As a cold front moved out of the Ohio Valley Region and into Middle Tennessee during the late afternoon hours, the atmosphere ahead of the front remained unstable due to southerly low level flow. With daytime heating influences and upper level disturbances passages in northwesterly flow aloft occurring also, thunderstorms developed across the mid state during the afternoon hours.
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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 OHX wrote it up.
As a cold front moved out of the Ohio Valley Region and into Middle Tennessee during the late afternoon hours, the atmosphere ahead of the front remained unstable due to southerly low level flow. With daytime heating influences and upper level disturbances passages in northwesterly flow aloft occurring also, thunderstorms developed across the mid state during the afternoon hours. One of these thunderstorms produced damaging thunderstorm winds in Fentress County.
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 Jul 25, 1:42 PM CST, 1 hour 52 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NASHVILLE TN 242 PM CDT SAT JUL 25 2009 .DISCUSSION... WILL GENERALLY GO WITH A EURO/NAM/GFS MODEL CONSENSUS THRU FORECAST PERIOD. FORECAST QUANDARIES...TIMING OF COLD FRONTAL MOVEMENT TOWARD MID STATE TONIGHT AND THROUGH THE MID STATE ON MON THE KEY IN UPCOMING FORECAST. AS OF THIS TIME...EXPECT FRONT TO BE JUST NORTH OF THE MID STATE BY 12Z SUN. WILL MENTION ISOLATED CONVECTION THIS EVENING WITH SCATTERED SHOWERS/TSTMS AFTER MIDNIGHT. COLD FRONT SHOULD BE POSITIONED ACROSS THE MID STATE BY SUN EVENING. WILL GO WITH CHANCE POPS FOR SUN ACROSS THE ENTIRE MID STATE WITH HIGHEST VALUES NORTH. COLD FRONT SLIPS OUT OF THE MID STATE SUN NIGHT AND MON AS UPPER TROUGH AXIS MOVES EAST. EXPECTED TO BE MORE ISOLATED SHOWERS/TSTMS SUN NIGHT JUST BEHIND FRONT DUE TO POST FRONTAL MOISTURE CONVERGENCE. WILL GO WITH ISOLATED POPS ON MON...AS I AM CAUTIOUS IN GFS/NAM CLEARING US OUT ON MON AS IT MOVES THE FRONT WELL SOUTH OF THE AREA AND THUS LEANING TOWARD A MORE REASONABLE EURO SOLUTION IN THIS CASE. BOUNDARY TO THE SOUTH SEEMS TO FIZZLE ON TUE AS BERMUDA HIGH STRENGTHENS. HOWEVER...ANOTHER BOUNDARY APPROACHES FROM THE NORTH THROUGH MID-WEEK THEN ENTERS THE NW OF THE MID STATE POSSIBLY LATER ON THU. THIS PROCESS ALONG WITH A MORE LESS LONG-WAVE MID LEVEL TO UPPER LEVEL TROUGH WILL KEEP MEAN MOISTURE AXIS IN THE IMMEDIATE VICINITY FROM MID-WEEK INTO THE WEEKEND AND THUS WILL CONTINUE POPS THROUGH THAT PERIOD. && .PRELIMINARY POINT TEMPS/POPS... NASHVILLE 69 85 67 88 / 30 50 20 20 CLARKSVILLE 70 82 64 88 / 30 50 20 20 CROSSVILLE 65 77 64 81 / 30 40 30 20 COLUMBIA 69 85 67 87 / 20 40 20 20 LAWRENCEBURG 70 85 67 87 / 20 30 30 20 WAVERLY 70 83 65 88 / 30 50 20 20 && .OHX WATCHES/WARNINGS/ADVISORIES... NONE. && 31/JBW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NASHVILLE TN 955 AM CDT SAT JUL 25 2009 TNZ005>011-022>034-056>066-075-077>080-093>095-261030- 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-DEKALB-WHITE- CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE- GILES- 955 AM CDT SAT JUL 25 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE. .DAY ONE...TODAY AND TONIGHT ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE TODAY AND TONIGHT. A FEW REPORTS OF DAMAGING WINDS AND LARGE HAIL ARE EXPECTED THIS AFTERNOON AND TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE SUNDAY AS A COLD FRONT MOVES INTO MIDDLE TENNESSEE. THE FRONT IS EXPECTED TO BECOME STATIONARY SOUTH OF MIDDLE TENNESSEE SUNDAY NIGHT. .SPOTTER INFORMATION STATEMENT... DUE TO THE BRIEF AND ISOLATED NATURE OF POSSIBLE SEVERE WEATHER... SPOTTER ACTIVATION IS NOT ANTICIPATED. 04
The Knoxville radar (KMRX), 144 km away, was scanning. The volume nearest the first event began at 21:33 UTC.
1 thunderstorm wind. Local standard time, as filed.
Tree fell on a car which resulted in a woman getting injured. Extent of injuries to woman unknown.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2009Every state in 2009This day in weather historyWarnings in Tennessee, July 2009
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 2026-10-01. Each event’s entry at NCEI: 187097.