Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 159, NWS Mobile, AL

July 30, 2012Okaloosa County, Santa Rosa County, Florida; Escambia County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jul 30, 2012, 8:21 PM CDT for Okaloosa County, Santa Rosa County, Florida; Escambia County, Alabama. It was in force for 25 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
Jul 30, 2012, 8:21 PM CDT (01:21 UTC)
Expired
Jul 30, 2012, 8:46 PM CDT
In force
25 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

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

The radar

The Eglin Afb radar (KEVX), 95 km from the middle of the area, began a volume at 01:21 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, 1.4 hours before the alert went out and 250 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 2012-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2222 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 2012-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
2222 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
1177 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.5
Supercell composite
5.2

Open this sounding in Storm Lab

The text

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

463 
WUUS54 KMOB 310121
SVRMOB
ALC053-FLC091-113-310215-
/O.NEW.KMOB.SV.W.0159.120731T0121Z-120731T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
821 PM CDT MON JUL 30 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  NORTHEASTERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  SOUTHEASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 915 PM CDT

* AT 819 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER
  SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WAS LOCATED 16 MILES EAST
  OF EAST BREWTON...OR 4 MILES SOUTH OF US 29 AND CR 43...AND MOVING
  SOUTH AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WHITING FIELD...      US 29 AND CR 43...

THIS INCLUDES INTERSTATE 10 IN FLORIDA BETWEEN MILE MARKERS 38 AND
42.

LAT...LON 3063 8680 3072 8709 3120 8686 3116 8671
TIME...MOT...LOC 0121Z 016DEG 22KT 3109 8680

$$
1 follow-up statement
245 
WWUS54 KMOB 310146
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
846 PM CDT MON JUL 30 2012

ALC053-FLC091-113-310156-
/O.CAN.KMOB.SV.W.0159.000000T0000Z-120731T0215Z/
ESCAMBIA AL-OKALOOSA FL-SANTA ROSA FL-
846 PM CDT MON JUL 30 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR
NORTHEASTERN SANTA ROSA...NORTHWESTERN OKALOOSA AND SOUTHEASTERN
ESCAMBIA COUNTIES...

AT 843 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR NORTHEASTERN
SANTA ROSA...NORTHWESTERN OKALOOSA AND SOUTHEASTERN ESCAMBIA COUNTIES
HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE THUNDERSTORM
WARNING HAS BEEN CANCELLED.

LAT...LON 3063 8680 3072 8709 3120 8686 3116 8671
TIME...MOT...LOC 0146Z 016DEG 22KT 3094 8685

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 7:40 PM CDTSevere Thunderstorm WarningMOBCovington51 min
Jul 31, 4:33 AM CDTSevere Thunderstorm WarningMOBButler, Crenshaw87 min
Jul 31, 7:24 AM CDTSevere Thunderstorm WarningMOBButler, Wilcox66 min
Jul 31, 7:54 AM CDTSevere Thunderstorm WarningMOBButler, Crenshaw23 min
Jul 31, 8:15 AM CDTSpecial Marine WarningMOB60 min
Jul 31, 8:54 AM CDTAreal Flood AdvisoryMOBWilcox2 hr
Jul 31, 9:14 AM CDTSpecial Marine WarningMOB91 min
Jul 31, 9:32 AM CDTFlash Flood WarningMOBWilcox4 hr
Jul 31, 10:47 AM CDTSpecial Marine WarningMOB58 min
Jul 31, 11:52 AM CDTSpecial Marine WarningMOB83 min
Jul 31, 2:41 PM CDTSpecial Marine WarningMOB94 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.