A stationary back door front was draped over north Georgia and east Tennessee. Convection firing near the frontal boundary that afternoon and evening produced locally heavy rain near the state line of Tennessee and Georgia.
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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 MRX wrote it up.
A stationary back door front was draped over north Georgia and east Tennessee. Convection firing near the frontal boundary that afternoon and evening produced locally heavy rain near the state line of Tennessee and Georgia.
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 Morristown, TN wrote its last area forecast discussion before the first event at Sep 24, 2:06 PM EST, 1 hour 19 minutes earlier.
Area Forecast Discussion National Weather Service Morristown TN 306 PM EDT Mon Sep 24 2018 .SHORT TERM (Tonight and Tuesday)...We will remain in a rather wet and active weather pattern through the short term. Southerly flow across the region will continue to bring in abundant low level moisture and winds at 850MB will remain elevated. A broad frontal boundary will continue to meander over the region...adding weak lift. As a result...will routinely see occasional bands of showers and possible a few thunderstorms move through the area. With PWs staying near the 1.5 to 2 inch range...the main concern will continue to be heavy rainfall with the potential for isolated local flooding and some ponding in low lying areas. The area of most concern for heavy rain and flooding remains along the Cumberland Plateau where recent rainfall from the past couple of days combined with additional rains tonight and Tuesday may generate minor localized flooding. .LONG TERM (Tuesday night through Monday)...Models in decent agreement early on, but model agreement/consistency suffers late. A cold front will be approaching Tuesday night, and will move through on Wednesday before stalling just to our east/southeast. Expect showers and some thunderstorms to move in Tuesday night and continue through Wednesday, with showers lingering into Wednesday night especially east. With plenty of available moisture there continues to be a threat of at least localized flooding, so will include this threat in the HWO. A mid/upper level short wave trough will help to trigger additional showers and perhaps thunderstorms on Thursday, especially east. Friday through Monday look drier, although models do not agree on how much drying occurs as the upper ridge slowly builds back over the region and then slides east. Daytime highs will generally be near to above seasonal normals, and min temps will generally run above normal during the period. && .PRELIMINARY POINT TEMPS/POPS... Chattanooga Airport, TN 70 83 71 79 / 60 50 80 90 Knoxville McGhee Tyson Airport, TN 68 81 70 77 / 60 50 70 90 Oak Ridge, TN 68 81 70 78 / 70 50 70 90 Tri Cities Airport, TN 65 79 65 78 / 50 50 40 90 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && MJB/LW
Hazardous Weather Outlook National Weather Service Morristown TN 313 PM EDT Mon Sep 24 2018 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-251915- Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins- Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen- Northwest Cocke-Cocke Smoky Mountains-Northwest Greene- Southeast Greene-Washington TN-Unicoi-Northwest Carter- Southeast Carter-Roane-Loudon-Knox-Jefferson-NW Blount- Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains- Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe- Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee- Wise-Scott-Russell-Washington- 313 PM EDT Mon Sep 24 2018 /213 PM CDT Mon Sep 24 2018/ This Hazardous Weather Outlook is for portions of Southwest North Carolina...East Tennessee and Southwest Virginia. .DAY ONE...This Afternoon and Tonight Widespread showers and possibly a few thunderstorms will move through the Southern Appalachian Region into the overnight hours. Some of these storms could product brief heavy rainfall and cause localized flooding and ponding in some low lying areas. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Showers and a few thunderstorms can be expected Tuesday night into Wednesday night. Heavy rainfall can be expected across parts of the area, which may lead to localized flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated, but reports of severe weather or flooding are encouraged.
The Northeast Alabama radar (KHTX), 92 km away, was scanning. The volume nearest the first event began at 20:27 UTC.
2 flash flood. Local standard time, as filed.
Several flooded roadways over eastern Hamilton County toward the Bradley County line including town of Ooltewah.
Several roadways flooded across eastern portions of Hamilton County.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2018Every state in 2018This day in weather historyWarnings in Tennessee, September 2018
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: 787245, 787246.