254 FXUS64 KHUN 290509 AFDHUN Area Forecast Discussion National Weather Service Huntsville AL 1209 AM CDT Mon Jun 29 2026 ...New AVIATION... .KEY MESSAGES... Updated at 1022 PM CDT Sun Jun 28 2026 - A heat wave will occur this week with a Heat Risk value of 3 out of 4 (Major category) to 4 out of 4 (Extreme category). - A Heat Advisory is in effect through 7 PM Tuesday. && .NEAR TERM... (Rest of tonight and Monday) Issued at 1022 PM CDT Sun Jun 28 2026 As of nearly 10pm this evening, the beginning effects of the heatwave can be felt as current temps range from the upper 70s to low/mid 80s. Overnight lows will remain on the warm side with temps only falling to the mid 70s by tomorrow morning. Dewpoint depressions should be large enough to keep fog at bay tonight despite clear skies and light winds. Even warmer conditions are forecast on Monday as a 594dam high centers over the TN Valley and southwesterly low level flow keeps tropical air flowing into the area. Temps will rise to the mid/upper 90s during the afternoon. This combined with dewpoints in the low/mid 70s will bring heat indices to the 100-107 degree mark, creating a heightened risk for heat related illness for those without proper hydration and cooling. A Heat Advisory will remain in effect into the short term period, reminding residents to stay hydrated, take frequent breaks from the heat, and never leave people or pets in vehicles! High pressure aloft will keep dry conditions in place through tomorrow. && .SHORT TERM... (Monday night through Wednesday night) Issued at 1022 PM CDT Sun Jun 28 2026 Unfortunately, conditions will not improve for the foreseeable future as upper ridging remains anchored over the eastern US. Heat indices will rise to the 100-110 range through Wednesday and beyond, making for a dangerous heat wave during a time where outdoor activity is heightened. Afternoon temps are forecast to rise to the 95-98 degree range each afternoon with dewpoints in the mid 70s. We will feel no relief overnight as well as temps only fall to the mid to upper 70s. Although the synoptic support for thunderstorms appears weak at this time, a few weaker impulses embedded within the upper high may be enough to generate a few thunderstorms Tuesday and Wednesday afternoons, primarily over NE AL where some terrain enhanced lift may be realized. The Heat Advisory will at least need to be extended through the remainder of the short term period in future forecast updates. && .LONG TERM... (Thursday through Sunday) Issued at 1022 PM CDT Sun Jun 28 2026 The upper ridge will slowly make its way towards the eastern seaboard through Friday. By Saturday, ripples of shortwaves will traverse the Mississippi Valley into the Ohio and Tennessee valleys for the weekend, further weakening the influence of the ridge. At the surface, high pressure will maintain its hold over the Appalachians and into the Southeastern states through Sunday. Guidance indicates that moisture levels increase a bit more by late in the weekend as well (PWATs generally between 1.7-2.0 inches). Overall, expect a diurnal pattern to emerge by late week with daily chances of showers and storms, with generally low to medium chances (20-50%) each day. Severe weather is not anticipated at this time; however, with such warm and humid conditions, would not be surprised if the downburst potential increased by the weekend. Even with increasing shower and storm chances that may dampen the heat a bit, these will be our usual brief, summertime pop up thunderstorms and not every location will see rain. Ultimately, the hot conditions will continue through Saturday at least until increased rain chances result in a slight cooldown for Sunday. Highs are forecast to remain in the mid to upper 90s with lows in the lower to mid 70s across north Alabama and southern middle Tennessee through Saturday. With elevated moisture, heat indices range between 100-109 degrees. NWS HeatRisk will also remain in the Major to Extreme categories (Levels 3 and 4 of 4) which are due in part to the compounding heat from earlier in the week. Lastly, forecast WBGTs generally range in the 87-90 degree range during the afternoons each day through Saturday. Therefore, heat products will likely be needed through late week. Make sure to take precautions for the dangerous heat! Wear light- colored, loose- fitting clothing, stay hydrated, and take frequent breaks in the shade if you work outside or have outdoor activities! Look before you lock - never leave people or pets in vehicles! && .AVIATION... (06Z TAFS) Issued at 1208 AM CDT Mon Jun 29 2026 VFR conditions will prevail through the period, with light SW winds and mostly clear sky. && .CLIMATE... Issued at 655 PM CDT Sun Jun 28 2026 Moderate Risk for Much Above Normal Temperatures: The Climate Prediction Center has included northwest Alabama in a Moderate Risk for Much Above Normal Temperatures on July 6. This means that there is a medium chance (40-60%) for temperatures to reach or exceed 93-95 degrees with heat indices above 105 degrees 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...Heat Advisory until 7 PM CDT Tuesday for ALZ001>010-016. TN...Heat Advisory until 7 PM CDT Tuesday for TNZ076-096-097. && $$ NEAR TERM...25 SHORT TERM....25 LONG TERM....26 AVIATION...AMP.24