Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS Mobile, AL

February 18, 2012Baldwin County, Mobile County, Alabama; George County, Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Feb 18, 2012, 1:56 PM CST for Baldwin County, Mobile County, Alabama; George County, Mississippi. It was in force for 49 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
Feb 18, 2012, 1:56 PM CST (19:56 UTC)
Expired
Feb 18, 2012, 2:45 PM CST
In force
49 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Baldwin County, AL, Mobile County, AL, George County, MS

The radar

The Mobile radar (KMOB), 21 km from the middle of the area, began a volume at 19:55 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
Feb 18, 11:49 AM CSTTornado WatchSPC5 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.9 hours before the alert went out and 156 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, Slidell Radar S, LA at 12:00Z on 2012-02-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2012-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
449 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
177 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

306 
WUUS54 KMOB 181956
SVRMOB
ALC003-097-MSC039-182045-
/O.NEW.KMOB.SV.W.0013.120218T1956Z-120218T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
156 PM CST SAT FEB 18 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN GEORGE COUNTY IN SOUTHEAST MISSISSIPPI...
  CENTRAL BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  NORTHERN MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 245 PM CST

* AT 155 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 11 MILES SOUTHEAST OF
  LEAKESVILLE TO 9 MILES EAST OF LUCEDALE TO 14 MILES SOUTH OF
  LUCEDALE...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MOVICO...             TANNER WILLIAMS...    SEMMES...
  SATSUMA...            SARALAND...           PRICHARD...
  MOUNT VERNON...       I65 AND US 45...      I65 AND US 43...

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 5 AND 47.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS!

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM CST SATURDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3073 8842 3073 8861 3083 8859 3088 8852
      3100 8850 3100 8842 3111 8843 3116 8762
      3092 8764 3087 8771 3069 8786 3068 8842
TIME...MOT...LOC 1955Z 266DEG 43KT 3103 8839 3088 8839
          3083 8846 3072 8855

$$

JP/MB
1 follow-up statement
345 
WWUS54 KMOB 182028
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
228 PM CST SAT FEB 18 2012

MSC039-182036-
/O.CAN.KMOB.SV.W.0013.000000T0000Z-120218T2045Z/
GEORGE MS-
228 PM CST SAT FEB 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN GEORGE COUNTY IS
CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM CST SATURDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3087 8842 3112 8833 3115 8779 3100 8775
      3087 8782 3068 8796 3068 8842
TIME...MOT...LOC 2026Z 258DEG 30KT 3105 8819 3090 8819
          3085 8826 3074 8835

$$

ALC003-097-182045-
/O.CON.KMOB.SV.W.0013.000000T0000Z-120218T2045Z/
BALDWIN AL-MOBILE AL-
228 PM CST SAT FEB 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CST
FOR NORTHERN MOBILE AND WEST CENTRAL BALDWIN COUNTIES...

AT 228 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM CITRONELLE TO 8 MILES NORTHWEST OF SARALAND TO 15 
MILES WEST OF PRICHARD...MOVING EAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
SEMMES...TANNER WILLIAMS...LOTT...UNIVERSITY OF SOUTH 
ALABAMA...SPRING HILL COLLEGE...CHICKASAW...AND COCHRANE BRIDGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM CST SATURDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3087 8842 3112 8833 3115 8779 3100 8775
      3087 8782 3068 8796 3068 8842
TIME...MOT...LOC 2026Z 258DEG 30KT 3105 8819 3090 8819
          3085 8826 3074 8835

$$

JP/MB

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 18, 3:38 AM CSTWind AdvisoryMOB38 hr
Feb 18, 2:28 PM CSTFlash Flood WarningMOBMobile, Washington32 days
Feb 18, 3:13 PM CSTSevere Thunderstorm WarningMOBBaldwin, Conecuh, Escambia, Monroe47 min
Feb 18, 3:28 PM CSTGale WarningMOB21 hr
Feb 18, 3:37 PM CSTFlash Flood WarningMOBBaldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more113 min
Feb 18, 3:59 PM CSTSevere Thunderstorm WarningMOBBaldwin, Mobile61 min
Feb 18, 4:01 PM CSTSevere Thunderstorm WarningMOBConecuh, Covington, Escambia44 min
Feb 18, 4:07 PM CSTSpecial Marine WarningMOB83 min
Feb 18, 4:19 PM CSTFlash Flood WarningMOBBaldwin, Mobile116 min
Feb 18, 4:21 PM CSTTornado WarningMOBMobile24 min
Feb 18, 4:25 PM CSTAreal Flood AdvisoryMOBChoctaw, Clarke, Monroe, Washington, Wilcox2 hr
Feb 18, 4:30 PM CSTFlash Flood WarningMOBMobile, Washington60 min
Feb 18, 4:38 PM CSTSevere Thunderstorm WarningMOBConecuh, Covington, Crenshaw, Escambia52 min
Feb 18, 4:52 PM CSTFlash Flood WarningMOBBaldwin113 min
Feb 18, 4:59 PM CSTSevere Thunderstorm WarningMOBBaldwin76 min
Feb 18, 5:13 PM CSTFlash Flood WarningMOBBaldwin, Butler, Conecuh, Covington, Crenshaw, Escambia2 hr
Feb 18, 5:17 PM CSTTornado WarningMOBBaldwin28 min
Feb 18, 5:27 PM CSTSpecial Marine WarningMOB93 min
Feb 18, 9:48 AM CSTRiver Flood WarningMOBGeorge, Greene, Perry6 days
Feb 18, 9:48 AM CSTRiver Flood WarningMOBGeorge, Greene, Wayne6 days
Feb 18, 12:39 PM CSTSevere Thunderstorm WarningMOBPerry, Stone51 min
Feb 18, 1:13 PM CSTSevere Thunderstorm WarningMOBGeorge, Stone47 min
Feb 18, 1:17 PM CSTTornado WarningMOBGeorge, Stone13 min
Feb 18, 1:35 PM CSTAreal Flood AdvisoryMOBPerry, Stone115 min
Feb 18, 1:36 PM CSTTornado WarningMOBGeorge, Greene39 min
Feb 18, 4:05 PM CSTAreal Flood WarningMOBGeorge, Greene, Perry, Stone, Wayne34 days

Nearby

Severe Thunderstorm Warnings in Alabama, 2012Severe Thunderstorm Warnings in Mississippi, 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.