textproduct: Huntsville

KEY MESSAGES

Updated at 813 PM CDT Tue Sep 1 2026

- A Heat Advisory has been issued 11 AM Wednesday through 8 PM Saturday due to Major to Extreme HeatRisk along with afternoon heat indices rising up to 105-109 degrees.

NEAR TERM

(Rest of tonight and Wednesday) Issued at 813 PM CDT Tue Sep 1 2026

Tranquil weather in every sense of the word this evening as afternoon cloud cover quickly diminished with the setting sun underneath a dome of high pressure. The end result will be a clear and calm night, as temperatures drop back into the lower 70s by early Wednesday morning. Unfortunately, heat impacts will begin to crank up considerably tomorrow and persist through the remainder of the week as the center of the ridge remains over the Tennessee Valley. The combination of daytime highs in the mid to upper 90s and dewpoints in the 70s will push heat index values into the 105-109 degree range by the afternoon hours. NWS HeatRisk highlights much of the area for Major (Level 3/4) impacts and subsequently a Heat Advisory will be in effect for the entire area beginning at 11 AM Wednesday.

SHORT TERM

(Wednesday night through Friday) Issued at 813 PM CDT Tue Sep 1 2026

The aforementioned Heat Advisory will remain in effect through 8 PM Saturday as Major (Level 3/4) to Extreme (Level 4/4) heat impacts will continue late this week. This will include the overnight hours as limited recoveries will occur with lows only dropping to the mid to upper 70s. With the ridge of high pressure and heat dome directly over the area, daytime highs will climb into the 95 to 100 degree range in most locations each day. Combined with dewpoints in the 70s, this will continue to create heat index values between 105 to 109 degrees both days. Strong subsidence from the ridge will significantly limited cloud cover and any potential for convection (with PoPs around 5% or less both Thursday and Friday). If you have outdoor plans this week, be sure to remain hydrated and seek shade when outdoors to avoid heat illness.

LONG TERM

(Friday night through Tuesday) Issued at 813 PM CDT Tue Sep 1 2026

The upper level ridge over much of the central and southeastern US will persist into this weekend; however, it looks like an upper trough tries to dig south over the Northeast, potentially breaking down the ridge over the Appalachians, Ohio Valley, and Tennessee Valley somewhat during this time. This may be short-lived, since synoptic guidance suggests that the ridge will build back over the Southeast through early next week. At the surface, high pressure over the Appalachians may be overtaken by a backdoor cold front slated to move into the region from the northeast by Sunday. Some guidance hints that this feature may bring enough moisture and lift with it to produce at least a low chance of showers and storms this weekend, but these trends will be monitored. By early next week, surface high pressure builds back over the Appalachians as the upper ridge takes hold over the region once again.

Overall, the hot and humid conditions are expected to continue through the long term period. Expect highs in the mid to upper 90s through the weekend with not much relief at night as lows merely dip into the upper 60s to lower 70s. These temperatures, along with dew points in the lower to mid 70s, will result in heat indices in the 100-106 degree range along with WBGTs in the mid to upper 80s (some spots around 90 degrees) and Moderate to Major HeatRisk (levels 2 and 3 of 4) for most of north Alabama and southern middle Tennessee. By early next week, the aforementioned backdoor front may temper the heat and humidity slightly. Highs in the lower to mid 90s with dew points in the upper 60s to lower 70s are anticipated, keeping the HeatRisk in the Moderate Risk category, heat indices generally between 98-103 degrees, and WBGTs solidly in the 83-87 degree range. Ultimately, the current Heat Advisory runs through Saturday evening; however, we will be monitoring if a further extension into Sunday becomes necessary.

Remember to practice heat safety, especially if you work outside or have outdoor activities! Stay hydrated, take plenty of breaks in the shade, and never leave people or pets in vehicles!

AVIATION

(00Z TAFS) Issued at 557 PM CDT Tue Sep 1 2026

VFR conditions will prevail through the period with light winds and a mostly clear sky.

HUN WATCHES/WARNINGS/ADVISORIES

AL...Heat Advisory from 11 AM Wednesday to 8 PM CDT Saturday for ALZ001>010-016.

TN...Heat Advisory from 11 AM Wednesday to 8 PM CDT Saturday for TNZ076-096-097.