Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 177, NWS Mobile, AL

August 14, 2012Okaloosa County, Santa Rosa County, Florida; Covington County, Escambia County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 14, 2012, 5:04 PM CDT for Okaloosa County, Santa Rosa County, Florida; Covington County, Escambia County, Alabama. It was in force for 56 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
Aug 14, 2012, 5:04 PM CDT (22:04 UTC)
Expired
Aug 14, 2012, 6:00 PM CDT
In force
56 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Covington County, AL, Escambia County, AL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 89 km from the middle of the area, began a volume at 22:04 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, 10.1 hours before the alert went out and 237 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 2012-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1650 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, Birmingham, AL at 12:00Z on 2012-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.193958Sfc1 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
1650 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
658 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
73 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.

430 
WUUS54 KMOB 142204
SVRMOB
ALC039-053-FLC091-113-142300-
/O.NEW.KMOB.SV.W.0177.120814T2204Z-120814T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
504 PM CDT TUE AUG 14 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  NORTHERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  SOUTHERN COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...
  SOUTHEASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 600 PM CDT

* AT 503 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 7 MILES WEST OF ELBA TO 6 MILES SOUTH OF EAST
  BREWTON...AND MOVING EAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HORN HILL...          JAY...                LAUREL HILL...
  SANFORD...            OPP...                ONYCHA...
  LOCKHART...           LIBERTYVILLE...       FLORALA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3099 8622 3099 8638 3089 8638 3078 8656
      3094 8724 3096 8724 3100 8716 3100 8719
      3118 8680 3120 8675 3119 8671 3122 8669
      3144 8619 3101 8619
TIME...MOT...LOC 2203Z 273DEG 21KT 3140 8617 3101 8707

$$
1 follow-up statement
691 
WWUS54 KMOB 142234
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
534 PM CDT TUE AUG 14 2012

ALC039-053-FLC091-113-142300-
/O.CON.KMOB.SV.W.0177.000000T0000Z-120814T2300Z/
COVINGTON AL-ESCAMBIA AL-OKALOOSA FL-SANTA ROSA FL-
534 PM CDT TUE AUG 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHERN SANTA ROSA...NORTHERN OKALOOSA...SOUTHEASTERN ESCAMBIA
AND SOUTHERN COVINGTON COUNTIES...

AT 534 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
WINDS OVER 60 MPH WAS LOCATED 8 MILES SOUTHEAST OF EAST BREWTON...OR
6 MILES SOUTHEAST OF RIVERVIEW...MOVING EAST AT 50 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3099 8622 3099 8638 3089 8638 3078 8656
      3094 8724 3096 8724 3100 8716 3100 8719
      3119 8678 3119 8620 3101 8619
TIME...MOT...LOC 2234Z 267DEG 44KT 3100 8696

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 6:00 PM CDTSevere Thunderstorm WarningMOBOkaloosa, Santa Rosa60 min
Aug 14, 3:04 PM CDTSevere Thunderstorm WarningMOBMobile41 min
Aug 14, 3:16 PM CDTSevere Thunderstorm WarningMOBMobile44 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012Severe 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.