Destabilize The Night
Tuesday, August 18, 2026 · 10:44 PM
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Updated at ten forty-four P.M. Central Daylight Time Tuesday August eighteen twenty twenty-six. Wednesday will be very warm and more humid with temperatures rebounding into the mid nineties. Low to medium chances for showers and storms late Wednesday night and Thursday. There is a low severe weather threat Wednesday night along and west of Interstate sixty-five. Near normal temperatures this weekend. Rebounding! Rebounding! Mid nineties coming back! Clear skies over the mid-state, sixty degree start Decaying mesoscale convective system tearing us apart Rolling from the northwest, state line line-up Southerly flow in the atmosphere, filling up the cup Upper eighties, mid nineties, moist air primed Wednesday evening comes around, perfectly timed! Seven hundred millibar jet picking up the speed Destabilization is the only thing we need Clusters in the darkness, supercells in sight Cold front approaching, destabilize the night! Damaging winds in the midnight rain Heavy falls washing down the drain Along the highway, fighting to survive Cold front approaching, destabilize the night! Main hazard wind, storm mode set to cluster Tornado threat low but we feel the full muster Pushing to the east by Thursday mid-afternoon Mid eighties, low nineties, leaving us too soon Upper level troffing on Friday isolated rain Northwest flow aloft holding down the pain! JET! SEVEN HUNDRED MILLIBAR JET! DAMAGING WINDS WEST OF INTERSTATE SIXTY-FIVE! CLUSTERS FORMING! NO ESCAPE! DESTABILIZE! DESTABILIZE! Drier air coming through Thursday night. Near normal for the weekend. Near normal. Destabilize the night.
The forecast discussion
NEW SHORT TERM, LONG TERM
KEY MESSAGES
Updated at 1044 PM CDT Tue Aug 18 2026
- Wednesday will be very warm and more humid with temperatures rebounding into the mid 90s.
- Low to medium chances for showers and storms late Wednesday night and Thursday.
There is a low severe weather threat Wednesday night along and west of I-65.
- Near normal temperatures this weekend.
SHORT TERM
(Tonight through Thursday Night) Issued at 1044 PM CDT Tue Aug 18 2026
Clear skies currently over the mid-state, with lows in the 60s expected overnight and to start Wednesday morning.
Cloud cover will increase into Wednesday morning, as a decaying MCS makes its way towards the area.
Some guidance shows the MCS making it into our northwestern counties before falling apart, whereas others show it will stay north of the TN/KY state line.
If it does make it into TN, it will likely be confined to our NW counties.
Southerly flow will make things moist in the area, priming the atmosphere for the severe threat into Thursday morning.
Highs will be in the upper 80s to mid 90s.
Wednesday evening, a cold front will approach Middle Tennessee.
A 700 mb jet will pick up around this time as well, leading to destabilization and possibly some strong to severe storms.
Because of this jet, our main hazard is damaging winds, but heavy rainfall is also a threat.
Storm mode with this threat looks to be clusters of storms, but some supercells cannot be ruled out (our tornado threat is very low).
Thursday the front should move east by mid-afternoon, leaving us with drier air and high temperatures in the mid 80s to low 90s.
LONG TERM
(Friday through next Wednesday) Issued at 1044 PM CDT Tue Aug 18 2026
Troughing in the upper levels will lead to more shower chances on Friday, but we are not expecting any severe weather at this time.
These rain chances look to be fairly isolated, thankfully, and the pattern turns dry for the weekend.
Into the beginning of the work week, we remain in NW flow aloft, which looks to bring in isolated rain chances through mid-week.
Temperatures will remain in the upper 80s to low 90s through the forecast period.