textproduct: Huntsville

KEY MESSAGES

Updated at 941 PM CDT Wed Jul 15 2026

- Low chances of showers and thunderstorms Thursday climb to medium chances Friday and Saturday. - Temperatures will remain slightly below normal through Thursday before gradually warming this weekend. - Heat Risk will reach the moderate category over the weekend. Heat index values are forecast to peak in the upper 90s to lower 100s.

NEAR TERM

(Tonight) Issued at 941 PM CDT Wed Jul 15 2026

Only a couple of remaining small showers remain these should dissipate overnight. We are expecting areas of low clouds and patchy fog to develop overnight within the very moist and light flow conditions. Overnight low temperatures will dip into the upper 60s to lower 70s.

SHORT TERM

(Thursday through Saturday night) Issued at 941 PM CDT Wed Jul 15 2026

The upper level low that has shifted west-northwest over the past couple of days has become an open wave trough axis over the Ozarks and will lift northwest into the central Plains today, then ingested into the northwesterly flow at the base of the upper trough in the eastern Great Lakes region. Meanwhile, multiple models show an MCV developing over GA resulting from ongoing convection along an exists shear axis. The models shows this MCV shift slowly west into western GA on Thursday afternoon with an inverted trough axis extending into the TN Valley. This pivots further west on Friday, increasing the chances of showers and thunderstorms. A wave also develops in the northeastern Gulf which may influence this trough axis to move further south and southwest Saturday. In either case, low to medium shower and thunderstorm chances exist Friday into Saturday, with highest chances across the eastern half of our forecast area. Temperatures will remain consistent, with highs in the upper 80s to around 90 and lows in the lower 70s.

LONG TERM

(Sunday through Wednesday) Issued at 941 PM CDT Wed Jul 15 2026

A deep upper low pressure system over eastern Canada this weekend will slowly weaken as we go into the new week. The presence of the low will in part induce mean troughing along the eastern seaboard from Sunday through the middle of next week. A broad area of surface low pressure should be situated over the southeast region over the weekend. This will create unsettled weather across the Tennessee Valley to start the new week. Moisture associated with an area of low pressure over the SE will bring scattered to numerous shower and thunderstorm chances on Sun. The higher rain chances will be more to the east, with lesser shower coverage to the west. With a mix of sun and clouds, seasonably warm or hot conditions are expected Sun, with highs from the upper 80s east to lower 90s west, and heat index values from the upper 90s to 104 degrees in a few spots.

The SE area of low pressure should weaken as we go into Mon, along with mean east coast troughing moving a bit more to the east. This will help return mainly drier conditions to the area for Mon-Wed. Under partly cloudy conditions, high temperatures for this period should range mostly in the lower 90s, with some mid 90s on Tue. Heat index values should range from the upper 90s to 104 for the Mon-Wed timeframe. The heat could become an issue on Tue, with an area around greater Huntsville rising into the 105-106 degree. This period is too far out to consider Heat Advisory this issuance, but something to keep in mind for next week. Rather warm low temperatures are expected in the period, in the low/mid 70s. A return of deeper moisture could bring low end chances of showers and thunderstorms Wed afternoon.

AVIATION

(00Z TAFS) Issued at 528 PM CDT Wed Jul 15 2026

Isolated -SHRA will dissipate by 01Z. VFR conditions are expected until late tonight when lower clouds and patchy FG are forecast to develop. There is a high chance of ceilings of 010-015agl (MVFR) at KMSL and KHSV from 11-16Z. Will reassess the FG potential this evening for the next update, but confidence remains higher on lower clouds than FG for the terminals. Ceilings will scatter and lift to VFR by 16Z. There is a low chance of -SHRA and TSRA again Thursday afternoon, but confidence remains too low to include in the TAFs at this time.

HUN WATCHES/WARNINGS/ADVISORIES

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