Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 55, NWS Mobile, AL

May 13, 2012Okaloosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at May 13, 2012, 6:40 AM CDT for Okaloosa County, Florida. It was in force for 35 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 13, 2012, 6:40 AM CDT (11:40 UTC)
Expired
May 13, 2012, 7:15 AM CDT
In force
35 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 58 km from the middle of the area, began a volume at 11:43 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 11.7 hours before the alert went out and 213 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, Tallahassee Rgnl, FL at 00:00Z on 2012-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 69 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, Tallahassee Rgnl, FL at 00:00Z on 2012-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 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
69 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
1534 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
101 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.

196 
WUUS54 KMOB 131140
SVRMOB
FLC091-131215-
/O.NEW.KMOB.SV.W.0055.120513T1140Z-120513T1215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
640 AM CDT SUN MAY 13 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...

* UNTIL 715 AM CDT

* AT 638 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 2 MILES NORTH
  OF LAKE LORRAINE...OR 2 MILES NORTH OF SHALIMAR...AND MOVING
  NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SHALIMAR...           OCEAN CITY...         LAKE LORRAINE...
  CINCO BAYOU...        WRIGHT...             VALPARAISO...
  NICEVILLE...          EGLIN AFB...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 60 AND 67.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3040 8657 3041 8655 3042 8655 3043 8658
      3040 8658 3047 8670 3087 8641 3078 8638
      3053 8639 3047 8644 3048 8646 3043 8655
      3040 8653 3042 8649 3038 8653
TIME...MOT...LOC 1140Z 214DEG 17KT 3048 8656

$$
1 follow-up statement
572 
WWUS54 KMOB 131200
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
700 AM CDT SUN MAY 13 2012

FLC091-131215-
/O.CON.KMOB.SV.W.0055.000000T0000Z-120513T1215Z/
OKALOOSA FL-
700 AM CDT SUN MAY 13 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR SOUTHERN OKALOOSA COUNTY...

AT 657 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 2 MILES
NORTHEAST OF LAKE LORRAINE...OR 3 MILES EAST OF SHALIMAR...MOVING
NORTHEAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  SHALIMAR...           OCEAN CITY...         LAKE LORRAINE...
  VALPARAISO...         NICEVILLE...          EGLIN AFB...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3039 8655 3040 8657 3041 8655 3042 8655
      3043 8658 3040 8658 3040 8659 3050 8666
      3071 8640 3063 8639 3053 8639 3047 8644
      3048 8646 3043 8655 3040 8653 3042 8649
TIME...MOT...LOC 1200Z 243DEG 10KT 3046 8652

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 7:44 PM CDTTornado WarningMOBEscambia16 min
May 12, 8:00 PM CDTTornado WarningMOBEscambia30 min
May 12, 9:05 PM CDTAreal Flood AdvisoryMOBEscambia, Santa Rosa115 min
May 13, 7:14 AM CDTTornado WarningMOBOkaloosa33 min

Nearby

Severe 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.