Strong Subsidence Prevails
Tuesday, September 15, 2026 · 6:58 PM
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Lyrics
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 early next week. A gradual cooldown is on tap Sunday into early next week, but temperatures remain above-normal for the next several days. Tremolo picking echoes in empty darkness while cold atmospheric noise suffocates the horizon. An immovable dome of high pressure seals our grave beneath a sky of white ash, where ninety-nine degrees eclipses the ancient ghost of nineteen twenty-seven. At B N A the mercury rises past the threshold of survival as the National Blend of Models gives a sixty percent chance of complete destruction, and strong subsidence smothers every vapor of hope before it can reach the light. The atmosphere locks down in an eternal furnace. No cloud can form in this dying air. The sky is a ceiling of iron and bronze. Strong subsidence prevails. We are trapped beneath ten thousand millibars of oppressive stillness, where forecast temperatures flirt with the edge of total extinction. The Heat Advisory extends its cruel hand over Middle Tennessee like a shroud that will not lift, and no rain will fall to cool the burning earth through the end of days. The ridge dominates the region. There is no shadow left to hide us. Nineteen twenty-seven was just a warning. Strong subsidence prevails. Strong subsidence prevails!
The forecast discussion
KEY MESSAGES
Updated at 654 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 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.