Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Mobile, AL

December 11, 2021Covington County, Alabama

NWS Mobile, AL issued this special weather statement at Dec 11, 2021, 1:21 PM CST for Covington 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 outline as issued.

The facts

Issued
Dec 11, 2021, 1:21 PM CST (19:21 UTC)
Expired
Dec 11, 2021, 2:00 PM CST
In force
39 min
Issued by
NWS Mobile, AL
Hail
0.00 in
Wind
40

County Covington County, AL

The radar

The Eglin Afb radar (KEVX), 102 km from the middle of the area, began a volume at 19:23 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, 7.4 hours before the alert went out and 209 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 2021-12-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 245 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 2021-12-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 325 square meters per square second.1939587897Sfc1 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
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.

451 
WWUS84 KMOB 111921
SPSMOB

Special Weather Statement
National Weather Service Mobile AL
121 PM CST Sat Dec 11 2021
 
ALZ056-059-060-112000-
Conecuh AL-Covington AL-Escambia AL-
121 PM CST Sat Dec 11 2021

...A strong thunderstorm will impact portions of northeastern
Escambia, southeastern Conecuh and northern Covington Counties
through 200 PM CST...

At 121 PM CST, National Weather Service doppler radar indicated a
strong thunderstorm 11 miles southwest of Red Level, or 15 miles west
of Andalusia, moving east at 30 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...
Andalusia, River Falls, Heath and Gantt. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 3125 8635 3116 8685 3126 8685 3135 8687
      3144 8645 3142 8636 3132 8630
TIME...MOT...LOC 1921Z 256DEG 25KT 3128 8675 

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

$$

Black

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 11, 9:55 AM CSTTornado WarningMOBButler, Crenshaw50 min
Dec 11, 11:21 AM CSTSpecial Weather StatementMOBCrenshaw39 min
Dec 11, 12:56 PM CSTSpecial Weather StatementMOBCrenshaw49 min
Dec 11, 2:20 PM CSTSpecial Weather StatementMOBCovington40 min
Dec 11, 10:53 AM CSTSpecial Weather StatementMOBGeorge52 min

Nearby

Special Weather Statements in Alabama, 2021Every 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.