Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

December 10, 2021Elmore County, Alabama

NWS Birmingham, AL issued this special weather statement at Dec 10, 2021, 4:15 PM CST for Elmore County, Alabama. It was in force for 45 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: Dec 10, 2021, 4:15 PM CST (22:15 UTC)
Expired: Dec 10, 2021, 5:00 PM CST
In force: 45 min
Issued by: NWS Birmingham, AL
Hail: 0.00 in
Wind: 40

County Elmore County, AL

The radar

The Maxwell AFB radar (KMXX), 24 km from the middle of the area, began a volume at 22:14 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, 10.3 hours before the alert went out and 104 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: 39 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 463 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 254 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Dec 10, 3:50 PM CST, 25 minutes earlier.

Area forecast discussion, Dec 10, 3:50 PM CST, 25 minutes before

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Hazardous weather outlook, Dec 10, 4:08 PM CST, 7 minutes before

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In the hours before

Special weather statement, Dec 10, 3:21 PM CST, 54 minutes before

Special Weather Statement
National Weather Service Birmingham AL
321 PM CST Fri Dec 10 2021

ALZ044-102145-
Montgomery AL-
321 PM CST Fri Dec 10 2021

...A strong thunderstorm will impact portions of northwestern
Montgomery County through 345 PM CST...

At 321 PM CST, Doppler radar was tracking a strong thunderstorm over
southwestern Montgomery, moving northeast at 25 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Montgomery, Hyundai Motors Of Alabama, Alabama State University,
Auburn University In Montgomery, Hope Hull, Woodcrest, Dannelly
Field, Eastdale Mall, Montgomery Riverwalk Stadium, Pinedale, Lagoon
Park, Gunter Air Force Base, Alabama State Capitol and Barachias.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3225 8637 3231 8641 3244 8624 3231 8611
TIME...MOT...LOC 2121Z 241DEG 21KT 3230 8636

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

32/Davis

Special weather statement, Dec 10, 3:49 PM CST, 26 minutes before

Special Weather Statement
National Weather Service Birmingham AL
349 PM CST Fri Dec 10 2021

ALZ043-044-102215-
Montgomery AL-Elmore AL-
349 PM CST Fri Dec 10 2021

...A strong thunderstorm will impact portions of south central Elmore
and north central Montgomery Counties through 415 PM CST...

At 349 PM CST, Doppler radar was tracking a strong thunderstorm over
northeastern Montgomery, moving northeast at 20 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Eastern Montgomery, Emerald Mountain, Eastdale Mall, Auburn
University In Montgomery, Lagoon Park, Gunter Air Force Base,
Mitylene and Tallapoosa Water Plant.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3234 8624 3239 8628 3250 8613 3241 8603
TIME...MOT...LOC 2149Z 235DEG 19KT 3237 8623

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

32/Davis

Special weather statement, Dec 10, 4:15 PM CST, 0 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
Dec 10, 12:38 PM CST	Wind Advisory	BMX	Bibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 13 more	24 hr
Dec 10, 3:21 PM CST	Special Weather Statement	BMX	Montgomery	24 min
Dec 10, 3:49 PM CST	Special Weather Statement	BMX	Elmore	26 min

Nearby

Special Weather Statements in Alabama, 2021 Every special weather statement in 2021

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.