textproduct: Morristown

KEY MESSAGES

Updated at 739 PM EDT Mon Aug 31 2026 - Hot and humid conditions will continue with highs well into the 90s and heat indices reaching or exceeding 100 for most by mid- week.

- Other than isolated storms in the mountains the next few days, rain chances do not return area-wide until late in the week into the weekend.

DISCUSSION

Issued at 301 PM EDT Mon Aug 31 2026

No major changes made to the forecast with a persistence type forecast looking to most likely work out as the overall weather pattern across the United States remains locked in place. This will lead to hot afternoons with some diurnally driven convection firing off across the Cumberland Plateau and southern Appalachian Mountains... Much like they're currently doing this afternoon.

It'll remain a copy/paste forecast with afternoon Heat Index's near or just above the triple digit mark for much of the eastern Tennessee Valley. The hottest temperatures of the 7-day forecast appear to be Wednesday and Thursday, when the ambient temperatures are highest, as well as an increase in humidity. It's possible a Heat Advisory could be introduced for a few counties later in the week, especially for portions of the mid and southern valley. Temperatures compared to climatology, will be running around 10 degrees above normal.

Heading into the weekend we'll finally have a chance at a pattern change as a stronger trough will try and suppress the ridge. At the surface, a low pressure center and cold front extending out from it will try to move in from the north. By the end of the first weekend of September, the ridge becomes centered near the Lee of the Rockies. Moisture from the Gulf also tries to move north the same time of the front edging south, which may become the next time the forecast area sees chances of widespread precipitation. Only the higher terrain will see differential heating induced showers or storm the next few afternoons. Temperatures will also trend cooler over the weekend and into next week, with much lower heights, northwest flow, and increasing precipitation chances. Humidity should also drop with this system as well.

AVIATION

(00Z TAFS) Issued at 739 PM EDT Mon Aug 31 2026

Persistence forecast underneath high pressure. Kept the TEMPO at KTRI for patchy fog, tomorrow's weather should be very similar to today. Light winds. VFR conditions outside of any brief morning fog.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 73 98 75 99 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 72 95 73 97 / 0 0 0 0 Oak Ridge, TN 72 95 73 97 / 0 0 0 0 Tri Cities Airport, TN 68 92 69 94 / 0 0 0 0

MRX WATCHES/WARNINGS/ADVISORIES

NC...NONE. TN...NONE. VA...NONE.