textproduct: Huntsville

KEY MESSAGES

Updated at 323 AM CDT Sat Aug 14 2026

- Dangerous heat will impact the Tennessee Valley through the middle of next week, with Major (Level 3/4) to Extreme (Level 4/4) heat impacts forecast.

- A Heat Advisory is in effect for all of northern Alabama and southern middle Tennessee through 7 PM Monday, with extensions potentially into the middle of next week.

- A Marginal (1 out of 5) risk for severe thunderstorms is forecast across Northern Alabama near and east of I-65 Monday afternoon.

NEAR TERM

(Today) Issued at 323 AM CDT Sat Aug 15 2026

Strong upper level ridging situated over the Deep South was a main feature controlling weather across the Tennessee Valley. This upper high featuring heights in the upper 590s decameters should remain across the southern Lower-48 into the first half of next week. Thus very warm to hot conditions will continue for the period. Adding to this is moisture, with area dewpoints mainly in the low/mid 70s forecast for much of the day. A gradient of dewpoints should setup during the day, with higher values to the east. Slightly drier values moving across our western areas will actually help temper heat indexes there. Thus with lesser cloud cover and more opportunity for daytime heating, high temperatures over NW Alabama should soar into the upper 90s per the NBM and the GFS LAMP. Older NAM/GFS MOS were hinting at 100/102 respectively for Muscle Shoals, that cannot be ruled out. The rest of the area should experience high temperatures in the mid/upper 90s.

With slightly higher moisture values to the east, strong daytime heating could result in an isolated shower or thunderstorm forming this afternoon. Staying with the NBM, only far NE ALabama are painted with lower end 15-20 percent convection chances this afternoon.

SHORT TERM

(Saturday night through Monday) Issued at 929 PM CDT Fri Aug 14 2026

The high pressure ridge will amplify and move eastward over the Mid South and lower Mississippi Valley Sunday into Monday, with a heat dome underneath this ridge subsequently shifting east into the region. Daytime highs in the 95 to 100 degree range will be common both days. With dewpoints in the mid to upper 70s, heat index values reach the 105-110 degree range, with some locations peaking between 110-114 degrees. As a result, NWS Heat Risk highlights a Major (Level 3/4) threat to Extreme (Level 4/4) threat for heat impacts both days. A Heat Advisory is in effect until 7 PM Monday, but we will need to monitor forecast trends across portions of northwest and north central Alabama and southern middle Tennessee where an upgrade to an Extreme Heat Warning may be needed in later forecast updates.

* Updated at 323 AM CDT Fri Aug 14 2026

A return of deeper moisture over our more eastern areas is forecast on Mon. This increase in moisture plus continued strong heating will result in a more unstable environment. This higher instability, along with the approach of a cold front will bring a lower end risk of thunderstorm development Mon afternoon. Forecast soundings indicate a potential of strong outflow wind gusts, aka microburst like in the strongest storms. Precipitable water amounts in the 1.8" to 2" will bring a risk of locally heavy downpours as well.

LONG TERM

(Monday night through Friday) Issued at 929 PM CDT Fri Aug 14 2026

The center of the ridge will begin to gradually flatten through the week, but Major (Level 3/4) heat impacts will continue through the work week. This is due to highs in the mid 90s and dewpoints in the mid to upper 70s creating heat index values in excess of 105 degrees each day. In addition to the heat, low chances (20-30%) of diurnally driven showers and thunderstorms will return to the forecast each afternoon Tuesday through Friday, thanks to the deep moisture in place. The one caveat would be if the ridge shifts a little further to the west, placing the area under northwest flow aloft. Should this play out, we may be more under the threat for MCS activity that rides along the edge of the ridge. We'll have to watch this in the days to come. Overall, hot and humid weather for the foreseeable future.

AVIATION

(06Z TAFS) Issued at 1111 PM CDT Fri Aug 14 2026

VFR conditions will prevail at each terminal through the remainder of the period, with light winds and a mostly clear sky.

HUN WATCHES/WARNINGS/ADVISORIES

AL...Heat Advisory until 7 PM CDT Monday for ALZ001>010-016.

TN...Heat Advisory until 7 PM CDT Monday for TNZ076-096-097.