textproduct: Huntsville

KEY MESSAGES

Updated at 901 PM CDT Sun Sep 13 2026

- NWS HeatRisk values will largely be in the Moderate category during the forecast period, although Major category is expected mainly for portions of NW Alabama and urban areas Monday through Wednesday.

- Heat Advisory in effect from 11 AM through 8 PM on Tuesday for portions of north Alabama and southern middle Tennessee.

NEAR TERM

(Rest of tonight and Monday) Issued at 901 PM CDT Sun Sep 13 2026

This evening we are monitoring what should soon be a decaying cluster of thunderstorms across NW TN that are slowly tracking southeast. These storms have been poorly modeled by hi-res guidances, but with the loss of diurnal heating and a weakly sheared environment we do expect these storms to decay before or shortly after reaching the TN/AL state line. There will be another low to medium chance for patchy dense fog again tonight, and conditions will need to be monitored in case a Dense Fog Advisory is needed. Overnight lows will continue to be on the warmer side of seasonal norms, falling to the lower 70s to upper 60s in the higher terrain.

Dry conditions will persist through Monday as upper ridging and subsidence build into the region and temperatures continue to rise. Although moisture/humidity is slightly more limited with this heat wave, afternoon highs in the mid to upper 90s with dewpoints in the lower 70s will bring heat indices to the 99-106 degree range. This will pose a danger for heat related illness especially for those that are especially sensitive to the heat or without proper cooling and hydration.

SHORT TERM

(Monday night through Wednesday night) Issued at 901 PM CDT Sun Sep 13 2026

Hot and dry conditions will continue through the short term period as the aforementioned ridge and high pressure aloft continues to build over the eastern CONUS. H85 rises along with a drier southeasterly fetch will keep sfc temps on the rise while also suppressing moisture advection from the Gulf. A Heat Advisory has been issued from 11 AM through 8 PM on Tuesday across portions of north central and northwest AL as well as portions of southern middle TN. Afternoon highs could approach 100 degrees across northwest AL with heat indices reaching 106 degrees. Similar conditions are forecast on Wednesday and an extension of the Heat Advisory may be needed if forecast trends increase temperatures further. With overnight lows in the 70s, compounding heat effects will lead to moderate to major HeatRisk categories, highlighting a danger to those working or spending time outdoors without adequate cooling and hydration. Please dress in lightweight, light colored clothing and drink plenty of fluids when participating in outdoor activities. Also remember to never leave people or pets unattended in vehicles!

LONG TERM

(Thursday through Sunday) Issued at 901 PM CDT Sun Sep 13 2026

The TN Valley won't find a break from the heat in the Long Term. The lingering ridge across the Southeast will start to retrograde as a cut off low pushes into FL starting on Thursday. With a sfc high anchored across the east coast, highs will remain in the 90s through the week. However, the low will pull additional moisture into the region, pushing Heat Index values around 100 degrees, but at this time below any advisory criteria. The low will slide westward across the northern Gulf through the weekend, and this will allow for a front in the Ozarks and OH Valley to dip southward towards the TN Valley. Models still disagree on if the front will make it in or not this weekend and the outcome will have an effect on our temps, cloud cover, and our precip chances. If it moves through, we could have a quick break in the heat but increased rain chances, but if it remains to our north, hot and humid conditions will persist. Will stick with guidance that has the 90s lingering, heat index values still hovering around 100 degrees and low precip chances (15-25% Sat, 20-30% Sunday). However, trends will be monitored for future needed adjustments.

AVIATION

(06Z TAFS) Issued at 1226 AM CDT Mon Sep 14 2026

VFR conditions will be the predominant flight category at each terminal through the period. The one exception may be early this morning, when localized MVFR fog may develop around daybreak. Have handled this with a TEMPO between 09-13z for now.

HUN WATCHES/WARNINGS/ADVISORIES

AL...Heat Advisory from 11 AM to 8 PM CDT Tuesday for ALZ001>007.

TN...Heat Advisory from 11 AM to 8 PM CDT Tuesday for TNZ076-096.