Alert archive / Alabama / Special Weather Statements in 2020

Special Weather Statement, NWS Birmingham, AL

August 11, 2020Tuscaloosa County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 11, 2020, 6:55 PM CDT for Tuscaloosa County, Alabama. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 11, 2020, 6:55 PM CDT (23:55 UTC)
Expired
Aug 11, 2020, 7:30 PM CDT
In force
35 min
Issued by
NWS Birmingham, AL

County Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 93 km from the middle of the area, began a volume at 23:56 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, 11.9 hours before the alert went out and 92 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

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 11, 2:31 PM CDT, 4 hours 24 minutes earlier.

Area forecast discussion, Aug 11, 2:31 PM CDT, 4 hours 24 minutes before
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Hazardous weather outlook, Aug 11, 2:20 PM CDT, 4 hours 35 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, 5:59 PM CDT, 56 minutes before
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Special weather statement, Aug 11, 6:02 PM CDT, 53 minutes before
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Special weather statement, Aug 11, 6:06 PM CDT, 49 minutes before
Special Weather Statement
National Weather Service Birmingham AL
606 PM CDT Tue Aug 11 2020

ALZ030-031-112345-
Greene AL-Sumter AL-
606 PM CDT Tue Aug 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL GREENE AND NORTH
CENTRAL SUMTER COUNTIES UNTIL 645 PM CDT...

At 606 PM CDT, Doppler radar was tracking a strong thunderstorm near
Gainesville, or 12 miles west of Eutaw. This storm was nearly
stationary.

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

Locations impacted include...
Boligee, Gainesville, West Greene, New West Greene, Clinton and New
Mount Hebron.

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 3271 8822 3294 8819 3297 8796 3271 8801
TIME...MOT...LOC 2306Z 240DEG 1KT 3284 8810

89^GSatterwhite
Local storm report, Aug 11, 6:12 PM CDT, 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
612 PM CDT TUE AUG 11 2020

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

0545 PM     TSTM WND DMG     1 SSE ROCK CREEK        33.47N 87.08W
08/11/2020                   JEFFERSON          AL   TRAINED SPOTTER

            1 LARGE TREE DOWN WITH 53 MPH GUST REPORTED.
            DIME-SIZE HAIL ALSO OBSERVED.

&&

GMS
Local storm report, Aug 11, 6:20 PM CDT, 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
620 PM CDT TUE AUG 11 2020

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

0414 PM     TSTM WND DMG     1 N STEWARTVILLE        33.10N 86.24W
08/11/2020                   COOSA              AL   EMERGENCY MNGR

            TREES AND POWER LINES WERE BLOWN DOWN AND
            SOME ROADWAYS WERE IMPASSABLE. THE DOWNED
            TREES WERE ON CHATHAM ROAD, SR 68, BICE
            ROAD, AND HIGHWAY 231. ONE TREE HAS FALLEN
            ON A HOME.

&&

MAL
Special weather statement, Aug 11, 6:55 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Birmingham AL
655 PM CDT Tue Aug 11 2020

ALZ023-120030-
Tuscaloosa AL-
655 PM CDT Tue Aug 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN TUSCALOOSA COUNTY
UNTIL 730 PM CDT...

At 655 PM CDT, Doppler radar was tracking a strong thunderstorm near
Jena, or 13 miles southwest of Northport, moving southeast at 10 mph.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Fosters, Ralph and Romulus.

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 3323 8777 3306 8764 3302 8783 3321 8784
TIME...MOT...LOC 2355Z 327DEG 8KT 3312 8778

89^GSatterwhite

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, 3:12 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

Nearby

Special Weather Statements in Alabama, 2020Every special weather statement 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.