The upper air pattern transitioned from west to northwest flow across Alabama during this time period. 8 inches combined with increasing mid level lapse rates to create favorbale conditions for heavy rainfall and strong thunderstorm winds.
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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 BMX wrote it up.
The upper air pattern transitioned from west to northwest flow across Alabama during this time period. Deep moisture with PWAT's above 1.8 inches combined with increasing mid level lapse rates to create favorbale conditions for heavy rainfall and strong thunderstorm winds.
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 Birmingham, AL wrote its last area forecast discussion before the first event at Jun 11, 5:32 AM CST, 4 hours 28 minutes earlier.
Area Forecast Discussion National Weather Service Birmingham AL 632 AM CDT Fri Jun 11 2021 .UPDATE... For 12Z Aviation. && .SHORT TERM... /Updated at 0330 AM CDT Fri Jun 11 2021/ Through Saturday. The broad mid to upper level troughing centered over the Ohio Valley will continue to slowly slide eastward today. However, we remain in a very wet pattern through Saturday. Today's rain chances chances look to be the highest of the next 2 days and already are being realized with convection in northern MS. Showers and storms will continue to build and develop this morning and into the afternoon across northern MS and AL and then slide east-southeast through the day. Will once again go with well above normal rain chances for the area. We will need to monitor any training through the morning and into the afternoon as convection increases across the area. Added in the threat to HWO for the west, but will hold off on a Flash Flood Watch as activity, while widespread, may only result in locally heavy rainfall totals. Coverage decreases in the evening, but isolated to scattered showers/storms will remain possible as they have for the past week. The next round should be further south on Saturday, with the highest rain chances across the souther counties. 16 .LONG TERM... /Updated at 0330 AM CDT Fri Jun 11 2021/ Sunday through Thursday. A mid- to upper-level ridge will increase its prominence across the western CONUS Sunday and into early next week. Medium-range guidance suggests H5 heights ~600 dam near the Colorado Rockies by Tuesday. Meanwhile, the amplifying jet stream will feature a strong longwave trough across Quebec and Ontario before rotating into the Northeast by mid next week. With these extensive synoptic feature in play in place to our west and to our north, antecedent weaknesses aloft across the Southeast will continue slowly displace toward the Gulf Coast and FL Peninsula on Sunday. This will coincide with transition to northerly flow across Central AL and decreasing diurnally-driven convective rain chances as lower tropospheric moisture content settles over the Deep South. Best PoPs are across the southern forecast area for Sunday due to proximity to better moisture and the lingering, elongated upper- level trough stretched along the northern Gulf Coast. This sort of PoP trend is expected to persist for much of the extended forecast period as we remain in a relatively slow moving pattern across the CONUS, generally speaking. Temperatures will be a trade off as drier air will help increase diurnal temperature ranges. Highs in the upper 80s to lower 90s are expected through Wednesday. Throughout this time daily convective activity should remain maximized near the I-10 corridor where the sea breeze will foster showers/thunderstorms along an axis of relatively high theta-e content positioned along the Gulf Coast. 40/Sizemore && .AVIATION... 12Z TAF Discussion. Low clouds and scattered showers out there this morning. Impact wise the activity has held off at most sites. Look for the clouds to lift and we will see more activity blossom through the morning and into the afternoon, with showers/storms becoming widespread once again. Impacts will be most felt by the showers/storms briefly as activity will move fairly briskly from west to east. Note: AMD NOT SKED until further notice at KASN due to ongoing equipment issues. Also KTOI has 16 && .FIRE WEATHER... Relative humidity values remain quite elevated for the next couple of days with scattered to numerous showers and thunderstorms, mainly during the afternoons. Depending on the rain coverage, patchy fog will be possible each night. West-southwest 20 ft winds are expected today at 5-10 mph. Winds become more northwesterly by Saturday. A decreasing moisture trend is expected Sunday and early next week. This will decrease overall rain chances and allow for warmer afternoons. && .PRELIMINARY POINT TEMPS/POPS... Gadsden 86 69 91 69 91 / 80 40 40 10 20 Anniston 85 71 90 70 90 / 80 50 50 10 20 Birmingham 85 71 90 71 91 / 80 50 50 20 20 Tuscaloosa 85 71 91 72 92 / 80 50 50 20 30 Calera 84 71 90 72 91 / 80 50 50 20 20 Auburn 83 71 87 71 89 / 80 60 60 20 20 Montgomery 89 72 92 72 93 / 80 60 60 20 30 Troy 88 71 90 72 92 / 80 60 70 20 30 && .BMX WATCHES/WARNINGS/ADVISORIES/... None. &&
Hazardous Weather Outlook National Weather Service Birmingham AL 807 AM CDT Fri Jun 11 2021 ALZ011>015-017>050-121615- Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee- Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega- Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa- Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon- Bullock-Lee-Russell-Pike-Barbour- 807 AM CDT Fri Jun 11 2021 This Hazardous Weather Outlook is for the counties served by the National Weather Service office in Birmingham. .DAY ONE...Outlook through Tonight. Numerous showers and thunderstorms will impact Central Alabama through the evening hours. With heavy downpours at times and storms moving over already saturated ground, there will be a chance for localized flooding across northern and central portions of Central Alabama. Minor flooding is expected to develop along the Tombigbee River basin today. Please see river flood statements for specific details. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Minor flooding is expected to continue along portions of the Tombigbee River basin on through at least Tuesday. Please see river flood statements for specific details. .SPOTTER INFORMATION STATEMENT... Activation of storm spotters and emergency management is not expected at this time.
The Columbus AFB radar (KGWX), 72 km away, was scanning. The volume nearest the first event began at 15:58 UTC.
9 thunderstorm wind, 1 flash flood, 1 hail. Local standard time, as filed.
Several roads flooded and impassable across northern Tuscaloosa County. The flooded roads include Highway 171 near Mormon Road, Homeplace Road, Jackson Trace Road, and several roads in the town of New Lexington.
Several trees uprooted across County Road 1 near Fig Tree Drive.
Several trees uprooted and power lines downed along Highway 5.
Several trees uprooted and power lines downed along Walter Shirley Road.
Several trees uprooted in the town of Knoxville.
Several trees uprooted along County Road 187 near the intersection of County Road 84.
Trees uprooted and power lines downed in the town of Eldridge.
Trees uprooted and power lines downed along Vick Road.
Trees uprooted and power lines downed along Highway 63.
Nickel size hail east of Cottondale.
Several trees uprooted and power lines downed along Saragossa Road.
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, June 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: 967343, 967634, 967638, 967637, 970535, 967636, 967640, 967642, 967641, 967643, 967639.