Numerous showers and thunderstorms developed across Middle Tennessee during the late morning to afternoon hours on August 12. Wind damage, hail, and flood reports were received.
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.
Numerous showers and thunderstorms developed across Middle Tennessee during the late morning to afternoon hours on August 12. Wind damage, hail, and flood reports were received.
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 12, 12:10 PM CST, 14 minutes earlier.
Area Forecast Discussion National Weather Service Nashville TN 110 PM CDT Wed Aug 12 2020 .UPDATE... FOR 18Z AVIATION DISCUSSION. && .DISCUSSION... Latest CAMs showing quite a bit of development across the area the is afternoon...especially around the I-65 corridor and west. CAPE going above 2000 this afternoon, with shear remaining very low end. Could see a few strong storms, with gusty wind late today. Realigned POPs slightly. Temps also running a little warm this morning, also raised across the board a degree or two. && .AVIATION... 18Z TAF DISCUSSION. TS impacting BNA and approaching CKV at TAF time. Expect additional TS to develop thru 00z at all sites, with the greatest risk at CKV/BNA/MQY. Brief MVFR/IFR VIS and gusty winds are possible with the heavier activity. Overnight, BR/FG will develop after 07z-08z, especially where rain fell this afternoon. This will dissipate after 12z-13z Thu, lending to more afternoon storms near the sites after 18z. && .OHX WATCHES/WARNINGS/ADVISORIES... NONE. && DISCUSSION......07 AVIATION........Schaper
Hazardous Weather Outlook National Weather Service Nashville TN 510 AM CDT Wed Aug 12 2020 TNZ005>011-023>034-056>066-075-077>080-093>095-131000- Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-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- 510 AM CDT Wed Aug 12 2020 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...Thursday through Tuesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. JB Wright
Special Weather Statement
National Weather Service Nashville TN
1253 PM CDT Wed Aug 12 2020
TNZ008-027-028-121815-
Davidson TN-Wilson TN-Sumner TN-
1253 PM CDT Wed Aug 12 2020
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL DAVIDSON...SOUTHWESTERN
SUMNER AND WEST CENTRAL WILSON COUNTIES UNTIL 115 PM CDT...
At 1252 PM CDT, Doppler radar was tracking a strong thunderstorm near
Nashville, moving east at 15 mph.
Winds in excess of 40 mph will be possible with this storm.
Locations impacted include...
Nashville, Madison, Hendersonville, Mount Juliet, Goodlettsville,
Forest Hills, Oak Hill, Belle Meade, Lakewood, Hermitage, Rural Hill,
Old Hickory, Berry Hill, Green Hill, Whites Creek and Percy Priest
Lake.
This includes the following highways...
Interstate 40 between mile markers 204 and 225.
Interstate 65 between mile markers 77 and 96.
Interstate 24 between mile markers 40 and 57.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3610 8651 3610 8652 3607 8652 3607 8653
3608 8653 3608 8654 3609 8655 3607 8655
3605 8687 3628 8687 3634 8654
TIME...MOT...LOC 1752Z 264DEG 12KT 3619 8673
RoseSpecial Weather Statement
National Weather Service Nashville TN
105 PM CDT Wed Aug 12 2020
TNZ007-026-121830-
Robertson TN-Cheatham TN-
105 PM CDT Wed Aug 12 2020
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CHEATHAM AND WESTERN
ROBERTSON COUNTIES UNTIL 130 PM CDT...
At 105 PM CDT, Doppler radar was tracking a strong thunderstorm near
Coopertown, or 9 miles west of Springfield. This storm was nearly
stationary.
Winds in excess of 40 mph will be possible with this storm.
Locations impacted include...
Springfield, Coopertown, Pleasant View, Adams and Cedar Hill.
This includes Interstate 24 between mile markers 18 and 29.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3662 8695 3638 8686 3637 8686 3637 8688
3639 8689 3639 8691 3636 8691 3635 8708
3645 8713 3646 8712 3647 8713 3652 8711
3654 8712
TIME...MOT...LOC 1805Z 251DEG 3KT 3646 8704
RoseThe Nashville radar (KOHX), 17 km away, was scanning. The volume nearest the first event began at 18:21 UTC.
4 thunderstorm wind, 1 hail, 1 flood. Local standard time, as filed.
A tree was blown down on Eastland Avenue near 16th and 17th Street in east Nashville.
A power line was blown down on Greenwood Avenue in east Nashville.
Twitter tSpotter photos showed penny to nickel size hail fell on Stewarts Ferry Pike near the northwest side of Percy Priest Lake.
Twitter tSpotter report indicated power lines were blown down on Madison Street in Clarksville.
Facebook video showed street flooding along First Street at Commerce Street in downtown Clarksville.
A fence was blown down and pea size hail was reported in the Blackman area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2020Every state in 2020This day in weather historyWarnings in Tennessee, August 2020
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: 917921, 917922, 917923, 917925, 917926, 917927.