Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 62, NWS Mobile, AL

May 21, 2012Baldwin County, Escambia County, Mobile County, Alabama; Escambia County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at May 21, 2012, 4:54 PM CDT for Baldwin County, Escambia County, Mobile County, Alabama; Escambia County, Florida. It was in force for 51 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
May 21, 2012, 4:54 PM CDT (21:54 UTC)
Expired
May 21, 2012, 5:45 PM CDT
In force
51 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Baldwin County, AL, Escambia County, AL, Mobile County, AL, Escambia County, FL

The radar

The Mobile radar (KMOB), 62 km from the middle of the area, began a volume at 21:56 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.9 hours before the alert went out and 204 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 2012-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 620 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 2012-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.1939Sfc1 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
620 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
1402 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
39 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.

980 
WUUS54 KMOB 212154
SVRMOB
ALC003-053-097-FLC033-212245-
/O.NEW.KMOB.SV.W.0062.120521T2154Z-120521T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
454 PM CDT MON MAY 21 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN ESCAMBIA COUNTY IN NORTHWEST FLORIDA...
  SOUTHWESTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...
  NORTHWESTERN BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  NORTHEASTERN MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 545 PM CDT

* AT 454 PM CDT...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  QUARTER SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WERE LOCATED ALONG
  A LINE EXTENDING FROM 13 MILES NORTH OF CREOLA...TO 8 MILES 
  NORTHEAST OF STOCKTON...MOVING SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MOVICO...             POARCH CREEK RESERVATION...
  MOUNT VERNON...       BUCKS...              STOCKTON...
  PERDIDO...            I65 AND CR 47...      I65 AND AL 59...
  I65 AND AL 287...

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 24 AND 58.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PERSONS IN THE WARNED AREA SHOULD PREPARE FOR DESTRUCTIVE HAIL AND 
DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE INSIDE A STRONG BUILDING 
BUT AWAY FROM WINDOWS.

&&

LAT...LON 3110 8809 3116 8789 3115 8787 3116 8788
      3123 8757 3123 8754 3092 8736 3074 8791
TIME...MOT...LOC 2151Z 306DEG 17KT 3106 8795 3104 8788
          3111 8769

$$
1 follow-up statement
487 
WWUS54 KMOB 212226
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
526 PM CDT MON MAY 21 2012

ALC003-053-097-FLC033-212245-
/O.CON.KMOB.SV.W.0062.000000T0000Z-120521T2245Z/
ESCAMBIA AL-ESCAMBIA FL-BALDWIN AL-MOBILE AL-
526 PM CDT MON MAY 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR NORTHEASTERN MOBILE...NORTHWESTERN BALDWIN...NORTHWESTERN
ESCAMBIA AND SOUTHWESTERN ESCAMBIA COUNTIES...

AT 523 PM CDT...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING 
QUARTER TO GOLFBALL SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WERE 
LOCATED ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF CREOLA TO 
12 MILES NORTH OF BAY MINETTE...MOVING SOUTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  I65 AND AL225...     I65 AND AL 59...  I65 AND AL 287...

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 24 AND 58.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

LAT...LON 3110 8809 3116 8789 3115 8787 3116 8788
      3123 8757 3123 8754 3092 8736 3074 8791
TIME...MOT...LOC 2224Z 306DEG 17KT 3097 8797 3095 8773
          3102 8754

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 2:03 PM CDTSpecial Marine WarningMOB87 min
May 21, 2:54 PM CDTSevere Thunderstorm WarningMOBMonroe, Wilcox51 min
May 21, 3:04 PM CDTSevere Thunderstorm WarningMOBMobile19 min
May 21, 3:08 PM CDTSevere Thunderstorm WarningMOBButler, Conecuh, Monroe52 min
May 21, 3:11 PM CDTSpecial Marine WarningMOB59 min
May 21, 3:36 PM CDTSevere Thunderstorm WarningMOBButler, Clarke, Conecuh, Covington, Crenshaw, Monroe and 1 more54 min
May 21, 4:26 PM CDTSevere Thunderstorm WarningMOBConecuh, Escambia64 min
May 21, 4:32 PM CDTSpecial Marine WarningMOB88 min
May 21, 5:48 PM CDTSevere Thunderstorm WarningMOBBaldwin, Escambia, Mobile57 min
May 21, 6:56 PM CDTSevere Thunderstorm WarningMOBBaldwin64 min
May 21, 5:22 PM CDTSevere Thunderstorm WarningMOBEscambia, Santa Rosa53 min

Nearby

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