Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 188, NWS Birmingham, AL

August 11, 2020Elmore County, Montgomery County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 11, 2020, 2:36 PM CDT for Elmore County, Montgomery County, Alabama. It was in force for 39 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, 2:36 PM CDT (19:36 UTC)
Expired
Aug 11, 2020, 3:15 PM CDT
In force
39 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Elmore County, AL, Montgomery County, AL

The radar

The Maxwell AFB radar (KMXX), 39 km from the middle of the area, began a volume at 19:39 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, 7.6 hours before the alert went out and 103 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, 5 minutes earlier.

Area forecast discussion, Aug 11, 2:31 PM CDT, 5 minutes before
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Hazardous weather outlook, Aug 11, 2:20 PM CDT, 16 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

Local storm report, Aug 11, 1:57 PM CDT, 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
157 PM CDT TUE AUG 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0150 PM     TSTM WND GST     DANNELLY FIELD          32.30N 86.39W
08/11/2020  E59 MPH          MONTGOMERY         AL   ASOS

            MGM 51KTS 1850.

&&

MAL
Special weather statement, Aug 11, 2:01 PM CDT, 35 minutes before
Special Weather Statement
National Weather Service Birmingham AL
201 PM CDT Tue Aug 11 2020

ALZ042-111930-
Lowndes AL-
201 PM CDT Tue Aug 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LOWNDES COUNTY UNTIL
230 PM CDT...

At 201 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Hayneville to near Logan. Movement was
southeast at 10 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Fort Deposit, Mosses, Hayneville, Gordonville, Logan, Beechwood,
Calhoun and Letohatchee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3215 8672 3225 8661 3216 8646 3210 8641
      3205 8641 3204 8640 3201 8640 3196 8641
      3196 8656
TIME...MOT...LOC 1901Z 311DEG 11KT 3218 8662 3200 8642

89^GSatterwhite
Special weather statement, Aug 11, 2:14 PM CDT, 22 minutes before
Special Weather Statement
National Weather Service Birmingham AL
214 PM CDT Tue Aug 11 2020

ALZ040-042-111945-
Lowndes AL-Dallas AL-
214 PM CDT Tue Aug 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LOWNDES AND EAST
CENTRAL DALLAS COUNTIES UNTIL 245 PM CDT...

At 214 PM CDT, Doppler radar was tracking a strong thunderstorm over
Benton, or 11 miles east of Selmont-West Selmont, moving east at 5
mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
White Hall, Benton and Tyler.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3221 8688 3233 8692 3240 8684 3236 8681
      3231 8682 3231 8681 3234 8677 3239 8678
      3239 8675 3240 8672 3236 8671 3235 8668
      3236 8666 3232 8665 3221 8667 3219 8678
TIME...MOT...LOC 1914Z 274DEG 4KT 3232 8681

89^GSatterwhite
Special weather statement, Aug 11, 2:21 PM CDT, 15 minutes before
Special Weather Statement
National Weather Service Birmingham AL
221 PM CDT Tue Aug 11 2020

ALZ024-111945-
Jefferson AL-
221 PM CDT Tue Aug 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL JEFFERSON COUNTY
UNTIL 245 PM CDT...

At 221 PM CDT, Doppler radar was tracking a strong thunderstorm near
Tannehill Ironworks State Park, or near Bessemer. This storm was
nearly stationary.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Bessemer, Promenade Tannehill, Bent Brook Golf Club, Bessemer Airport
and McAdory.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3334 8700 3331 8690 3330 8693 3328 8693
      3327 8695 3327 8697 3325 8698 3325 8707
      3328 8707 3328 8708 3330 8708
TIME...MOT...LOC 1921Z 274DEG 4KT 3329 8701

89^GSatterwhite
Special weather statement, Aug 11, 2:25 PM CDT, 11 minutes before
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Local storm report, Aug 11, 2:33 PM CDT, 3 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, 2:55 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, 3:12 PM CDTSevere Thunderstorm WarningBMXAutauga, Dallas15 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.