Scattered showers and thunderstorms developed during the morning hours on September 15th. There was one isolated flooding report in Perry 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 during the morning hours on September 15th. There was one isolated flooding report in Perry 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 Sep 15, 5:27 AM CST, 3 hours 8 minutes earlier.
Area Forecast Discussion National Weather Service Nashville TN 627 AM CDT Wed Sep 15 2021 .UPDATE... FOR 12Z AVIATION DISCUSSION. && .DISCUSSION... It's another muggy morning in the mid-state. Dew points hover around 70 degrees and if I didn't know any better, I'd say we've been transported back to July. However, summer isn't officially over and this mid-September morning could make for an interesting one. We've already seen a couple of showers poke up on radar over the last couple of hours and a few of the hi-res models are suggesting more development prior to daybreak. While forecast soundings aren't suggesting anything extreme, there are some signs that efficient warm air processes could be in play by mid-morning. PWs values are almost 2 standard deviations above normal for this time of year according to the 00Z OHX sounding and it's also showing pretty decent mid-level lapse rates (~7.0/deg C) already in place. What are we missing? Some kind of lifting mechanism. If you've been following for the last couple of days, you know that mechanism could be the frontal system due in here later this morning. Convection is already being seen along this front back in central MO/IL and as it nears Middle TN, it could provide that needed spark. Of more concern could be mean wind values less than 10 kts. This means slow moving storms. While this didn't look to be the case with the last few forecast packages, 1 to 2 inches rainfall totals with locally higher amounts of 3 to 4 inches could be possible later this morning. The problem is narrowing down a location where this could occur and that's difficult. I believe the focused rainfall could be anywhere west of the Cumberland Plateau and a Flash Flood Watch may become necessary for later this morning. Please be weather aware today. Any rainfall from today should end pretty quickly this evening as this front moves out of the mid-state. However, we won't be totally out of the woods as far as precipitation over the next several days. Moisture lingers in the region and while there doesn't look to be any real focusing mechanism, at least diurnal rain chances will be possible Thursday, Friday and Saturday -- but Sunday could be totally dry. Temperatures should hold pretty firmly at or below average for this time of the year throughout the next week. Today will probably be the exception with highs only in the low 80s and upper 70s due to the widespread rainfall. && .AVIATION... 12Z TAF DISCUSSION. A line of showers has developed from Lewis County to Nashville Metro to Macon County. These storms are slow moving and will affect BNA and MQY. VFR/MVFR CIGs expected. If a storm directly impacts a terminal brief IFR conditions will be possible. CKV...The same line of storms from above will flirt with this terminal. Will include VCSH through 20Z when there is a better chance for more dominate rain. VFR conditions expected...but MVFR can/t be ruled out for brief periods of time. CSV...Light fog will burn off by 13Z. The line of storms should be west of this site with VCSH/VCTS this afternoon and VFR conditions. Winds will be very light from the southwest today and then going calm overnight. MVFR to IFR is expected overnight due to fog. && .OHX WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch through this evening for Cheatham-Clay- Davidson-Dickson-Giles-Hickman-Houston-Humphreys-Jackson- Lawrence-Lewis-Macon-Marshall-Maury-Montgomery-Perry-Robertson- Rutherford-Smith-Stewart-Sumner-Trousdale-Wayne-Williamson- Wilson. && DISCUSSION......Unger AVIATION........12
Hazardous Weather Outlook National Weather Service Nashville TN 513 AM CDT Wed Sep 15 2021 TNZ005>011-023>034-056>066-075-077>080-093>095-161015- 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- 513 AM CDT Wed Sep 15 2021 This Hazardous Weather Outlook is for Middle Tennessee. .DAY ONE...Today and tonight. Heavy rain is expected through the morning and afternoon hours today. 1 to 2 inches will be common, but a quick 3 to 4 inches a few spots could lead to localized flash flooding. The main area of concern is anywhere west of the Cumberland Plateau, but especially along the KY/TN state line. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be necessary today. 27
The Ft Campbell radar (KHPX), 136 km away, was scanning. The volume nearest the first event began at 14:36 UTC.
1 flash flood. Local standard time, as filed.
Several roads were flooded in and around Linden including South Mill Street, Brush Creek Road, and several areas on Highway 13.
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, September 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: 985945.