textproduct: Huntsville

KEY MESSAGES

Updated at 751 PM CDT Fri Aug 21 2026

- There is a low to medium chance of patchy dense fog late tonight into early Saturday morning.

- There are low to medium chances of thunderstorms next week. However, timing and impact confidence remains low at this time.

NEAR TERM

(Tonight through Saturday Night) Issued at 751 PM CDT Fri Aug 21 2026

A cold front has shifted south of the TN valley in central MS, AL and GA. A secondary trough axis extends northeast a weak low in central AL through northwest GA and eastern TN where a couple of thunderstorms and showers had developed earlier. At this point, it appears like a dry overnight is expected with the loss of heating along this trough axis. Northerly flow has dropped dew points into the upper 60s to lower 70s this evening over northwest and north central AL into southern middle TN. PW values are dropping into the 1-1.25 inch range as well. Patchy fog is expected to develop as the boundary layer decouples and with a mostly clear sky. Overnight lows will dip into the middle to upper 60s. Another cold front was dropping south through the eastern Corn Belt into the lower MO valley. This front will drop into TN and AR Saturday afternoon and through north AL during the evening hours. MCS clusters are forecast tonight in the Plains which drop southeast into OK and AR in some fashion on Saturday. The NBM PoPs remain quite low, with slightly higher PoPs in our western counties (but still 20% or less). We will monitor trends with the new model runs later tonight, but expect only minor adjustments if any. Forecast highs on Saturday are in the lower 90s for valley areas, and upper 80s atop the higher plateau locations with dew points in the middle 60s which will feel much more comfortable. Any thunderstorm activity should either dissipate or shift south of the TN valley by late Saturday night.

SHORT TERM

(Sunday through Monday) Issued at 751 PM CDT Fri Aug 21 2026

Dry weather with seasonal temperatures are foreseen on Sunday with highs in the upper 80s to around 90 as high pressure builds south from the Upper Midwest into the OH and TN valleys. Overnight lows will be on the cool side with lower to middle 60s. NW flow at 5h will persist into Monday, with a low to mid level Theta-E gradient and convergence zone located across IA through MO and AR. This will be the genesis region of clusters of showers and thunderstorms which will likely be elevated/higher based as they reach our area on Monday, when we have low chances in the forecast.

LONG TERM

(Monday night through Friday) Issued at 751 PM CDT Fri Aug 21 2026

In the extended forecast, we will get a break from the extreme heat conditions, however in exchange for that, we will be stuck in an unsettled pattern.

We will start off with the pattern of an upper level low up in Quebec and the far NE U.S with an amplified ridge stretching from the southern Rockies up through the Northern Plains. On the back side of the ridge, a smaller upper-level low in Manitoba will try to be the driving force for a pattern change. As that smaller low slides SE into the Upper Great Lakes mid-week, the ridge will be dampened enough for it to round the ridge. This pattern will keep us in a northwesterly flow through the week. Embedded in this flow will be shortwaves that will swing through the TN Valley, keeping daily rain chances in. Right now it looks like there is a chance for an MCS to drop through on Tuesday, then again Wednesday night into Thursday morning. Will keep an eye on trends for specific hazards and timing, but for now will stick with NBM POPs. Daytime highs will be in the upper 80s to lower 90s with overnight lows around 70 degrees.

AVIATION

(00Z TAFS) Issued at 534 PM CDT Fri Aug 21 2026

Patchy fog is forecast to develop by 07-08Z, with a medium chance of MVFR conditions and low chance of IFR conditions due to lowered visibility. VFR conditions will return by 13Z for the balance of the period with a light north-northwest wind.

HUN WATCHES/WARNINGS/ADVISORIES

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