Temperatures climbing into the lower 90s and a very humid airmass (dewpoints 76 degrees) ahead of a passing boundary during the afternoon hours produced heat index values between 105 to 107 degrees in portions of northwest Alabama and north central Alabama.
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The episode as NWS HUN wrote it up.
Temperatures climbing into the lower 90s and a very humid airmass (dewpoints 76 degrees) ahead of a passing boundary during the afternoon hours produced heat index values between 105 to 107 degrees in portions of northwest Alabama and north central Alabama.
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 Jul 26, 9:53 AM CST, 1 hour 7 minutes earlier.
Area Forecast Discussion National Weather Service Huntsville AL 1053 AM CDT Mon Jul 26 2021 .NEAR TERM...(Rest of Today) Issued at 1053 AM CDT Mon Jul 26 2021 Patchy dense fog that sharply reduced visibilities over portions of NE Alabama (like Ft Payne and wind sheltered valleys) has dissipated with daytime heating and mixing. Temperatures were rising through the mid/upper 80s. This has reached convective temperatures, with CU/TCU formation in progress. A more notable CU field extending from east of Tupelo to Huntsville and Lynchburg has resulted in showers already forming over parts of NW and north central Alabama. Expect more showers and thunderstorms to form during the course of the late morning continuing into the afternoon. Morning soundings from OHX and BMX both have precip water amounts in the 2 inch range. Current slow cell movement per our new convection and convection on- going on the south side of Nashville, will bring chances of locally heavy rain and a potential of flash flooding mainly this afternoon. Have lowered high temperatures a degree or two given the formation of clouds and showers. Afternoon heat indexes will still rise into the 100-104 degree range in areas unaffected by showers. Otherwise, the overall forecast for the rest of the day appears to be on track. .SHORT TERM...(Tonight through Wednesday) Issued at 520 AM CDT Mon Jul 26 2021 Models indicate little change in the synoptic regime overnight, with low probabilities for showers and thunderstorms expected to persist for much of the night, given the number of outflow boundaries that will likely be in the region. We have indicated a low chance POP for the evening hours and reduced this to slight chance during the early morning hours on Tuesday, when patchy fog may also occur in a few locations. During the period from Tuesday-Wednesday, the subtropical high positioned across the central Rockies will begin to intensify and shift east-southeastward into the central Plains. A stronger northeasterly flow aloft will become established across the local area, as an amplifying ridge attached to the high begins to build southeastward, with the advection of drier air aloft and a general increase in subsidence warranting a rapid decrease in POPs on Tuesday night/Wednesday. However, before this occurs, we still anticipate scattered-numerous showers and thunderstorms on Tuesday afternoon. Although highs will be a few degrees cooler on Tuesday due to more cloud cover during the morning, temps will soar back into the l-m 90s on Wednesday, with a Heat Advisory possible for portions of the CWFA.as several disturbance will track southeastward in this flow regime and interact with a stalled frontal boundary. .LONG TERM...(Wednesday night through Sunday) Issued at 520 AM CDT Mon Jul 26 2021 Strong ridging aloft will remain the dominant feature of interest from Wednesday night-Thursday night, with the hottest day of the summer (thus far) expected on Thursday, when highs will reach the m-u 90s. Although some mixing of the boundary layer moisture will allow for slightly lower dewpoints (u60s-l70s), predicted heat index values are still several degrees above Heat Advisory criteria for most of the forecast area. The subtropical ridge will slowly begin to break down and shift southwestward beginning on Friday, as a longwave trough amplifies across eastern Canada. It appears as if a slightly more defined cold front will push southward into the region late Friday afternoon, with a few showers and thunderstorms possible. As the influence of the subtropical ridge diminishes this weekend, deep- layer northwest flow will strengthen across the TN Valley, which could result in a rather active period of convection, some of which could be strong-severe based on a favorable combination of shear and instability. && .AVIATION...(For the 12Z TAFS through 12Z Tuesday morning) Issued at 705 AM CDT Mon Jul 26 2021 Conditions remain VFR at the HSV/MSL terminals early this morning, and although some patchy BR/FG is being reported around the region, it does not appear as if vsby reductions will impact the terminals. SHRA/TSRA are expected to develop later this morning, with coverage invof the terminals greatest during the 21-03Z timeframe, when PROB30 groups have been included in the forecast. The storms will be slow- moving, and could bring heavy rainfall/frequent lightning and brief wind gusts of 40-45 knots in addition to MVFR cigs/vsby. Although a few showers and storms could persist thru the end of the valid TAF period, we have indicated a return to prevailing VFR conditions after 03Z. Sfc winds away from convection will be lgt/vrbl for much of the period, with a slightly more defined SW flow expected during the afternoon hours. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...NONE. TN...NONE. && NEAR TERM...RSB SHORT TERM...70/DD LONG TERM...70/DD AVIATION...70/DD For more information please visit our website at weather.gov/huntsville.
Hazardous Weather Outlook National Weather Service Huntsville AL 640 AM CDT Mon Jul 26 2021 ALZ001>010-016-TNZ076-096-097-271130- Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan- Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN- 640 AM CDT Mon Jul 26 2021 This Hazardous Weather Outlook is for north Alabama and portions of southern middle Tennessee. .DAY ONE...Today and Tonight... Numerous thunderstorms are anticipated across the Tennessee Valley today, with the greatest coverage occurring during the afternoon and early evening hours. Although the coverage of thunderstorms will diminish overnight, a few storms could occur through sunrise. Wind gusts of 40 to 50 MPH and frequent cloud to ground lightning will be possible with the strongest cells. Due to slow storm motions and high rainfall rates, flash flooding will also be possible in localized areas. For locations in northwest and north central Alabama that do not experience a cooling shower or storm today, dangerously high heat index values in the 100-105 degree range are expected. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... Scattered to numerous thunderstorms are expected on Tuesday, with only isolated storms anticipated south of the Tennessee River on Wednesday. After a break in precipitation on Thursday, scattered thunderstorms will return to the region from Friday through Sunday. Dangerously high heat indices in the 100 to 105 degree range are expected for most locations in the Tennessee Valley on Wednesday, Thursday and Friday. .SPOTTER CALL TO ACTION STATEMENT... Activation of storm spotters and emergency management personnel is not anticipated at this time. 70/DD
The national radar mosaic for the moment the first event began.
3 heat. Local standard time, as filed.
Temperatures climbed into the lower 90s during the late morning and early afternoon hours. Very humid conditions produced dangerous heat index values between 105 and 106 degrees at the Muscle Shoals airport.
Temperatures climbed into the lower 90s during the late morning and early afternoon hours. Very humid conditions produced dangerous heat index values between 105 and 106 degrees in the Quad Cities area.
Temperatures climbed into the lower 90s during the late morning and early afternoon hours. Very humid conditions produced dangerous heat index values between 105 and 106 degrees at the Huntsville International Airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Alabama in 2021Every state in 2021This day in weather historyWarnings in Alabama, July 2021
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: 976628, 976629, 976630.