Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 224, NWS Mobile, AL

December 20, 2012Wilcox County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Dec 20, 2012, 9:49 AM CST for Wilcox County, Alabama. It was in force for 26 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 20, 2012, 9:49 AM CST (15:49 UTC)
Expired: Dec 20, 2012, 10:15 AM CST
In force: 26 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Wilcox County, AL

The radar

The Birmingham radar (KBMX), 133 km from the middle of the area, began a volume at 15:49 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.

Issued	Product	Office	Lasted
Dec 20, 4:23 AM CST	Tornado Watch	SPC	9 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 3.8 hours before the alert went out and 134 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 512 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 574 m²/s²
0-3 km storm-relative helicity: 705 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

151 
WUUS54 KMOB 201549
SVRMOB
ALC131-201615-
/O.NEW.KMOB.SV.W.0224.121220T1549Z-121220T1615Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
949 AM CST THU DEC 20 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN WILCOX COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 1015 AM CST

* AT 946 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED 6 MILES SOUTHWEST OF CAMDEN...OR 7
  MILES NORTH OF VREDENBURGH...AND MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BOYKIN...             OAK HILL...           CAMDEN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. PREPARE FOR DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CST THURSDAY FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3214 8725 3213 8725 3208 8719 3205 8717
      3206 8704 3198 8687 3183 8733 3183 8736
      3198 8746 3215 8728
TIME...MOT...LOC 1550Z 239DEG 54KT 3195 8730

$$

1 follow-up statement

227 
WWUS54 KMOB 201605
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1005 AM CST THU DEC 20 2012

ALC131-201616-
/O.EXP.KMOB.SV.W.0224.000000T0000Z-121220T1615Z/
WILCOX AL-
1005 AM CST THU DEC 20 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE FOR
EASTERN WILCOX COUNTY...

AT 1005 AM CST...THE STORM THAT PROMPTED THE WARNING FOR EASTERN
WILCOX COUNTY HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE
THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE AT 1015 AM CST.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CST THURSDAY FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3214 8725 3213 8725 3208 8719 3205 8717
      3206 8704 3198 8687 3183 8733 3183 8736
      3198 8746 3215 8728
TIME...MOT...LOC 1606Z 239DEG 54KT 3207 8706

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 20, 2:51 AM CST	Gale Warning	MOB		30 hr
Dec 20, 2:51 AM CST	Small Craft Advisory	MOB		33 hr
Dec 20, 4:11 AM CST	Tornado Warning	MOB	Mobile	64 min
Dec 20, 4:42 AM CST	Tornado Warning	MOB	Mobile	36 min
Dec 20, 4:49 AM CST	Tornado Warning	MOB	Choctaw	30 min
Dec 20, 5:14 AM CST	Tornado Warning	MOB	Baldwin	46 min
Dec 20, 5:29 AM CST	Tornado Warning	MOB	Washington	46 min
Dec 20, 5:38 AM CST	Tornado Warning	MOB	Choctaw, Clarke, Washington	52 min
Dec 20, 5:45 AM CST	Tornado Warning	MOB	Baldwin, Mobile	39 min
Dec 20, 6:03 AM CST	Tornado Warning	MOB	Clarke	28 min
Dec 20, 6:06 AM CST	Tornado Warning	MOB	Washington	22 min
Dec 20, 6:08 AM CST	Tornado Warning	MOB	Baldwin	21 min
Dec 20, 6:11 AM CST	Tornado Warning	MOB	Conecuh, Escambia, Monroe	49 min
Dec 20, 6:39 AM CST	Tornado Warning	MOB	Conecuh, Monroe	35 min
Dec 20, 6:40 AM CST	Tornado Warning	MOB	Washington	50 min
Dec 20, 6:56 AM CST	Tornado Warning	MOB	Baldwin, Mobile	34 min
Dec 20, 7:02 AM CST	Tornado Warning	MOB	Baldwin, Mobile	58 min
Dec 20, 7:06 AM CST	Special Marine Warning	MOB		84 min
Dec 20, 7:18 AM CST	Tornado Warning	MOB	Clarke, Washington	42 min
Dec 20, 7:19 AM CST	Tornado Warning	MOB	Conecuh, Escambia, Monroe	56 min
Dec 20, 7:25 AM CST	Tornado Warning	MOB	Clarke, Wilcox	50 min
Dec 20, 7:36 AM CST	Tornado Warning	MOB	Baldwin, Clarke, Monroe	42 min
Dec 20, 7:52 AM CST	Tornado Warning	MOB	Baldwin	53 min
Dec 20, 8:10 AM CST	Tornado Warning	MOB	Wilcox	32 min
Dec 20, 8:14 AM CST	Tornado Warning	MOB	Conecuh, Monroe	33 min
Dec 20, 8:15 AM CST	Severe Thunderstorm Warning	MOB	Choctaw, Clarke	17 min
Dec 20, 8:26 AM CST	Special Marine Warning	MOB		94 min
Dec 20, 8:27 AM CST	Tornado Warning	MOB	Escambia	63 min
Dec 20, 8:29 AM CST	Tornado Warning	MOB	Escambia	46 min
Dec 20, 9:11 AM CST	Tornado Warning	MOB	Escambia	25 min
Dec 20, 9:25 AM CST	Tornado Warning	MOB	Covington	55 min
Dec 20, 9:28 AM CST	Severe Thunderstorm Warning	MOB	Wilcox	15 min
Dec 20, 9:30 AM CST	Special Marine Warning	MOB		60 min
Dec 20, 9:50 AM CST	Tornado Warning	MOB	Covington, Crenshaw	16 min
Dec 20, 10:23 AM CST	Special Marine Warning	MOB		82 min
Dec 20, 11:34 AM CST	Special Marine Warning	MOB		61 min
Dec 20, 2:19 PM CST	Fire Weather Watch	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia, Monroe and 1 more	16 hr
Dec 20, 2:19 PM CST	Red Flag Warning	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more	27 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every 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.