Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 240, NWS Mobile, AL

December 25, 2012Covington County, Crenshaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Dec 25, 2012, 10:15 PM CST for Covington County, Crenshaw County, Alabama. It was in force for 60 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 25, 2012, 10:15 PM CST (04:15 UTC)
Expired
Dec 25, 2012, 11:15 PM CST
In force
60 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Covington County, AL, Crenshaw County, AL

The radar

The Eglin Afb radar (KEVX), 89 km from the middle of the area, began a volume at 04:16 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Dec 25, 9:23 PM CSTTornado WatchSPC6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 4.3 hours before the alert went out and 217 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 00:00Z on 2012-12-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 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 00:00Z on 2012-12-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 696 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
22 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
563 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
696 m²/s²
0-3 km storm-relative helicity
921 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

874 
WUUS54 KMOB 260415
SVRMOB
ALC039-041-260515-
/O.NEW.KMOB.SV.W.0240.121226T0415Z-121226T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1015 PM CST TUE DEC 25 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...
  EXTREME SOUTH CENTRAL CRENSHAW COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 1115 PM CST

* AT 1011 PM CST...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF
  PRODUCING DAMAGING WINDS OVER 60 MPH WERE LOCATED ALONG A LINE
  EXTENDING FROM 13 MILES SOUTH OF LUVERNE TO 3 MILES SOUTHEAST OF
  ANDALUSIA TO 18 MILES NORTHWEST OF CRESTVIEW...AND MOVING EAST
  AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HORN HILL...          SANFORD...            RIVER FALLS...
  OPP...                ONYCHA...             LIBERTYVILLE...
  HEATH...              GANTT...              CAROLINA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 AM CST WEDNESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3109 8619 3108 8670 3129 8670 3147 8651
      3148 8619
TIME...MOT...LOC 0415Z 240DEG 58KT 3157 8619 3132 8637
          3102 8667

$$
2 follow-up statements
868 
WWUS54 KMOB 260432
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1032 PM CST TUE DEC 25 2012

ALC039-041-260515-
/O.CON.KMOB.SV.W.0240.000000T0000Z-121226T0515Z/
COVINGTON AL-CRENSHAW AL-
1032 PM CST TUE DEC 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CST
FOR EXTREME SOUTH CENTRAL CRENSHAW AND CENTRAL COVINGTON COUNTIES...

AT 1030 PM CST...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
QUARTER SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WERE LOCATED ALONG A
LINE EXTENDING FROM 9 MILES NORTHWEST OF ELBA TO 7 MILES SOUTHEAST OF
ANDALUSIA TO 14 MILES NORTHWEST OF FLORALA...MOVING EAST TO 
NORTHEAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  HORN HILL...          SANFORD...            OPP...
  ONYCHA...             LIBERTYVILLE...       HEATH...
  CAROLINA...           BABBIE...             ANDALUSIA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 AM CST WEDNESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3109 8619 3108 8670 3123 8658 3147 8638
      3148 8619
TIME...MOT...LOC 0432Z 240DEG 58KT 3149 8617 3127 8635
          3112 8651

$$
656 
WWUS54 KMOB 260501
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1101 PM CST TUE DEC 25 2012

ALC041-260510-
/O.CAN.KMOB.SV.W.0240.000000T0000Z-121226T0515Z/
CRENSHAW AL-
1101 PM CST TUE DEC 25 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR EXTREME
SOUTH CENTRAL CRENSHAW COUNTY...

AT 1058 PM CST...THE LINE OF STORMS THAT PROMPTED THE WARNING FOR 
EXTREME SOUTH CENTRAL CRENSHAW COUNTY HAS MOVED OUT OF THE COUNTY 
...THUS THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 AM CST WEDNESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3109 8619 3111 8645 3123 8643 3146 8627
      3145 8626 3144 8626 3144 8620 3144 8619
TIME...MOT...LOC 0500Z 274DEG 22KT 3134 8616 3120 8623
          3109 8632

$$

ALC039-260515-
/O.CON.KMOB.SV.W.0240.000000T0000Z-121226T0515Z/
COVINGTON AL-
1101 PM CST TUE DEC 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CST
FOR EASTERN COVINGTON COUNTY...

AT 1058 PM CST...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
QUARTER SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WERE LOCATED ALONG A
LINE EXTENDING FROM 6 MILES NORTHEAST OF OPP TO 6 MILES SOUTH OF OPP 
TO 6 MILES NORTH OF FLORALA...MOVING EAST AT 45 TO 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  HORN HILL...          OPP...                ONYCHA...
  BABBIE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 AM CST WEDNESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

&&

LAT...LON 3109 8619 3111 8645 3123 8643 3146 8627
      3145 8626 3144 8626 3144 8620 3144 8619
TIME...MOT...LOC 0500Z 274DEG 22KT 3134 8616 3120 8623
          3109 8632

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 25, 6:08 PM CSTTornado WarningMOBClarke, Monroe, Wilcox67 min
Dec 25, 6:20 PM CSTSpecial Marine WarningMOB85 min
Dec 25, 6:20 PM CSTSevere Thunderstorm WarningMOBClarke, Monroe, Wilcox55 min
Dec 25, 6:29 PM CSTSevere Thunderstorm WarningMOBMobile, Washington46 min
Dec 25, 6:38 PM CSTCoastal Flood AdvisoryMOB5 hr
Dec 25, 6:59 PM CSTTornado WarningMOBClarke, Monroe45 min
Dec 25, 7:00 PM CSTSevere Thunderstorm WarningMOBBaldwin, Clarke, Mobile, Monroe, Washington60 min
Dec 25, 7:00 PM CSTTornado WarningMOBWilcox30 min
Dec 25, 7:19 PM CSTSevere Thunderstorm WarningMOBMobile41 min
Dec 25, 7:21 PM CSTTornado WarningMOBMobile39 min
Dec 25, 7:34 PM CSTTornado WarningMOBWilcox26 min
Dec 25, 7:37 PM CSTSevere Thunderstorm WarningMOBClarke, Conecuh, Monroe, Wilcox53 min
Dec 25, 7:59 PM CSTSevere Thunderstorm WarningMOBBaldwin, Clarke, Conecuh, Escambia, Mobile, Monroe46 min
Dec 25, 8:03 PM CSTSpecial Marine WarningMOB87 min
Dec 25, 8:11 PM CSTTornado WarningMOBBaldwin, Escambia49 min
Dec 25, 8:36 PM CSTTornado WarningMOBButler, Conecuh39 min
Dec 25, 8:44 PM CSTSevere Thunderstorm WarningMOBConecuh, Escambia, Monroe46 min
Dec 25, 8:58 PM CSTSevere Thunderstorm WarningMOBBaldwin47 min
Dec 25, 9:08 PM CSTSpecial Marine WarningMOB82 min
Dec 25, 9:09 PM CSTTornado WarningMOBButler, Crenshaw51 min
Dec 25, 9:23 PM CSTSpecial Marine WarningMOB97 min
Dec 25, 9:29 PM CSTSevere Thunderstorm WarningMOBConecuh, Covington, Escambia46 min
Dec 25, 9:35 PM CSTSevere Thunderstorm WarningMOBButler, Conecuh, Covington, Crenshaw70 min
Dec 25, 9:45 PM CSTSevere Thunderstorm WarningMOBBaldwin, Covington, Escambia45 min
Dec 25, 10:29 PM CSTSevere Thunderstorm WarningMOBCovington, Escambia46 min
Dec 25, 10:33 PM CSTSpecial Marine WarningMOB117 min
Dec 25, 10:40 PM CSTTornado WarningMOBCovington35 min
Dec 25, 11:14 PM CSTSevere Thunderstorm WarningMOBCovington26 min
Dec 26, 5:43 AM CSTWind AdvisoryMOBButler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more9 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2012Every severe thunderstorm warning in 2012

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.