Scattered showers and thunderstorms developed in the afternoon hours on August 11th. There was one isolated hail report in Bedford County.
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.
Scattered showers and thunderstorms developed in the afternoon hours on August 11th. There was one isolated hail report in Bedford 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 Aug 11, 6:02 PM CST, 14 minutes earlier.
Area Forecast Discussion National Weather Service Nashville TN 702 PM CDT Wed Aug 11 2021 .UPDATE... FOR 00Z AVIATION DISCUSSION. && .DISCUSSION... Heat continues to be the highlight of the short term, with continued chances mainly for afternoon showers and thunderstorms through the forecast. 850 mb temps of 20C-22C allowing for highs in the mid 90s, and continued southwesterly flow at the surface keeping dewpoints in the low to mid 70s. Winds picked up a bit more this afternoon, and likely allowed for some additional low level mixing which helped lower dewpoints to the low 70s for most. This kept the heat index values around or just below 105. For Thursday, highs are expected to be a degree or two warmer for most areas, with little change to the dewpoints, so have the heat advisory continuing tomorrow as well. Upper high continues to linger off to our east, which will keep afternoon diurnal showers and storms in the forecast through Friday. On Friday, an upper trough in the Midwest will start working its way southward, with the cold front sneaking in as soon as early Saturday morning. Likely time to see more convective activity will be Saturday afternoon with diurnal forcing helping out, but model agreement isnt lining up just yet. As the trough continues east over the weekend, the front appears to stall over our north, and model agreement on more widespread showers and storms Sunday afternoon is a bit better. Remnants of the tropical storm with current model solutions doesnt completely move overhead of the mid state, but looks to clip our eastern zones early to mid-week depending on which solution you buy into. With the front still lingering over the region, and the tropical storm remnants moving off to our east and northeast, we should stay in an active pattern with best chances for showers and storms during the afternoon, but could persist into the overnight hours and in the morning. Right now, QPF amounts are below any flooding thresholds, but as model agreement increases there will be a better handle on any heavy rain potential next week. && .AVIATION... 00Z TAF DISCUSSION. VFR conditions expected at all sites, with the exception of patchy fog reducing visibilities early Thursday morning at CSV. Winds will be around 5 knots and out of the south and southwest. Vicinity storms possible at CSV Thursday afternoon. && .OHX WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 8 PM CDT this evening for Bedford-Cannon- Cheatham-Clay-Coffee-Davidson-De Kalb-Dickson-Giles-Hickman- Houston-Humphreys-Jackson-Lawrence-Lewis-Macon-Marshall-Maury- Montgomery-Perry-Putnam-Robertson-Rutherford-Smith-Stewart- Sumner-Trousdale-Wayne-Williamson-Wilson. Heat Advisory from 11 AM to 8 PM CDT Thursday for Bedford-Cannon- Cheatham-Clay-Coffee-Davidson-De Kalb-Dickson-Giles-Hickman- Houston-Humphreys-Jackson-Lawrence-Lewis-Macon-Marshall-Maury- Montgomery-Perry-Putnam-Robertson-Rutherford-Smith-Stewart- Sumner-Trousdale-Wayne-Williamson-Wilson. && DISCUSSION......Barnwell AVIATION........11
Hazardous Weather Outlook National Weather Service Nashville TN 517 AM CDT Wed Aug 11 2021 TNZ005>011-023>034-056>066-075-077>080-093>095-121030- 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- 517 AM CDT Wed Aug 11 2021 This Hazardous Weather Outlook is for Middle Tennessee. .DAY ONE...Today and tonight. Heat Index values of 105 to 110 degrees are likely across most of Middle TN today. Please take the necessary precautions to protect yourself and loved ones from heat related illnesses. Very isolated thunderstorms are possible on the Cumberland Plateau this afternoon. Wind gusts of 40 mph and heavy rainfall are the main concerns. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Heat Index values of 105 to 110 degrees are likely Thursday and possibly even Friday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. 27
Special Weather Statement
National Weather Service Nashville TN
538 PM CDT Wed Aug 11 2021
TNZ078-112315-
Warren TN-
538 PM CDT Wed Aug 11 2021
...A strong thunderstorm will impact portions of central Warren
County through 615 PM CDT...
At 538 PM CDT, Doppler radar was tracking a strong thunderstorm near
McMinnville. This storm was nearly stationary.
HAZARD...Winds in excess of 30 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
McMinnville and Morrison.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3554 8580 3565 8591 3577 8567 3561 8562
TIME...MOT...LOC 2238Z 249DEG 4KT 3562 8581
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
WhiteheadSpecial Weather Statement
National Weather Service Nashville TN
640 PM CDT Wed Aug 11 2021
TNZ077>079-120015-
Coffee TN-Grundy TN-Warren TN-
640 PM CDT Wed Aug 11 2021
...A strong thunderstorm will impact portions of southwestern Warren,
east central Coffee and northwestern Grundy Counties through 715 PM
CDT...
At 639 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles east of Manchester. This storm was nearly stationary.
HAZARD...Winds in excess of 30 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Morrison and Viola.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3540 8591 3547 8600 3563 8594 3552 8568
TIME...MOT...LOC 2339Z 217DEG 4KT 3549 8589
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
WhiteheadThe Nashville radar (KOHX), 71 km away, was scanning. The volume nearest the first event began at 00:16 UTC.
1 hail. Local standard time, as filed.
A tSpotter Twitter report indicated quarter size hail fell in Bell Buckle off of Liberty Pike and Beechwood Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2021Every state in 2021This day in weather historyWarnings in Tennessee, August 2021
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: 978803.