textproduct: Huntsville

KEY MESSAGES

Updated at 951 PM CDT Tue Aug 4 2026

- Mainly afternoon/evening showers and storms will continue each day through Tuesday.

- NWS Heat Risk highlights Moderate (Level 2 of 4) heat impacts across the Tennessee Valley beginning Thursday. These values will increase to Major (Level 3 of 4) for parts of the area on Monday/Tuesday.

NEAR TERM

(Today) Issued at 338 AM CDT Wed Aug 5 2026

No major changes from the previous discussion. Patchy, dense fog has developed primarily in NE AL and southern middle TN in which visibilities intermittently drop to around 1/2 mile. Use caution on your morning commute in these areas, driving slow with low-beam headlights on. Any fog that develops should dissipate shortly after sunrise this morning.

Previous Discussion: Just a few showers linger on the radar at this hour and those are mainly west of I-65. To the east we have mostly clear skies, for now. The cloud shield associated with the showers and thunderstorms persisting in NW GA and Chattanooga area is encroaching the AL border. Depending on how this trend unfolds will depend on our fog potential for tonight. If is able to pass through or start to slide southerly with the midlevel flow, we could see patchy fog and locally dense fog late tonight into early tomorrow morning. Especially for those who received rainfall today. Lows will reach the upper 60s to lower 70s.

Tomorrow, the cut off low directly to our east will finally open up as a wave and most of it starts to lift into a broad trough. A sfc trough axis will move into the central portions of the TN Valley and will help spark up another round of showers and storms late tomorrow morning and afternoon. Highest chances (40-60%) will be east of I-65. Shear will be pretty weak but MLCAPE will be up to 2000 J/kg and PWATS will be just under 2". Heavy rainfall, lightning and gusty winds will be the primary threats and will note that steering flow is also pretty weak so cells will be moving slower. Daytime highs will reach the upper 80s to 90 degrees.

SHORT TERM

(Wednesday night through Friday night) Issued at 951 PM CDT Tue Aug 4 2026

On Thursday, a Bermuda high that remains off the mid Atlantic will build into the Southeast at the sfc while a mid level ridge across the Southwest and Southern Plains expands eastward. This will help increase our temps by a few degrees with highs in the upper 80s to lower 90s Thursday and Friday. Heat index values will make it feel more like it is in the upper 90s to just over 100 degrees. Low to medium chances of showers and storms (10-50%) are expected Thursday afternoon, with highest coverage east of I-65. Coverage will be lower on Friday. Lows both nights will reach the upper 60s to lower 70s.

LONG TERM

(Saturday through Tuesday) Issued at 951 PM CDT Tue Aug 4 2026

An upper level shortwave trough looks to sweep over the Mississippi River Valley and towards the Northeastern U.S. on Saturday. By Sunday and through early next week, upper ridging is shown to build over the southern Plains and Southeastern U.S. Meanwhile, surface high pressure is expected to remain parked over the Appalachians for much of this time. This feature does shift south over the northern Gulf coast by Tuesday, however. Overall, anticipating daily chances of showers and storms, mainly during the afternoon and evening hours. Expect higher chances of showers and storms on Saturday due to the aforementioned upper shortwave trough swinging over the region, with chances decreasing for Sunday through Tuesday. PWATs will remain elevated, but bulk shear will likely be 20 knots or less throughout the period. Therefore, severe weather is not anticipated, but frequent lightning and heavy rain will be the main threats with any storms.

As for temperatures, highs in the upper 80s to lower 90s with lows in the lower to mid 70s will be common. With elevated moisture persisting, afternoon heat index values are forecast to mostly range between 98-104 degrees through the weekend, then increase a bit by early next week as rain chances decrease. This results in a Moderate HeatRisk for north Alabama and Southern Middle Tennessee this weekend, with some locations in the Major category by Monday. This will be something to watch in case Heat Advisories become necessary for all or portions of the local area. Regardless, please remember heat safety! Drink plenty of water, take frequent breaks in the shade, and never leave people or pets in vehicles!

AVIATION

(06Z TAFS) Issued at 1141 PM CDT Tue Aug 4 2026

VFR conditions are forecast through the TAF period with the exception of PROB30 groups added at both sites during the afternoon to early evening hours to account for showers causing potential MVFR conditions. Otherwise, a low chance of fog exists overnight into Wednesday morning, however, confidence is low in this impacting the terminals.

HUN WATCHES/WARNINGS/ADVISORIES

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