Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 190, NWS Birmingham, AL

August 11, 2020Autauga County, Dallas County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 11, 2020, 3:12 PM CDT for Autauga County, Dallas County, Alabama. It was in force for 15 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, 2020, 3:12 PM CDT (20:12 UTC)
Expired
Aug 11, 2020, 3:27 PM CDT
In force
15 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Autauga County, AL, Dallas County, AL

The radar

The Birmingham radar (KBMX), 83 km from the middle of the area, began a volume at 20:12 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 nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 8.2 hours before the alert went out and 84 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2020-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 953 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2020-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
953 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
1192 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 11, 2:31 PM CDT, 41 minutes earlier.

Area forecast discussion, Aug 11, 2:31 PM CDT, 41 minutes before
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Hazardous weather outlook, Aug 11, 2:20 PM CDT, 52 minutes before
Hazardous Weather Outlook
National Weather Service Birmingham AL
220 PM CDT Tue Aug 11 2020

ALZ011>015-017>050-122230-
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-
220 PM CDT Tue Aug 11 2020

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

.DAY ONE...Outlook through Tonight.

Isolated strong to severe thunderstorms are possible this afternoon.
Brief damaging wind gusts of 60 mph or more and hail up to quarter
size could occur.

Heat indices may approach 105 degrees for areas along and west of
Interstate 65 this afternoon. Take extra precautions while outside.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Heat indices may approach 105 degrees Wednesday afternoon. Take
extra precautions while outside.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be needed
this afternoon and evening. Please follow all local, state, and CDC
guidelines in regards to travel.

In the hours before

Special weather statement, Aug 11, 2:25 PM CDT, 47 minutes before
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Local storm report, Aug 11, 2:33 PM CDT, 39 minutes before
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Special weather statement, Aug 11, 2:55 PM CDT, 17 minutes before
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Special weather statement, Aug 11, 3:02 PM CDT, 10 minutes before
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Local storm report, Aug 11, 3:05 PM CDT, 7 minutes before
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Special weather statement, Aug 11, 3:12 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 7:17 PM CDTSpecial Weather StatementBMXRussell43 min
Aug 10, 7:24 PM CDTSpecial Weather StatementBMXPike51 min
Aug 10, 7:49 PM CDTSpecial Weather StatementBMXBarbour41 min
Aug 10, 8:31 PM CDTSpecial Weather StatementBMXBarbour29 min
Aug 10, 9:24 PM CDTSpecial Weather StatementBMXMarshall51 min
Aug 11, 12:08 PM CDTSpecial Weather StatementBMXChilton37 min
Aug 11, 12:27 PM CDTSpecial Weather StatementBMXWilcox33 min
Aug 11, 12:47 PM CDTSevere Thunderstorm WarningBMXBarbour, Pike23 min
Aug 11, 1:23 PM CDTSpecial Weather StatementBMXTallapoosa37 min
Aug 11, 1:24 PM CDTSpecial Weather StatementBMXElmore36 min
Aug 11, 1:30 PM CDTSpecial Weather StatementBMXLowndes30 min
Aug 11, 1:37 PM CDTSevere Thunderstorm WarningBMXLowndes22 min
Aug 11, 1:56 PM CDTSpecial Weather StatementBMXMontgomery34 min
Aug 11, 2:01 PM CDTSpecial Weather StatementBMXLowndes29 min
Aug 11, 2:14 PM CDTSpecial Weather StatementBMXLowndes31 min
Aug 11, 2:21 PM CDTSpecial Weather StatementBMXJefferson24 min
Aug 11, 2:25 PM CDTSpecial Weather StatementBMXLee35 min
Aug 11, 2:36 PM CDTSevere Thunderstorm WarningBMXElmore, Montgomery39 min
Aug 11, 2:55 PM CDTSpecial Weather StatementBMXAutauga35 min
Aug 11, 3:02 PM CDTSpecial Weather StatementBMXPike28 min
Aug 11, 3:05 PM CDTSevere Thunderstorm WarningBMXPike28 min
Aug 11, 3:12 PM CDTSpecial Weather StatementBMXMacon48 min
Aug 11, 3:37 PM CDTSpecial Weather StatementBMXPike38 min
Aug 11, 4:00 PM CDTSpecial Weather StatementBMXBullock30 min
Aug 11, 4:20 PM CDTSpecial Weather StatementBMXBullock40 min
Aug 11, 5:11 PM CDTSpecial Weather StatementBMXPerry34 min
Aug 11, 5:32 PM CDTSpecial Weather StatementBMXMarengo43 min
Aug 11, 5:37 PM CDTSpecial Weather StatementBMXJefferson23 min
Aug 11, 5:59 PM CDTSpecial Weather StatementBMXShelby31 min
Aug 11, 6:02 PM CDTSpecial Weather StatementBMXPerry43 min
Aug 11, 6:06 PM CDTSpecial Weather StatementBMXGreene39 min
Aug 11, 6:55 PM CDTSpecial Weather StatementBMXTuscaloosa35 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2020Every severe thunderstorm warning in 2020

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.