Scattered slow-moving showers and thunderstorms developed across Middle Tennessee during the afternoon and evening on August 11. Some reports of flash flooding were received across parts Marshall and Giles Counties.
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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 slow-moving showers and thunderstorms developed across Middle Tennessee during the afternoon and evening on August 11. Some reports of flash flooding were received across parts Marshall and Giles Counties.
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, 1:23 PM CST, 1 hour 37 minutes earlier.
Area Forecast Discussion National Weather Service Nashville TN 223 PM CDT Fri Aug 11 2017 .DISCUSSION... While some sun was being seen across our northern counties this morning, cloud cover has been the name of the game. Those clouds are finally bearing some showers at forecast time. Expectations are for scattered thunderstorms to develop for the late afternoon and evening hours -- a few of which might even provide a strong wind gust or two. As we've been advertising, wind shear is at a premium, but there just might be enough for a couple of cells to organize long enough for that wind. In the very near term, high PW values and training storms could create a localized flooding concern this afternoon, as well, so we will need to monitor this potential along with the small wind gust potential. Will update the HWO to reflect this. On the whole, I'm very dissatisfied with the guidance we've been provided with for this forecast. Models are very much all over the place and the flip-flopping of the last few days continues with this afternoon's suite of models. Saturday still looks dry for most, but a lingering shower or thunderstorm behind this evening's frontal passage isn't out of the question during the morning hours, especially on the Plateau. Will maintain the 30 PoP in the forecast from last night's package. One big change from past forecasts is guidance for Sunday and Monday. What looked to be a fairly wet forecast now looks quite dry until Tuesday. All good news for the weekend and those who want to make outdoor plans, but doesn't bode well for the forecasting community. The rest of the next week also falls squarely into the low confidence category. There has been some consistency regarding weak ridging for the middle of next week -- maybe Tuesday and Wednesday -- however, the GFS continues to carry decent QPF, even through the ridging. For this reason, I'll show only a chance PoP and we'll have to hope for a little more continuity going forward. If there's any bright side to the today's forecast package is that without any strong, typical summer-time ridging, temperatures should remain at or below normals for this time of the year. && .AVIATION... 18Z TAF DISCUSSION. As convective temps are reached and surpassed, look for convective activity to increase today. Coverage will be sufficiently adequate enough to warrant a tempo group at csv for this evening. Will utilize vcts elsewhere. Otw, look for a cold front to reach the area late tonight. Convection should end aft 06z, but low clouds and some fog will be possible late tonight. && .PRELIMINARY POINT TEMPS/POPS... Nashville 72 86 67 86 70 / 40 20 10 10 20 Clarksville 67 84 63 83 66 / 40 20 10 10 20 Crossville 68 79 63 81 66 / 40 30 10 10 20 Columbia 71 85 66 86 69 / 40 30 10 10 20 Lawrenceburg 71 85 66 85 69 / 50 30 10 20 20 Waverly 69 84 65 83 67 / 40 20 10 10 30 && .OHX WATCHES/WARNINGS/ADVISORIES... NONE. && DISCUSSION......Unger AVIATION........21
Hazardous Weather Outlook National Weather Service Nashville TN 202 PM CDT Fri Aug 11 2017 TNZ005>011-023>034-056>066-075-077>080-093>095-121915- 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- 202 PM CDT Fri Aug 11 2017 This Hazardous Weather Outlook is for portions of Middle Tennessee. .DAY ONE...This Afternoon and Tonight. A few thunderstorms could become strong this afternoon and evening for areas generally along and south of Interstate 40. The main concerns will be strong wind gusts and locally heavy rainfall. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time. 27
The Northeast Alabama radar (KHTX), 89 km away, was scanning. The volume nearest the first event began at 20:57 UTC.
2 flash flood. Local standard time, as filed.
Several roads were flooded and closed in Lewisburg with water rescues of people from vehicles conducted on Old Columbia Road at Silver Creek Road, Hopkins Avenue, and Franklin Avenue at Silver Creek.
Several roads were flooded and closed in and south of Pulaski including Braly Lane at Bennett Drive, as well as Garner Hollow Road where a water rescue was conducted.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2017Every state in 2017This day in weather historyWarnings in Tennessee, August 2017
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: 719795, 719796.