Major Heat Risk
Tuesday, September 15, 2026 · 12:42 PM
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Updated at twelve thirty-six P.M. Central Daylight Time Tuesday September fifteenth twenty twenty-six. Hot and humid conditions continue through the end of the week with triple digit heat indices. A Heat Advisory remains in effect for most of Middle Tennessee through Wednesday. Low rain chances mainly for the Plateau this weekend with higher rain chances returning early next week. A gradual cooldown is on tap Sunday into early next week, but temperatures remain above normal for the next several days. Stuttering guitars! Stalled clock! Eleven twenty A.M.! The atmosphere locked! Static! Pressure! Issued at eleven twenty A.M. Central Daylight Time— The high pressure— Dominates! Forecast high today—ninety-nine degrees at B.N.A.! Breaking nineteen twenty-seven— Ninety-eight degrees was the record! National Blend of Models gives— Fifty to sixty percent chance! One hundred degrees! Updated at twelve thirty-six P.M.! Subsidence! Zero rain! Upper-nineties! Triple digits! Cut short! Breaks off! Wednesday morning— Same story— Ten degrees above normal! Prolonged— High stays overhead through Friday! Flirting with records— The ridge shifts west by Saturday— Waiting for an upper-level troff to the north! Cold front pushing south— Early next week— Zero relief! Subsidence crushing the troposphere! No cap breaking! Sun burning through the grid! Crushed under the weight of the air! The ridge is anchored overhead! Ninety-nine degrees in the shadow of the dome! No rain, no shade, no room to breathe! We burn inside a major heat risk! Major heat risk! Below ninety degrees—early next week... If the troff comes... If the front survives... Eleven twenty A.M.
The forecast discussion
KEY MESSAGES
Updated at 1236 PM CDT Tue Sep 15 2026
- Hot and humid conditions continue through the end of the week with triple digit heat indices.
A Heat Advisory remains in effect for most of Middle Tennessee through Wednesday.
- Low rain chances mainly for the Plateau this weekend with higher rain chances returning early next week.
- A gradual cooldown is on tap Sunday into early next week, but temperatures remain above-normal for the next several days.
SHORT TERM
(Rest of today through Wednesday) Issued at 1120 AM CDT Tue Sep 15 2026
Heat impacts continue to be the main story through the end of the week as a very strong area of high pressure dominates the region.
High temperatures this afternoon are forecast to reach into the upper-90s to near 100 degrees.
For BNA, the forecast high temperature for today is 99 degrees which would break the daily record of 98 degrees set back in 1927. A 100-degree reading isn't out of the question either with latest NBM probabilities giving about a 50-60% chance of getting there.
Much of the same is expected on Wednesday with temperatures once again reaching into the upper- 90s with triple digit heat indices.
With strong subsidence, dry conditions will prevail with no rain expected
LONG TERM
(Wednesday Night through next Tuesday) Issued at 1120 AM CDT Tue Sep 15 2026
This hot and dry pattern is going nowhere through the end of the week as this high pressure stays overhead through Friday.
Temperatures will stay in the upper-90s through Friday with readings continuing to flirt with daily records.
An extension of the Heat Advisory may be needed through the end of the week.
While some spots may not technically hit heat advisory criteria, these forecast temperatures are at least 10 degrees above normal, and this prolonged heat wave will make for major heat risk.
The high finally shifts west this weekend, and temperatures will fall ever so slowly.
A pattern change looks to finally arrive early next week as an upper- level trough tracks to the north, sending a cold front south.
This will finally drop temperatures below 90 degrees and reintroduce medium rain chances to the forecast.