textproduct: Huntsville

KEY MESSAGES

Updated at 931 PM CDT Thu Sep 3 2026

- A Heat Advisory remains in effect through 8 PM Saturday due to Major to Extreme HeatRisk, along with afternoon heat indices rising up to 105-109 degrees in portions of the forecast area.

- Very low chances (10-20%) for showers and thunderstorms will continue through the week. One or two strong may become strong Friday afternoon and Saturday afternoon.

NEAR TERM

(Today) Issued at 152 AM CDT Fri Sep 4 2026

Early morning temps currently range from the low to mid 70s under clear skies and calm winds. Will be watching for patchy fog formation this morning especially for locations that saw rainfall yesterday afternoon, but so far this morning there is no evidence of fog across the TN Valley. Dangerous heat will continue to be the focus today with afternoon heat indices forecast to exceed 105 degrees across a large portion of the TN Valley. No major changes were made to the forecast during the early morning update.

Previous discussion: Major (Level 3 of 4) to Extreme (Level 4/4) heat impacts will continue on Friday with a strong area of high pressure (and its subsequent heat dome underneath it) remaining directly over the Tennessee Valley. Ample sunshine and southerly flow will again warm highs into the 95 to 100 degree range in most locations by the afternoon. The combination of these hot temperatures and dewpoints in the 70s will once again lead to peak heat index values in the 105-110 range. A Heat Advisory remains in effect until 8 PM Saturday. Additionally, very low (10-20%) chances for showers and thunderstorms will exist during the afternoon hours. This activity will be tied to diurnal heating and dissipate after sunset. A vast majority of locations will remain dry.

SHORT TERM

(Friday night through Sunday) Issued at 931 PM CDT Thu Sep 3 2026

Similar heat impacts will continue on this weekend even as a weak shortwave/front approaches the region from the north. Highs again in the mid/upper 90s with heat index values between 105-110 will create Major (Level 3/4) to Extreme (Level 4/4) impacts and extreme caution is urged for those with outdoor plans. As alluded to, a weak shortwave will force a front south through the region late Saturday afternoon/evening. This feature will serve as a focus for a few showers and thunderstorms once again. Unfortunately this initial shortwave will do little to modify this air mass on Sunday as highs in the upper 90s and heat index values around 105 degrees will be common once again. The Heat Advisory may need to be extended through Sunday.

LONG TERM

(Sunday night through Thursday) Issued at 931 PM CDT Thu Sep 3 2026

The upper level ridge is forecast to slight shift to the west the begin the week, allowing relatively (key word here) cooler temperatures to settle over the TN Valley. High temperatures will still be in the low 90s with overnight lows in the mid 60s to low 70s as Moderate (level 2 of 4) heat impacts continue through the week. As the ridge shifts back eastward, temperatures will gradually climb back into the mid 90s by the end of the week with diurnal heating contributing to low chances (20% or less) of thunderstorm development each day. One thing to watch will be where sfc high pressure sets up along the Appalachians and whether or not NE AL and southern middle TN experience CAD (cold used loosely). If this is the case, increased PoPs may be necessary as differential heating boundaries begin to set up along North Central AL. As far as heat headlines go, will likely not need anything past Sunday as heat indices drop to around 100 degrees.

AVIATION

(12Z TAFS) Issued at 623 AM CDT Fri Sep 4 2026

VFR conditions are forecast through the end of the TAF period with few to sct cu this afternoon and light/var winds. There is a very low chance for showers and storms this afternoon but confidence was not high enough to include in TAFs at this time.

HUN WATCHES/WARNINGS/ADVISORIES

AL...Heat Advisory until 8 PM CDT Saturday for ALZ001>010-016.

TN...Heat Advisory until 8 PM CDT Saturday for TNZ076-096-097.