textproduct: Louisville

KEY MESSAGES

* Frost Advisory and Freeze Warnings in effect until 9am EDT (8am CDT) this morning.

* Dry weather expected all of next week, with temperatures gradually climbing back into the 70s.

UPDATE

Issued at 929 AM EDT Sun Oct 18 2026

The Frost Advisory and Freeze Warning have both been allowed to expire as temperatures - which bottomed out in the 30s, coldest over the northern Bluegrass where there were a few sub-32 readings - are rapidly warming with the return of morning sunshine. The dry airmass should allow temperatures to quickly climb into the low 60s by lunchtime, with daily highs around 64-67 around 2-4pm EDT; this is about 3-5 degrees below normal for October 18th.

DISCUSSION

Issued at 252 AM EDT Sun Oct 18 2026

We have crystal clear sky cover this morning, and with sfc winds going calm, we are beginning to increase the effective radiational cooling this morning. Frost and freeze headlines continue as is for this morning, and plan for them to expire on time at 13z. For today, plenty of sunshine expected again, with winds mainly from the east as the center of the sfc high sits over the northeastern US. Even though we have a chilly start today, temps should be able to rebound into the mid 60s by this afternoon due to weaker CAA than yesterday.

The forecast remains dry and seasonal for the entire week ahead. The upper trough that passed through yesterday will begin to deepen into an upper closed low over the East Coast today, and will stall out over the western Atlantic for several days. The upper pattern jet streaks will remain across southern Canada in the days ahead, which means CONUS will lack any momentum to eradicate the stagnant upper low from the mid-Atlantic region. Upstream ridging will amplify over the next several days, with sfc high pressure sitting over a large portion of the country for the week.

The upper ridge amplifies even more by mid to late week as an PNW upper low shifts south over California, resulting in an Omega pattern to take shape from sea to shining sea. This keeps us dry through next weekend, with daily temps climbing back into the 70s. By next weekend, the amplified ridge axis should be over the Ohio Valley, with a 1030+ mb sfc high aiding in temps potentially reaching the upper 70s by then.

AVIATION /12Z TAFS THROUGH 18Z MONDAY/

Issued at 645 AM EDT Sun Oct 18 2026

There is some patchy river valley fog this morning, but chances for impacting any terminal remains low. SKC and VFR will continue today, with light winds from the east. Expect VFR for tonight too.

LMK WATCHES/WARNINGS/ADVISORIES

KY...None. IN...None.