Three To Ten P.M
Sunday, August 16, 2026 · 9:30 PM
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Dangerous heat is expected through Monday with triple digit heat indices across most of Middle Tennessee. Medium storm chances Monday may bring a damaging wind risk during the afternoon and evening hours, especially to areas east of Interstate sixty-five. Extreme heat and humidity should be out of Middle Tennessee by late week. Peak heat passed but the misery clings Warm muggy night and the atmosphere stings Mid to upper seventies, southwest breeze No real relief, bringing us to our knees Monday morning resets, upper ridge bends Heat advisory running till seven P.M. Highs in the nineties on the pavement wall Heat index hundred five, watch the tower fall! Soundings showing high downdraft energy! Isolated cells with severe capacity! Weak front creeping from the north down here! Unstable air mass exploding with fear! Upper ridge flattens, the boundary drops down! Heat index climbing, one hundred and five! Damaging wind gusts tearing through town! The sky falls apart from three to ten P.M.! Marginal shear can't hold back the peak Collapse on the radar, the structure is weak East of Interstate sixty-five takes the hit Straight-line downburst where the storm cells split Tuesday brings the cooldown, upper airflow shifts Nineties with low humidity gifts! DOWNBURST! ELEVATED DOWNDRAFT POTENTIAL! DAMAGING GUSTS ARE INEVITABLE! THE FRONT PUSHES THROUGH! CRUSH EVERYTHING! Out by late week... Out by late week... Three to ten P.M....
The forecast discussion
NEW SHORT TERM, LONG TERM
KEY MESSAGES
Updated at 914 PM CDT Sun Aug 16 2026
- Dangerous heat is expected through Monday with triple digit heat indices across most of Middle Tennessee.
- Medium storm chances Monday may bring a damaging wind risk during the afternoon and evening hours, especially to areas east of I-65.
- Extreme heat and humidity should be out of Middle TN by late week.
SHORT TERM
(Tonight through Tuesday Night) Issued at 914 PM CDT Sun Aug 16 2026
The peak of the heat wave has passed, but residual effects linger.
Tonight remains warm and muggy under mostly clear skies with lows in the mid to upper 70s and light southwest winds.
Little relief from the heat.
Monday features another hot day as the upper ridge slowly flattens.
Highs are expected in the mid to upper 90s, with heat indices still climbing into the 100-105 range.
A Heat Advisory covers the entire area through 7 PM Monday.
A weak frontal boundary will approach from the N during the afternoon and evening, increasing showers and thunderstorm chances (highest chances E of I-65).
Forecast soundings continue to show strong instability and elevated DCAPE, supporting a risk of isolated strong to severe storms capable of damaging wind gusts, especially during the 3 to 10 PM window.
Deep-layer shear remains marginal, so organized severe weather is not expected, but any stronger cells will need to be monitored.
Overnight Monday lows fall into the low to mid 70s as the front pushes through.
Tuesday brings the first solid cooldown of the period.
NW flow and drier air will hold highs in the low to mid 90s with lower humidity and mostly sunny skies.
Overnight lows drop into the upper 60s to low 70s.
LONG TERM
(Wednesday through next Monday) Issued at 914 PM CDT Sun Aug 16 2026
Southerly return flow allows temperatures to rebound somewhat Wednesday into Thursday, with highs climbing back into the mid to upper 90s.
Heat indices may approach advisory levels in spots, but the extreme values of the past week are not expected to return.
Isolated afternoon storms remain possible but coverage looks limited.
By late week into the weekend, global models show increasing agreement on a broader trough amplifying over the easter U.S. This should finally dismantle the residual ridge influence, open the door for more widespread rain chances (especially Thursday into Sunday), and push temperatures closer to or slightly below seasonal normals.