FCST WILL BE SENT WITHIN THE NEXT HALF HOUR OR SO. PREV DISCUSSION... /ISSUED 328 PM CDT FRI SEP 7 2012/ DISCUSSION... FORECAST REASONING WILL LEAN TOWARD A CONSENSUS MODEL SOLUTION COMPROMISE FOR THE FORECAST PERIOD UNLESS OTHERWISE NOTED. FORECAST QUANDARIES...POTENTIAL STRONG COLD FRONTAL PASSAGE IMPACTS TONIGHT THRU THE MORNING HRS ON SAT...TEMPS. WILL BE UP TO PRESS TIME MAKING ADJUSTMENTS TO THE SUITE OF FORECAST PRODUCTS THAT WILL BE ISSUED PER REGIONAL SATELLITE...SFC OBS...AND RADAR TRENDS...AND WILL ALSO BREAK OUT A LATE AFTERNOON GROUPING IN THE ZONE PRODUCT ITSELF. THE CONSENSUS OF THE MODEL SOLUTIONS ARE IN CLOSE AGREEMENT...WITH THE SFC FRONT AS OF 19Z STRETCHING FROM NEAR THE SRN TIP OF LAKE MI TO SEWD THRU N TX...THAT THE BULK OF THE IMPACT ASSOCIATED WITH THE SFC FRONTAL/UPPER LEVEL TROUGH PASSAGE EVENT WILL OCCUR AROUND OR AFTER MIDNIGHT THRU THE MORNING HRS ON SAT. EXPECT A SLIGHT CHANCE TO CHANCE OF SHWRS/TSTMS TO LINGER ACROSS LOCATIONS JUST W OF AND ACROSS THE PLATEAU THRU SAT AFTERNOON. THE BEST POTENTIAL OF PCPN ASSOCIATED WITH THIS EVENT WILL OCCUR AROUND OR AFTER MIDNIGHT TOO. LATEST HPC QPF VALUES SHOW AROUND ONE INCH ACROSS THE LAND BETWEEN THE LAKES REGION OF NW MID TN TO AROUND A HALF OF AN INCH ACROSS THE PLATEAU FROM TONIGHT THRU THE AFTERNOON HRS ON SAT. EXPECT THE DEVELOPING CONVECTION AS OF 20Z OVER NRN MO NEAR THE FRONTAL ZONE TO EVENTUALLY TRACK SEWD INTO WRN PORTIONS OF THE MID STATE THIS EVENING. THE SLIGHT RISK FOR SVR TSTMS FOR TONIGHT HAS BEEN MOVED SLIGHTLY W AS THE DAY HAS PROGRESSES...AND INCLUDES THE NW HALF OF THE MID STATE. STILL BELIEVE THAT THERE WILL BE THE POTENTIAL FOR SOME STRONG TO SVR TSTMS...AS GREATEST MOISTURE POOLING WILL OCCUR JUST AHEAD AND ALONG THE FRONT...BUT THE OVERALL POTENTIAL FOR STRONG TO SVR TSTMS WILL DIMINISH AS THE NIGHT TIME HRS PROGRESS. AS FOR TEMPS...WILL KEEP LOWS TONIGHT IN THE UPPER 60S TO EVEN THE LOWER 70S IN THE NASHVILLE METRO AREA DUE TO THE INCREASED CLOUD COVERAGE...BUT EXPECT A SIGNIFICANT COOLING TREND ON HIGHS TO TAKE PLACE ON SAT...WITH HIGHS ONLY EXPECTED ONLY IN THE MID 70S N TO AROUND 80 S...MID 70S PLATEAU AS STRONG RIDGING INFLUENCES BEGIN TO BUILD INTO THE MID STATE. AS FOR THE REST OF THE FORECAST PERIOD...RIDGING INFLUENCES SFC/ALOFT WILL CONTINUE TO BUILD AND PROVIDE FOR PLEASANT AND DRY WX FROM SAT NIGHT THROUGH THE VAST MAJORITY OF NEXT WEEK. HIGH TEMPS WILL ONLY BE IN THE UPPER 70S...MID 70S PLATEAU ON SAT...EVENTUALLY WARMING UP INTO THE MID 80S...AROUND 80 PLATEAU BY LATE NEXT WEEK. LOWS WILL BE IN THE 50S ON SAT AND SUN NIGHTS...MAYBE EVEN SOME PATCHES OF UPPER 40S ACROSS THE ELEVATED VALLEYS OF THE PLATEAU WILL ALSO BE POSSIBLE THESE TWO NIGHTS ALSO...AND EVEN LOWS WILL ONLY WARM INTO THE LOWER 60S...UPPER 50S PLATEAU BY THE END OF NEXT WEEK ALSO. && .OHX WATCHES/WARNINGS/ADVISORIES... NONE. && 21
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NASHVILLE TN 500 AM CDT FRI SEP 7 2012 TNZ005>011-022>034-056>066-075-077>080-093>095-081000- STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON- HOUSTON-HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE- SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS- WILLIAMSON-MAURY-MARSHALL-RUTHERFORD-CANNON-DE KALB-WHITE- CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE- GILES- 500 AM CDT FRI SEP 7 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR MOST OF THE MIDSTATE FOR TONIGHT. A STRONG COLD FRONT WILL MOVE INTO THE AREA TONIGHT. AHEAD OF THE FRONT...SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS. A FEW THUNDERSTORMS MAY BE SEVERE WITH DAMAGING WINDS AND LARGE HAIL. ALSO...STORMS MAY HAVE HEAVY RAINFALL AND FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER CALL TO ACTION STATEMENT... REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED. SPOTTER THUNDERSTORM REPORTING CRITERIA... TORNADO FUNNEL CLOUD FLOODING HAIL >= 1/2 INCH WINDS > 50 MPH (MEASURED) STRUCTURAL DAMAGE TREES OR POWER LINES DOWN JLM
The national radar mosaic for the moment the first event began.
6 thunderstorm wind. Local standard time, as filed.
Two trees were downed on Stoney Point Road 4 miles east of Erin.
A tree was downed in the city of Palmyra.
County 911 dispatch reported multiple trees were downed across several locations across the county.
Power lines were reported downed by 911 county dispatch near the intersection of Ashland City Road and Excell Road.
Deputy found a large tree limb downed that was blocking a roadway.
Several trees were downed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2012Every state in 2012This day in weather historyWarnings in Tennessee, 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: 409518, 409396, 409493, 409499, 409398, 409397.