textproduct: Huntsville

KEY MESSAGES

Updated at 936 PM CDT Tue Jun 23 2026

- Medium chances of dense fog are forecast tonight into early Wednesday morning

- Low chances (30% or less) of showers and thunderstorms Thursday into Friday

- Major (Level 3 of 4) Heat Risk develops Sunday into Monday and continues through mid next week with Heat Index values of around 100 to 105 degrees

NEAR TERM

(Today) Issued at 357 AM CDT Wed Jun 24 2026

High thin cloud cover is pushing east across north central Alabama from the northwest. Some dense fog has already developed over the valley areas of Jackson county, AL. Calm winds are in place across the area. Thin high clouds will encompass all of northern Alabama and southern middle Tennessee over the next few hours. However, they are so thin and high that they will have little effect on radiational cooling. With most areas already seeing dewpoint depressions at 0 degrees, thinking widespread dense fog could develop through early Wednesday morning. It is most certain though in northeastern Alabama and portions of southern middle Tennessee, where it is already forming and showing up well in satellite imagery.

A Dense Fog Advisory may need to be issued shortly over the next hour or so for Jackson (AL) and Franklin (TN) county. However, it may need to encompass areas further west as time goes on. Temperatures will likely not change much through 7 AM, but may drop another 1 to 3 degrees. When you wake up, temperatures should mainly be in the upper 50s to around 62 degrees. Fog will likely be slow to burn off where it is dense, likely hanging around until at least 9 AM in those areas. It should be a bit warmer today with highs climbing into the 81 to 86 degree range, but still nice for this time of year. Expect high clouds to linger much of the morning hours, before thinning out some in the afternoon. A few showers could graze far southwestern Franklin county in the afternoon.

SHORT TERM

(Wednesday night through Friday) Issued at 936 PM CDT Tue Jun 23 2026

A gradual warm up is forecast through the short term as a strong upper level ridge begins building into the area from the west, with highs rising into the upper 80s to lower 90s by Friday along with heat indices in the upper 90s to near 100 degrees. However, an upper level shortwave is forecast to sneak in Thursday morning, causing low chances (30% or less) of thunderstorms Thursday afternoon into the evening hours (aided by moisture from southerly flow). No strong nor severe storms are currently anticipated with this activity as shear is very low with minor instability to work with.

LONG TERM

(Friday night through Tuesday) Issued at 936 PM CDT Tue Jun 23 2026

A fairly stout upper-level ridge of high pressure over Texas will build into the region this weekend into early next week. A very warm, humid air mass will spread eastward over the Tennessee Valley underneath this ridge and the end result will likely be major to potentially extreme heat impacts during this timeframe. Ample sunshine each day will push high temperatures into the low to mid 90s Saturday and Sunday and the mid to potentially upper 90s Monday and Tuesday. These hot temperatures, combined with dewpoints in the low to mid 70s will create heat index values over 100 degrees each day, and potentially above 105 degrees Sunday, Monday, and Tuesday. Should these trends continue, Heat Advisory products may be needed early next week -- especially factoring the very limited recoveries overnight (lows in the mid 70s). NWS Heat Risk values highlight a vast majority of the region in Major Risk for this timeframe, meaning that this heat will likely affect anyone sensitive to heat (especially those without adequate cooling/hydration) as well as some health systems and industries. If you have outdoor plans this weekend into early next week, be sure to practice heat safety such as staying hydrated and seeking shade when outdoors to avoid heat related illness.

AVIATION

(06Z TAFS) Issued at 1221 AM CDT Wed Jun 24 2026

Thin high cloud cover will move over both terminals through the overnight hours. Light winds are in place and dewpoints are already withing 1 degree or less of the temperatures. Good radiational cooling conditions will be little impacted by the expected cloud cover. Weak advection of lower dewpoints from the NE may help to hinder dense fog more so east of the I-65 corridor. Despite this, expect VFR conditions give way to MVFR VSBYS due to fog development after 8Z. With less modification via lower dewpoints expected at KMSL, included a tempo group for KMSL bottoming out VSBYS between 8Z and 12Z at 1/2SM. May have to amend at KHSV later to do the same, but confidence there is not as high. After 14Z, expect VFR conditions to return with light and variable winds expected.

CLIMATE

Issued at 936 PM CDT Tue Jun 23 2026

Moderate Risk for Much Above Normal Temperatures:

The Climate Prediction Center has included the Tennessee Valley in a Moderate Risk for Much Above Normal Temperatures for July 1-3. Therefore, there is a 40-60% chance for temperatures above above the mid 90s and Heat Index values above 105 degrees F during this period.

More information on the CPC U.S. Hazards Outlook can be found at: https://www.cpc.ncep.noaa.gov/products/predictions/threats/threats.php

HUN WATCHES/WARNINGS/ADVISORIES

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