A Bonafide Cold Front
Tuesday, September 15, 2026 · 6:08 AM
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Lyrics
Prolonged heat and humidity continues this week, warranting a Heat Advisory for most of Middle Tennessee through Wednesday evening. Rain chances remain low through Saturday and begin to increase Sunday and Monday. A gradual cooldown is on tap Sunday into early next week, but temperatures remain above-normal for the next several days. Gasping for air beneath the stagnation. The sky is a solid slab of glass. Five hundred ninety-five decameters of absolute doom! Zero zulu analysis reveals our tomb! A massive midlevel ridge centered over Middle Tennessee! Ninety-ninth percentile of five hundred millibar climatology! Mid-September is burning to the ground! High Resolution Ensemble Forecast gives thirty percent chance for one hundred degrees! The second latest hundred-degree day on record! The Tennessee River Valley boils in silence! The light decays under unrelenting height! An endless ridge choking out the sky! We pray in vain for a bonafide cold front! We pray in vain for a bonafide cold front! Borderline advisory through Thursday afternoon! No relief aloft, no rain on the horizon! The plateau holds the only low-end probability of precipitation! The rest of us are left to rot in upper nineties heat! The atmosphere refuses to collapse! The upper-level pattern will not flatten! Suffocated by the ridge! We burn until Monday! We burn!
The forecast discussion
KEY MESSAGES
Updated at 607 AM CDT Tue Sep 15 2026
- Prolonged heat and humidity continues this week, warranting a Heat Advisory for most of Middle TN through Wednesday evening.
- Rain chances remain low through Saturday and begin to increase Sunday and Monday.
- A gradual cooldown is on tap Sunday into early next week, but temperatures remain above-normal for the next several days.
SHORT TERM
(Tonight through Wednesday Night) Issued at 956 PM CDT Mon Sep 14 2026
This evening's 00Z analysis placed a 595 dam midlevel ridge centered over Middle TN. For mid September, this is about the 99th percentile of 500 mb height climatology.
This extremely late season ridging will manifest in heat impacts for much of the Tennessee River Valley this week.
High temperatures on Tuesday are forecast to be in the upper 90s.
HREF probabilities are hinting at a low chance (30%) of Nashville hitting 100 degrees Tuesday, which would be the second latest 100 degree day at BNA on record.
This heat also comes with an uncomfortable tinge of humidity, warranting a Heat Advisory for the majority of the area through Wednesday evening.
A potential extension of the Advisory through Thursday was discussed on shift, but things are looking much more borderline on Thursday so did not opt for an extension just yet.
LONG TERM
(Thursday through next Tuesday) Issued at 956 PM CDT Mon Sep 14 2026
We'll be stuck in this hot and dry pattern through at least the end of the week.
Low-end PoPs remain confined to the Plateau, leaving the rest of Middle TN with upper 90s temperatures and no rain to provide any relief.
The upper level pattern finally begins to flatten out a bit as we move into the weekend.
In the absence of such prominent ridging aloft, temperatures naturally trend back toward normal, finally dropping back below 90 degrees after the passage of a bonafide cold front on Monday.
Tuesday continues on the wetter and cooler trend, finally ushering in the first taste of fall.