Alert archive / Alabama / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 418, NWS Birmingham, AL

August 11, 2023Coosa County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 11, 2023, 5:06 PM CDT for Coosa County, Alabama. It was in force for 12 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 11, 2023, 5:06 PM CDT (22:06 UTC)
Expired: Aug 11, 2023, 5:18 PM CDT
In force: 12 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Coosa County, AL

The radar

The Birmingham radar (KBMX), 55 km from the middle of the area, began a volume at 22:06 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 11, 2:10 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.1 hours before the alert went out and 57 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: 2369 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 605 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.9

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 11, 4:09 PM CDT, 57 minutes earlier.

Area forecast discussion, Aug 11, 4:09 PM CDT, 57 minutes before

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Hazardous weather outlook, Aug 11, 3:15 PM CDT, 1 hour 51 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
315 PM CDT Fri Aug 11 2023

ALZ011>015-017>050-122315-
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-
315 PM CDT Fri Aug 11 2023

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...Outlook through Tonight.

Severe thunderstorms are possible through 7 pm this evening. The risk
area includes locations near and south of I-20. The main threats will
be damaging winds and large hail.

The combination of high temperatures and high surface dew points will
create a feels like temperature from 105 to 109 degrees today. The
threat area is generally west of I-22 and the US 280 corridor. This
roughly covers the western two thirds of central Alabama.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Severe thunderstorms are possible again on Saturday. The threat
window appears to be from noon to 7 pm for the northeast half of the
area. Please see graphic for specific locations. The main threats
will be damaging winds and large hail.

The hot area today will increase on Saturday. The western area will
have an Excessive Heat Warning where heat indices will be 110 or
greater. The remainder of central Alabama will also increase in the
feels like temperature and a Heat Advisory has been issued.

Heat and humidity will produce dangerous conditions through Tuesday.
Heat indices will be 105 or greater each afternoon in various
locations across central Alabama.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
this afternoon and Saturday afternoon.

In the hours before

Local storm report, Aug 11, 4:37 PM CDT, 29 minutes before

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Special weather statement, Aug 11, 4:40 PM CDT, 26 minutes before

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Special weather statement, Aug 11, 4:47 PM CDT, 19 minutes before

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Local storm report, Aug 11, 4:48 PM CDT, 18 minutes before

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Local storm report, Aug 11, 4:49 PM CDT, 17 minutes before

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Local storm report, Aug 11, 5:05 PM CDT, 1 minute 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, 1:22 AM CDT	Special Weather Statement	BMX	Lamar	38 min
Aug 11, 2:02 AM CDT	Areal Flood Advisory	BMX	Fayette, Lamar, Marion, Walker, Winston	118 min
Aug 11, 2:09 AM CDT	Special Weather Statement	BMX	Blount, Fayette, Walker	36 min
Aug 11, 2:38 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Tuscaloosa, Walker	52 min
Aug 11, 2:47 AM CDT	Special Weather Statement	BMX	Walker	43 min
Aug 11, 3:13 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Tuscaloosa, Walker	47 min
Aug 11, 3:22 AM CDT	Special Weather Statement	BMX	Jefferson	38 min
Aug 11, 3:31 AM CDT	Special Weather Statement	BMX	Blount, Etowah	44 min
Aug 11, 3:38 AM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, St. Clair	52 min
Aug 11, 3:47 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson	43 min
Aug 11, 3:52 AM CDT	Areal Flood Advisory	BMX	Blount, Jefferson, Walker	3 hr
Aug 11, 3:58 AM CDT	Heat Advisory	BMX	Autauga, Barbour, Bibb, Bullock, Chilton, Coosa and 24 more	17 hr
Aug 11, 4:11 AM CDT	Special Weather Statement	BMX	Shelby	49 min
Aug 11, 4:24 AM CDT	Special Weather Statement	BMX	St. Clair	36 min
Aug 11, 4:37 AM CDT	Special Weather Statement	BMX	Etowah	38 min
Aug 11, 4:51 AM CDT	Special Weather Statement	BMX	Talladega	39 min
Aug 11, 5:10 AM CDT	Special Weather Statement	BMX	Shelby	35 min
Aug 11, 5:28 AM CDT	Special Weather Statement	BMX	Cleburne	32 min
Aug 11, 5:41 AM CDT	Special Weather Statement	BMX	Talladega	34 min
Aug 11, 6:01 AM CDT	Special Weather Statement	BMX	Randolph	44 min
Aug 11, 6:14 AM CDT	Special Weather Statement	BMX	Clay, Talladega	46 min
Aug 11, 6:37 AM CDT	Severe Thunderstorm Warning	BMX	Tallapoosa	38 min
Aug 11, 6:48 AM CDT	Special Weather Statement	BMX	Chambers	42 min
Aug 11, 7:16 AM CDT	Special Weather Statement	BMX	Chambers	44 min
Aug 11, 9:27 AM CDT	Special Weather Statement	BMX	Tallapoosa	33 min
Aug 11, 9:49 AM CDT	Special Weather Statement	BMX	Chambers	41 min
Aug 11, 12:10 PM CDT	Excessive Heat Warning	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	3 days
Aug 11, 12:10 PM CDT	Heat Advisory	BMX	Blount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 8 more	62 hr
Aug 11, 12:46 PM CDT	Special Weather Statement	BMX	Lee	59 min
Aug 11, 12:49 PM CDT	Severe Thunderstorm Warning	BMX	Lee	56 min
Aug 11, 1:09 PM CDT	Special Weather Statement	BMX	Coosa	66 min
Aug 11, 1:38 PM CDT	Special Weather Statement	BMX	Russell	52 min
Aug 11, 1:42 PM CDT	Severe Thunderstorm Warning	BMX	Lee, Russell	48 min
Aug 11, 1:49 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Coosa, Tallapoosa	56 min
Aug 11, 2:12 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Lee, Macon, Tallapoosa	78 min
Aug 11, 2:23 PM CDT	Severe Thunderstorm Warning	BMX	Russell	52 min
Aug 11, 2:37 PM CDT	Areal Flood Advisory	BMX	Lee	3 hr
Aug 11, 2:51 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Lee, Macon, Russell	57 min
Aug 11, 3:25 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Russell	32 min
Aug 11, 3:33 PM CDT	Special Weather Statement	BMX	Elmore	42 min
Aug 11, 3:47 PM CDT	Special Weather Statement	BMX	Macon	28 min
Aug 11, 4:03 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Macon, Montgomery	42 min
Aug 11, 4:19 PM CDT	Special Weather Statement	BMX	Elmore	26 min
Aug 11, 4:40 PM CDT	Special Weather Statement	BMX	Bullock, Montgomery, Pike	50 min
Aug 11, 4:47 PM CDT	Special Weather Statement	BMX	Elmore	43 min
Aug 11, 5:33 PM CDT	Special Weather Statement	BMX	Montgomery	42 min
Aug 11, 5:36 PM CDT	Areal Flood Advisory	BMX	Elmore	3 hr
Aug 11, 5:53 PM CDT	Special Weather Statement	BMX	Walker	37 min
Aug 11, 5:57 PM CDT	Special Weather Statement	BMX	Montgomery	48 min
Aug 11, 6:29 PM CDT	Special Weather Statement	BMX	Clay	46 min
Aug 11, 6:38 PM CDT	Special Weather Statement	BMX	Autauga, Chilton, Lowndes	37 min
Aug 11, 6:52 PM CDT	Special Weather Statement	BMX	Jefferson	38 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.