Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

December 11, 2021Lamar County, Marion County, Alabama

NWS Birmingham, AL issued this special weather statement at Dec 11, 2021, 6:01 AM CST for Lamar County, Marion County, Alabama. It was in force for 59 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 11, 2021, 6:01 AM CST (12:01 UTC)
Expired: Dec 11, 2021, 7:00 AM CST
In force: 59 min
Issued by: NWS Birmingham, AL
Hail: 0.50 in
Wind: 40

Counties Lamar County, AL, Marion County, AL

The radar

The Columbus AFB radar (KGWX), 34 km from the middle of the area, began a volume at 12:00 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, 0.0 hours before the alert went out and 142 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: 245 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 703 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 371 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.8

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 11, 2:33 AM CST, 3 hours 28 minutes earlier.

Area forecast discussion, Dec 11, 2:33 AM CST, 3 hours 28 minutes before

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Hazardous weather outlook, Dec 11, 2:40 AM CST, 3 hours 21 minutes before

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In the hours before

Special weather statement, Dec 11, 6:01 AM 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 11, 7:05 AM CST	Special Weather Statement	BMX	Fayette, Lamar, Marion, Walker, Winston	55 min
Dec 11, 9:31 AM CST	Special Weather Statement	BMX	DeKalb	44 min
Dec 11, 10:17 AM CST	Special Weather Statement	BMX	Calhoun, Cherokee	43 min
Dec 11, 11:03 AM CST	Special Weather Statement	BMX	Cleburne	42 min
Dec 11, 11:10 AM CST	Special Weather Statement	BMX	Bullock	35 min
Dec 11, 11:33 AM CST	Special Weather Statement	BMX	Pike	27 min
Dec 11, 1:56 PM CST	Special Weather Statement	BMX	Bullock	49 min
Dec 11, 2:14 PM CST	Special Weather Statement	BMX	Lee, Russell	46 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.