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This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

KEY MESSAGES

Updated at 203 PM EDT Tue Sep 15 2026

- Hot temperatures to continue. Take precautions when outdoors to prevent heat illnesses.

- Most areas will remain dry this week, but the mountains will have low chances of showers.

DISCUSSION

Issued at 203 PM EDT Tue Sep 15 2026

Another hot July, err I mean September day on tap today, with poor Chattanooga notching yet another 90F day, meaning the record streak of consecutive 90F days for the city continues. Relief from the heatwave doesn't appear likely until next week. A very anomalous ridge will remain parked over the Mid-South for the next couple of days, bringing significant late season heat to the Tennessee Valley. While technically we're forecast to remain below heat advisory criteria, heat of this level can still bring dangerous effects to those who are either already vulnerable (whether age or medical reasons) or those who have extended times outdoors. Drink plenty of water!

Upper ridge is forecast to retrograde into the lower Mississippi Valley into the weekend as a weakening upper low pushes towards Florida. Both features will eventually wash out as next week begins. With the dissipation of the more significant ridging, we will induce a slight cooling trend towards more manageable heat for next week. The retrograde of the high will also likely allow for the daily diurnal summer storm pulse to become reinvigorated as suppression weakens. As such, look for isolated to widely scattered rain and storm chances to return in the PM hours as we head into the weekend and especially next week.

AVIATION

(18Z TAFS) Issued at 203 PM EDT Tue Sep 15 2026

VFR and dry conditions to continue. A low risk for patchy fog overnight at KTRI, but not enough confidence yet to include a direct mention in the TAFs. Any fog would be between the main hours of 09z to 13z.

PRELIMINARY POINT TEMPS/POPS

Chattanooga Airport, TN 72 97 71 97 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 70 94 70 95 / 0 0 0 10 Oak Ridge, TN 70 93 69 94 / 0 0 0 10 Tri Cities Airport, TN 63 90 65 90 / 0 10 0 30

MRX WATCHES/WARNINGS/ADVISORIES

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

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