textproduct: Morristown

KEY MESSAGES

Updated at 132 AM EDT Wed Sep 2 2026 - Very hot conditions are expected through the rest of the week with highs reaching well into the 90s and heat index values exceeding 100 for most places

- Temperatures gradually moderate some through the weekend with a return of at least isolated showers and storms.

DISCUSSION

Issued at 229 PM EDT Tue Sep 1 2026

Currently, a near 5,940m ridge is centered to our west with high pressure in place across the eastern U.S. The anomalous ridge and lingering moisture will continue the current heat wave. A slow eastward shift of the ridge Wednesday and Thursday will push temperatures even further into the 90s, potentially near 100 degrees for parts of the southern Valley. Heat index values will reach or exceed 100 for most places with 105 possible in some southern areas Wednesday or Thursday. Little relief from clouds or diurnal convection can be expected because of strong subsidence and limited coverage outside of the mountains. For reference, here are the record highs through the next 3 days.

Daily Record High Maximum Temperatures

Date Chattanooga Knoxville Tri-Cities Oak Ridge 09-02 100(2011) 98(2011) 96(1943) 99(1953) 09-03 100(1954) 98(2011) 96(2011) 99(2011) 09-04 102(1954) 101(1954) 99(1954) 100(1954)

By Friday, the pattern begins to shift slightly as an upper low tracks into the northeastern U.S., leading to suppression of the ridge and more northwesterly flow aloft. This will decrease temperatures and lead to a slight uptick in rain chances, potentially outside of the mountains. Moisture will increase by Saturday, along with a frontal boundary drifting down from the northeast, further increasing chances for showers and storms. The front will remain near or just to our east as troughing digs through Labor Day. This will keep a more eastward focus on isolated showers and storms, but most places will likely stay dry. Temperatures will be moderated lower in the 90s but still above normal.

AVIATION

(06Z TAFS) Issued at 132 AM EDT Wed Sep 2 2026

Given minimal change on the synoptic scale, have followed previous nights trends for TRI fog forecast. Otherwise, VFR conditions with light and variable winds will prevail through the period.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 98 76 99 75 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 96 74 98 74 / 0 0 10 0 Oak Ridge, TN 95 74 97 74 / 0 0 0 0 Tri Cities Airport, TN 93 70 95 71 / 0 0 0 0

MRX WATCHES/WARNINGS/ADVISORIES

NC...NONE. TN...Heat Advisory from 1 PM EDT /noon CDT/ this afternoon to 8 PM EDT /7 PM CDT/ this evening for Bledsoe-Bradley-Hamilton- Loudon-Marion-McMinn-Meigs-Northwest Monroe-Rhea-Roane- Sequatchie-West Polk.

VA...NONE.