A Fall Scorcher
Wednesday, September 9, 2026 · 12:23 AM
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Key messages updated at twelve twenty-three A.M. Central Daylight Time Wednesday September ninth twenty twenty-six. A Heat Advisory will be in effect for northwest Middle Tennessee Wednesday from eleven A.M. to eight P.M. for heat indices near one hundred five degrees. Above-normal temperatures continue with highs generally in the nineties through early next week. A wetter pattern kicks off Thursday through at least the weekend. Another quiet night across Middle Tennessee. The upper air flight launched at zero zulu. Five hundred ninety-seven decameters at five hundred millibar. The midlevel ridge is locked overhead. Nearing the ninety-ninth percentile of climatology. The atmosphere is trapped beneath a heavy dome. Major HeatRisk spreading along the Tennessee River basin. Southerly flow advecting warm, moist Gulf Coast air. Temperatures holding steady in the mid-nineties. No relief in sight before the cold front stalls out. The ridge flattens but the ground stays hot! Trapped in the moisture of the southerly slot! Sun beating down on the river corridor! It is a fall scorcher! Five hundred ninety-seven decameters! Ninety-ninth percentile! A fall scorcher! A fall scorcher! A fall scorcher! A fall scorcher!
The forecast discussion
KEY MESSAGES
Updated at 1223 AM CDT Wed Sep 9 2026
- A Heat Advisory will be in effect for northwest Middle TN Wednesday from 11 AM to 8 PM for heat indicies near 105 degrees.
- Above-normal temperatures continue with highs generally in the 90s through early next week.
- A wetter pattern kicks off Thursday through at least the weekend.
SHORT TERM
(Tonight through Thursday Night) Issued at 1004 PM CDT Tue Sep 8 2026
Another warm, quiet night is underway across Middle TN. This evening's 00Z upper air flight revealed a 597 dam height reading at 500 mb for KOHX.
For context, this is nearing the 99th percentile of climatology for early September.
This potent midlevel ridge will translate into yet another fall scorcher on Wednesday, warranting another Heat Advisory for the northwest portions of our CWA near the TN River on Wednesday.
This also coincides with the most widespread area of Major HeatRisk.
While the midlevel ridge flattens out a bit toward Thursday, things still stay pretty toasty at the surface.
With a surface high displaced just to our east, warm, moist Gulf Coast air will be advected in along southerly flow Thursday afternoon.
Temperatures stay well above normal in the mid 90s before our next chance of rain moves in Thursday night into Friday morning.
LONG TERM
(Friday through next Wednesday) Issued at 1004 PM CDT Tue Sep 8 2026
What barely qualifies as a cold front will approach Middle TN overnight Thursday into Friday morning, bringing a broad swath of showers and the occasional thunderstorm.
The main areas of higher PoPs (>60%) will be confined north of I-40 since this front is expected to promptly stall out Friday morning and slowly lift back north as a warm front over the weekend.
This pattern will keep PoPs above 50% each afternoon through the weekend, along with grossly above normal temperatures in the 90s.
Unfortunately, no clear relief is in sight.
LREF mean 500 mb heights place another highly amplified midlevel ridge over the southeastern CONUS again next week.