textproduct: Morristown

KEY MESSAGES

Updated at 712 PM EDT Wed Jul 1 2026

- Isolated to scattered showers and thunderstorms this afternoon in the TN mountains and SW NC; some may be strong to severe.

- Very hot temperatures continue with afternoon heat index values around or above 100 degrees in most valley locations; Heat Advisory in effect through Friday.

DISCUSSION

Issued at 154 PM EDT Wed Jul 1 2026

Currently another very hot afternoon with Heat Index values already above the triple degree mark for much of the central and southern Tennessee Valley. This heat will help induce another round of afternoon showers and thunderstorms if they're able to break through a moderately strong cap set up under the ridge. If the storms are able to break through then we definitely have enough instability to see quickly building thunderstorms which will be capable of microbursts when they do collapse. We could also see some small hail, but the primary threat would be damaging straight line winds in a collapsing thunderstorm during the peak heating of the afternoon. Areas along the southern TN border and southward look to have the best chance at breaking the cap and initiating strong convection. Currently seeing a few trying to go up already as of this writing (2pm) which is a good indicator that somewhere in the region the cap is cap is going to break this afternoon.

Similar story tomorrow with another day of very hot temperatures and a very unstable atmosphere. Once again expect the primary threat to be south of Interstate 40, with damaging straight line winds and microbursts.

Heat Advisories will continue for today through Friday with triple digit heat index values expected each afternoon for most people outside the mountains.

Ridge looks to flatten out heading into next week, which will help alleviate the hottest temperatures, but we're still expected to sit above normal through the rest of the 7-day forecast.

AVIATION

(00Z TAFS) Issued at 712 PM EDT Wed Jul 1 2026

There is a chance of fog at TRI tonight, but singals from the models are not strong in this regard, so will have a couple hours of MVFR vis. Lower conditions are possible, however. Tomorrow afternoon, showers and storms are expected to develop near the TN/GA border area, which could affect CHA late in this TAF period.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 77 99 76 100 / 20 20 10 40 Knoxville McGhee Tyson Airport, TN 74 96 74 97 / 0 10 10 40 Oak Ridge, TN 74 97 75 98 / 0 10 10 30 Tri Cities Airport, TN 70 98 70 99 / 0 10 10 30

MRX WATCHES/WARNINGS/ADVISORIES

NC...Heat Advisory until 9 PM EDT Friday for Cherokee-Clay.

TN...Heat Advisory until 9 PM EDT /8 PM CDT/ Friday for Anderson- Bledsoe-Blount Smoky Mountains-Bradley-Campbell-Claiborne- Cocke Smoky Mountains-East Polk-Grainger-Hamblen-Hamilton- Hancock-Hawkins-Jefferson-Johnson-Knox-Loudon-Marion-McMinn- Meigs-Morgan-North Sevier-Northwest Blount-Northwest Carter- Northwest Cocke-Northwest Greene-Northwest Monroe-Rhea- Roane-Scott TN-Sequatchie-Sevier Smoky Mountains-Southeast Carter-Southeast Greene-Southeast Monroe-Sullivan-Unicoi- Union-Washington TN-West Polk.

VA...Heat Advisory until 9 PM EDT Friday for Lee-Russell-Scott VA- Washington VA-Wise.