textproduct: Huntsville

KEY MESSAGES

Updated at 926 PM CDT Wed Jun 24 2026

- Major (Level 3 of 4) to Extreme (Level 4 of 4) Heat Risk develops Sunday into Monday and continues through the middle of next week with Heat Index values of around 100 to 109 degrees each day.

NEAR TERM

(Today) Issued at 351 AM CDT Thu Jun 25 2026

Northwest flow in place over Mississippi continues to keep rain and some isolated thunderstorms southwest of NW Alabama. Despite calm winds in most areas of northern Alabama, some thicker cloud cover and some lift on the NE periphery of the disturbance moving SE through NW flow is likely keeping fog from forming. This will likely continue in portions of NW Alabama and towards Cullman county through 15Z.

So, there is some uncertainty concerning the coverage of fog development there. Further east, would expect more clearing around daybreak, calm winds, and less mixing of the atmosphere. This in theory should allow for more widespread fog development east of the I-65 corridor into southern middle Tennessee this morning. Cannot rule out at least some patchy dense fog development in those locations. Temperatures when you wake up this morning will likely be in the lower to mid 60s primarily.

Models continue to hint at low chances (15-30%) of showers or thunderstorms developing this afternoon. Mainly in NW Alabama and south of the Tennessee River. This activity will be produced by the northern edge of the forcing associated with the disturbance moving east later today through central Alabama. Shear is non- existent and SBCAPE will be limited overall. Thus, just expecting a few storms that could produce some lighting, but mainly just rain showers. A few showers could linger into the early evening hours in our southeastern counties. Highs should climb a bit higher today into the mid to upper 80s.

SHORT TERM

(Thursday night through Saturday) Issued at 926 PM CDT Wed Jun 24 2026

We will largely remain in zonal flow aloft on Friday, with a subtropical ridge noted across Texas building eastward across the Deep South. A couple of storm complexes may traverse the northern fringe of the ridge Friday and again Saturday (Mid-Mississippi, Ohio Valley, and central Appalachians). However, other than some cloud cover (and potentially some low precipitation chances in our far northern zones), the Tennessee Valley should remain devoid of showers/storms. The main concern will be the building heat that will begin to take shape late this week. Ample sunshine, light southerly winds, and a moist boundary layer will result in high temperatures reaching the lower 90s both days (with peak heat index values around 100 degrees). Those with outdoor plans should observe common sense heat safety practices.

LONG TERM

(Saturday night through Wednesday) Issued at 926 PM CDT Wed Jun 24 2026

The aforementioned ridge of high pressure will amplify and build north and east across the Tennessee and Ohio Valleys early next week. A very warm, humid air mass will spread eastward across the area underneath this ridge. This will create major to extreme heat impacts during this timeframe across much of the Deep South, including the entire Tennessee Valley region.

Each day (Sunday through Wednesday) will be characterized by mostly sunny to partly cloudy conditions, with high temperatures warming into the mid to upper 90s (with a few spots potentially reaching the 100 degree mark Tuesday/Wednesday). These hot temperatures, combined with dewpoints in the low to mid 70s, will create heat index values between 100-109 degrees each day. Heat Advisory products will likely be needed early next week, especially factoring the very limited recoveries overnight (lows in the mid to perhaps upper 70s).

NWS Heat Risk values highlight a vast majority of the region in Major Risk for Sunday and Monday. By Tuesday and Wednesday, NWS Heat Risk highlights an Extreme Risk across the entire region. These Major to Extreme Heat Risks, mean that this heat will affect everyone, especially those sensitive to heat and without adequate cooling/hydration. Health systems, industries, and infrastructure may also be impacted, especially by Tuesday and Wednesday as the heatwave builds with no relief occurring overnight.

If you have plans this weekend through much of next week, it is absolutely essential to practice heat safety such as staying hydrated and moving/remaining indoors in air conditioning during the peak heating of the day.

AVIATION

(12Z TAFS) Issued at 529 AM CDT Thu Jun 25 2026

VFR conditions are expected throughout the TAF period. Some CIGS around 5000 feet are currently impacting KMSL. This deck of clouds will linger and expand east into the KHSV terminal around 16Z. Between 18Z and 20Z, expect this cloud cover to become scattered at both terminals. Otherwise, light winds are expected throughout the TAF period.

CLIMATE

Issued at 926 PM CDT Wed Jun 24 2026

Moderate Risk for Much Above Normal Temperatures:

The Climate Prediction Center has included the Tennessee Valley in a Moderate Risk for Much Above Normal Temperatures for July 2-4. Therefore, there is a 40-60% chance for temperatures above above the mid 90s and Heat Index values above 105 degrees F during this period.

More information on the CPC U.S. Hazards Outlook can be found at: https://www.cpc.ncep.noaa.gov/products/predictions/threats/threats.php

HUN WATCHES/WARNINGS/ADVISORIES

AL...None. TN...None.