textproduct: Huntsville

KEY MESSAGES

Updated at 1040 AM CDT Thu May 7 2026

- Expect fog to develop overnight. Some patchy dense fog could occur in shelter valley locations of NE Alabama.

- Low to medium chances for showers and a few thunderstorms return this weekend.

NEAR TERM

(Rest of tonight and Friday) Issued at 1040 PM CDT Thu May 7 2026

High cloudiness will move east across the region and should continue much of the night and into early Friday morning. This cloud cover may push southeast of the area just before and after daybreak. The cloud cover is very high and thin well above 15,000 feet. Light to calm winds are in place in most areas.

Overall good radiational cooling setup in place except for the high clouds. Due to thin nature of clouds, not sure they will have much affect on keeping temperatures from falling quickly tonight. The bigger question will be if drier air can seep south from light northerly flow in the boundary layer to around 925 mb overnight.

Based on trends so far this evening, dewpoints are only increasing over the past few hours. However, most guidance does bring drier air into the region between 2 AM and 5 AM.

The end result looks like it will be fairly widespread fog development in areas where dewpoint depressions are already 3 degrees or less. This is mainly south of the Tennessee River and in northeastern Alabama as well as Franklin County (TN) and Moore County (TN). This will probably erode some with time towards daybreak as drier air moves into the region. We will have to watch for dense fog development, especially over the next few hours towards midnight through about 3 or 4 AM.

Based on dewpoints in upstream observations to the north, we could drop into the lower to mid 40s towards daybreak in southern middle Tennessee and the cooler valley locations in NW Alabama. Keeping lows higher south of the TN/AL border in general though, only dropping them into the 45 to 50 degree range.

Expect clearing to occur in northwestern Alabama just before and around daybreak on Friday. This clearing should push southeast and through the area during the late morning into the early afternoon hours. This insolation should push highs into the lower to mid 70s. During the late afternoon into the evening hours on Friday, expect mid/high cloud cover to push back into the area from the southwest.

SHORT TERM

(Friday night through Sunday) Issued at 1040 PM CDT Thu May 7 2026

Towards midnight Friday night, a longwave trough axis moves quickly east into the Ohio Valley region. Advection ahead of this feature could help to enhance low level moisture advection enough to aid isentropic lift near and north of the stalled front over Louisiana and southern Alabama. This could produce some isolated to scattered shower activity over the area after midnight on Friday night into the morning hours on Saturday.

Model guidance really diverges on how far north the surface front to our south moves though Saturday afternoon into Saturday evening. For now kept the forecast on the drier side with the slower movement of the front northward. That being said can't rule out isolated to scattered showers or thunderstorms by Saturday afternoon especially. Shear is very minimal, but may approach 30-35 knots (but models are not in sync on that). If that happens a few strong storms may be in the cards Saturday afternoon evening.

We may see the front push southeast Saturday night through the area, but again models are not in total agreement. If it does, dry weather and a nice day will be in store on Sunday. A few models do hint at some rain and thunderstorms pushing northeast though ahead of another approaching trough axis. Either way, with WSW flow in place we should warm up into the upper 70s to lower 80s again over the weekend.

LONG TERM

(Sunday night through Thursday) Issued at 1040 PM CDT Thu May 7 2026

Guidance is more convergent on a more amplified longwave trough axis and parent low moving from the Ohio Valley east through the area Sunday night into Monday. This could bring additional showers and thunderstorm activity to the area during that period, before much cooler air pushes back into the region.

AVIATION

(00Z TAFS) Issued at 636 PM CDT Thu May 7 2026

VFR weather should continue over and around the greater TN Valley for aviation interests. Surface high pressure currently over the Mid South and Mid MS Valley will build eastward, being positioned off of the east coast by Fri morning. NW winds 5-10kt early, should become light and variable for the overnight, then become southerly in the late morning and early afternoon at 5-10kt.

HUN WATCHES/WARNINGS/ADVISORIES

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