The combination of hot temperatures and high humidity produced heat index values that reached or exceeded 105 degrees at times during the daytime hours during the period. High temperatures reached to the upper 90s to around 100.
Every event with a place to put it; 12 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS HUN wrote it up.
The combination of hot temperatures and high humidity produced heat index values that reached or exceeded 105 degrees at times during the daytime hours during the period. High temperatures reached to the upper 90s to around 100. Overnight low temperatures were only in the lower to middle 70s.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Huntsville, AL wrote its last area forecast discussion before the first event at Aug 16, 10:36 AM CST, 2 hours 24 minutes earlier.
Area Forecast Discussion National Weather Service Huntsville AL 1136 AM CDT Sat Aug 16 2025 ...New AVIATION... .NEAR TERM... (Rest of Today and Tonight) Issued at 1035 AM CDT Sat Aug 16 2025 After a very foggy morning, clear skies have allowed nearly all of the dense fog to erode save for a few valleys in NE AL. Clear conditions will prevail for the next few hours which will support the full erosion of any lingering fog. Through the day today, mid level ridging over the Ozarks will continue to amplify and nudge east. Locally this will amount to rather hot day as the mostly clear skies under high pressure support afternoon temps in the mid 90s with heat indices near and just above 100. For those partaking in outdoor activities make sure to practice proper heat and sun safety. A low (10-20%) chance of storms will be possible in NE AL supported by NNE flow along the eastern periphery of the ridge. While the synoptic support will be very weak, hence the low chances, if any storms do develop they will be in a favorable environment for heavy rainfall, gusty winds, and frequent lighting. Any storms that do develop will wane through sunset with clear and calm conditions developing overnight. && .SHORT TERM... (Sunday through Tuesday) Issued at 1035 AM CDT Sat Aug 16 2025 Ridging will remain anchored over the Ozarks through the short term forecast leading to an unpleasant warming trend in our temperatures. High pressure influence will largely suppress rain chances through the middle of the work week. Under mostly clear skies, temps will rise from the mid 90s on Sunday to the high 90s by Tuesday. The persistent ENE flow at the surface will maintain our mid 70s dew points amounting to heat indices above 100 for a majority of the area each day. With the current forecast, Monday looks to be the first day we would consider issuing heat products for, however we will postpone that decision until future forecast updates. Regardless of the issuance of products or not, it will be important to continue to practice proper heat and sun safety for those participating in outdoor activities. && .LONG TERM... (Tuesday through Friday) Issued at 1039 PM CDT Fri Aug 15 2025 The latest suite of global models indicates that our region will remain under the influence of a zonally-oriented mid-level ridge (extending from the central Plains into the TN Valley) on Tuesday/Wednesday. Although the ridge will continue to break down as a shortwave trough drops southeastward into IL/IN/OH, two additional days of dangerous heat are anticipated as highs will reach the m-u 90s with HI in excess of Advisory criteria for much of the lower elevation portion of our forecast area. Present indications are that thunderstorm coverage may increase a bit on Tuesday, as prevailing easterly flow aloft will be favorable for terrain-induced convection across eastern TN/western NC/northern GA to spread into our forecast area. However, by Wednesday, we will need to shift our focus to the northwest, as a small MCS may evolve late Wednesday morning from eastern MO into southern IN when the shortwave interacts with a weak cool front in the same general area. If this scenario materializes, substantial upscale growth of this system could occur as outflow encounters a very unstable airmass across the TN Valley, with a potentially more widespread damaging wind event possible late Wednesday afternoon or evening. A similar event may occur on Thursday as the decaying mid-level trough axis sinks further southeastward and initiates storms along the cool front (still positioned to our north), and with the trough and surface boundary expected to be aligned across our region Friday, periods of showers and storms can be expected throughout the day. Fortunately, instability will be on a decreasing trends as we head into Friday, and heat concerns will also diminish as afternoon highs fall back into the m-u 80s. && .AVIATION... (18Z TAFS) Issued at 1136 AM CDT Sat Aug 16 2025 VFR conditions will prevail for the duration of the TAF period at both terminals. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...None. TN...None. && NEAR TERM...RAD SHORT TERM....RAD LONG TERM....70 AVIATION...RAD
The national radar mosaic for the moment the first event began.
12 heat. Local standard time, as filed.
The heat index reached or exceeded 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached or exceeded 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached or exceeded 105 degrees at times during the afternoon hours.
The heat index reached or exceeded 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached or exceeded 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached or exceeded 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached or exceeded 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached or exceeded 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached or exceeded 105 degrees briefly during the afternoon.
The heat index reached 105 degrees at times during the daytime hours. Overnight low temperatures were only in lower to middle 70s.
The heat index reached 105 degrees briefly during the afternoon hours of the 20th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Alabama in 2025Every state in 2025This day in weather historyWarnings in Alabama, August 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1288340, 1288341, 1288345, 1288348, 1288336, 1288337, 1288338, 1288344, 1288339, 1288349, 1288346, 1288343.