Alert archive / Alabama / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 424, NWS Birmingham, AL

August 12, 20234 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 12, 2023, 3:29 PM CDT for 4 counties in Alabama. It was in force for 76 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 12, 2023, 3:29 PM CDT (20:29 UTC)
Expired: Aug 12, 2023, 4:45 PM CDT
In force: 76 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Etowah County, AL

The radar

The Northeast Alabama radar (KHTX), 117 km from the middle of the area, began a volume at 20:30 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 12, 10:50 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 8.5 hours before the alert went out and 126 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3151 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 810 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Aug 12, 2:54 PM CDT, 35 minutes earlier.

Area forecast discussion, Aug 12, 2:54 PM CDT, 35 minutes before

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Hazardous weather outlook, Aug 12, 4:30 AM CDT, 10 hours 59 minutes before

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In the hours before

Special weather statement, Aug 12, 2:10 PM CDT, 1 hour 19 minutes before

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Special weather statement, Aug 12, 2:50 PM CDT, 39 minutes before

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Local storm report, Aug 12, 3:02 PM CDT, 27 minutes before

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Local storm report, Aug 12, 3:04 PM CDT, 25 minutes before

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Special weather statement, Aug 12, 3:14 PM CDT, 15 minutes before

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Local storm report, Aug 12, 3:25 PM CDT, 4 minutes before

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The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 7:14 PM CDT	Special Weather Statement	BMX	Jefferson	46 min
Aug 11, 7:19 PM CDT	Areal Flood Advisory	BMX	Autauga	3 hr
Aug 11, 7:28 PM CDT	Special Weather Statement	BMX	Jefferson	47 min
Aug 11, 7:41 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	49 min
Aug 11, 8:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BMX	Chilton, Coosa, Shelby	41 min
Aug 11, 8:36 PM CDT	Special Weather Statement	BMX	Coosa	39 min
Aug 11, 8:41 PM CDT	Severe Thunderstorm Warning	BMX	Chilton, Coosa	27 min
Aug 12, 2:08 PM CDT	Special Weather Statement	BMX	Randolph	37 min
Aug 12, 2:10 PM CDT	Special Weather Statement	BMX	Blount	50 min
Aug 12, 2:31 PM CDT	Severe Thunderstorm Warning	BMX	Blount	31 min
Aug 12, 2:47 PM CDT	Severe Thunderstorm Warning	BMX	Etowah, St. Clair	45 min
Aug 12, 2:50 PM CDT	Special Weather Statement	BMX	Coosa	40 min
Aug 12, 3:14 PM CDT	Special Weather Statement	BMX	Fayette, Lamar	46 min
Aug 12, 3:31 PM CDT	Special Weather Statement	BMX	St. Clair	29 min
Aug 12, 3:40 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar	50 min
Aug 12, 3:59 PM CDT	Special Weather Statement	BMX	Talladega	46 min
Aug 12, 4:13 PM CDT	Special Weather Statement	BMX	Tuscaloosa	47 min
Aug 12, 4:17 PM CDT	Special Weather Statement	BMX	Tallapoosa	28 min
Aug 12, 4:30 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Lee	55 min
Aug 12, 4:31 PM CDT	Special Weather Statement	BMX	Clay, Randolph	29 min
Aug 12, 4:36 PM CDT	Special Weather Statement	BMX	Jefferson	39 min
Aug 12, 5:01 PM CDT	Severe Thunderstorm Warning	BMX	Randolph	44 min
Aug 12, 5:17 PM CDT	Special Weather Statement	BMX	Chambers, Tallapoosa	43 min
Aug 12, 5:18 PM CDT	Special Weather Statement	BMX	Shelby	42 min
Aug 12, 5:25 PM CDT	Severe Thunderstorm Warning	BMX	Chambers	46 min
Aug 12, 5:27 PM CDT	Special Weather Statement	BMX	Barbour, Bullock, Russell	63 min
Aug 12, 5:47 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Tallapoosa	38 min
Aug 12, 5:49 PM CDT	Special Weather Statement	BMX	Coosa, Shelby	41 min
Aug 12, 6:26 PM CDT	Special Weather Statement	BMX	Coosa, Tallapoosa	49 min
Aug 12, 6:28 PM CDT	Special Weather Statement	BMX	Barbour, Bullock, Pike	62 min
Aug 12, 6:31 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Pike	32 min
Aug 12, 6:34 PM CDT	Severe Thunderstorm Warning	BMX	Coosa, Elmore, Tallapoosa	28 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2023 Every severe thunderstorm warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.