A weak frontal boundary was draped across Tennessee, triggering diurnal convection.
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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 weak frontal boundary was draped across Tennessee, triggering diurnal convection.
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 Aug 10, 6:29 PM EST, 1 hour 21 minutes earlier.
Area Forecast Discussion National Weather Service Morristown TN 729 PM EDT Fri Aug 10 2018 .AVIATION... Showers are quickly diminishing, but could still impact KTYS/KTRI for the first couple of hours. Fog will likely form once again tonight before burning off tomorrow. Conditions should return to VFR late tomorrow morning/early afternoon. && .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && ABM
Hazardous Weather Outlook National Weather Service Morristown TN 337 PM EDT Fri Aug 10 2018 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-111945- 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- 337 PM EDT Fri Aug 10 2018 /237 PM CDT Fri Aug 10 2018/ This Hazardous Weather Outlook is for portions of Southwest North Carolina...East Tennessee and Southwest Virginia. .DAY ONE...This Afternoon and Tonight Numerous showers can be expected across the area through late evening. There is a slight possibility for the development of a few thunderstorms; mainly early in the evening. The main threat with these showers will be moderate to occasionally heavy rain, which may lead to localized flooding. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
The Knoxville radar (KMRX), 94 km away, was scanning. The volume nearest the first event began at 00:48 UTC.
1 flash flood. Local standard time, as filed.
Roads flooded and vehicles have become stalled, requiring police assistance.
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, August 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: 782842.