Scattered thunderstorms developed across portions of Middle Tennessee during the afternoon hours. One storm produced wind damage on Percy Priest Lake.
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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.
Scattered thunderstorms developed across portions of Middle Tennessee during the afternoon hours. One storm produced wind damage on Percy Priest Lake.
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 Aug 25, 1:43 PM CST, 18 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NASHVILLE TN 243 PM CDT SAT AUG 25 2012 .DISCUSSION... MID STATE SANDWICHED BETWEEN WEAK UPPER TROUGH TO OUR WEST AND CLOSED LOW TO OUR EAST OVER NORTH CAROLINA. UPPER RIDGE SEEMS TO BE SUPPRESSING CONVECTION FOR THE MOST PART BUT ISOLATED SHOWERS/STORMS HAVE DEVELOPED GENERALLY ALONG AND WEST OF INTERSTATE 65 THIS AFTERNOON...CLUSTERING IN AREA OF BEST UPPER DIFFLUENCE. EXPECT SOME ACTIVITY TO CONTINUE INTO THE FIRST PART OF THE EVENING. UPPER RIDGE BUILDS IN ON SUNDAY BUT STILL THINK SLIGHT CHANCE FOR SHOWERS/STORMS WILL EXIST WESTERN AREAS...ESPECIALLY AFTERNOON. UPPER RIDGE STRENGTHENS ON MONDAY OVER TENNESSEE VALLEY AS UPPER TROUGH APPROACHES FROM THE NORTHWEST. HAVE INCLUDED A SMALL CHANCE FOR SHOWERS/STORMS FOR MONDAY INTO TUESDAY...IN RESPONSE TO UPPER TROUGH...BUT THINK SUBSIDENCE OUT AHEAD OF ISAAC WILL TRY AND SUPPRESS DEVELOPMENT...ESPECIALLY OVER THE NORTH. HPC/HURRICANE CENTER BRINGS ISAAC NORTHWARD INTO SOUTH ALABAMA EARLY WEDNESDAY AND CONTINUES THE SYSTEM NORTH AND INTO MIDDLE TENNESSEE BY THURSDAY NIGHT/FRIDAY...AND INTO NORTH CENTRAL KENTUCKY BY EARLY SATURDAY. THE REMNANTS OF PAST TROPICAL SYSTEMS THAT MOVE NORTH FROM THE GULF REGION HAVE A HISTORY OF BRINGING HEAVY RAINFALL INTO MIDDLE TENNESSEE. FEDERIC IN 1979 BROUGHT MORE THAT 6.50 INCHES OF RAIN TO MIDDLE TENNESSEE IN A 24 HOUR PERIOD AS IT MOVED NORTH FROM SOUTH ALABAMA. BOYD && .PRELIMINARY POINT TEMPS/POPS... NASHVILLE 67 91 70 92 / 20 10 10 10 CLARKSVILLE 65 90 68 90 / 20 20 20 20 CROSSVILLE 59 86 65 88 / 20 0 05 05 COLUMBIA 67 91 70 92 / 20 20 05 10 LAWRENCEBURG 65 91 67 92 / 20 20 05 10 WAVERLY 66 90 69 91 / 20 20 10 10 && .OHX WATCHES/WARNINGS/ADVISORIES... NONE. && BOYD
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NASHVILLE TN 502 AM CDT SAT AUG 25 2012 TNZ005>011-022>034-056>066-075-077>080-093>095-261000- 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- 502 AM CDT SAT AUG 25 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. 31
The Nashville radar (KOHX), 14 km away, was scanning. The volume nearest the first event began at 20:03 UTC.
1 thunderstorm wind. Local standard time, as filed.
A few docks and boats were damaged at Elm Hill Marina. A dock employee estimated winds up to 35 mph.
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, August 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: 398551.