Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 212, NWS Mobile, AL

September 5, 2011Okaloosa County, Santa Rosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Sep 5, 2011, 1:14 PM CDT for Okaloosa County, Santa Rosa County, Florida. It was in force for 39 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
Sep 5, 2011, 1:14 PM CDT (18:14 UTC)
Expired
Sep 5, 2011, 1:53 PM CDT
In force
39 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Okaloosa County, FL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 80 km from the middle of the area, began a volume at 18:14 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
Sep 5, 5:35 AM CDTTornado WatchSPC10 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.2 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, Tallahassee Rgnl, FL at 12:00Z on 2011-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2763 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 12:00Z on 2011-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 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
2763 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
465 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
266 m²/s²
Significant tornado parameter
2.6
Supercell composite
17.8

Open this sounding in Storm Lab

The text

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

941 
WUUS54 KMOB 051814
SVRMOB
FLC091-113-051915-
/O.NEW.KMOB.SV.W.0212.110905T1814Z-110905T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
114 PM CDT MON SEP 5 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 215 PM CDT

* AT 109 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 11 MILES EAST OF BAGDAD...OR 5
  MILES NORTH OF HOLLEY...AND MOVING NORTHEAST AT 75 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HOLLEY...             EAST MILTON...        NAVARRE...
  HAROLD...             LAUREL HILL...        CRESTVIEW...
  BAKER...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 29 AND 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT MONDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3060 8700 3099 8677 3098 8640 3065 8641
      3040 8689
TIME...MOT...LOC 1814Z 205DEG 67KT 3061 8684

$$
1 follow-up statement
649 
WWUS54 KMOB 051853
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
153 PM CDT MON SEP 5 2011

FLC091-113-051901-
/O.CAN.KMOB.SV.W.0212.000000T0000Z-110905T1915Z/
OKALOOSA FL-SANTA ROSA FL-
153 PM CDT MON SEP 5 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SANTA ROSA AND
OKALOOSA COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS.  THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN 
CANCELLED.  

STRONG WINDS ON THE BACKSIDE OF THESE STORMS MAY STILL PERSIST.  BE 
ON ALERT FOR GUSTY WINDS EVEN AFTER THE PERCEIVED THREAT HAS 
DIMINISHED.  

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT MONDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA.

LAT...LON 3060 8700 3099 8677 3098 8640 3065 8641
      3040 8689
TIME...MOT...LOC 1851Z 205DEG 67KT 3123 8650

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 9:12 PM CDTTornado WarningMOBEscambia, Santa Rosa63 min
Sep 4, 9:58 PM CDTHigh Wind WarningMOB21 hr
Sep 4, 9:58 PM CDTWind AdvisoryMOB24 hr
Sep 4, 10:24 PM CDTCoastal Flood AdvisoryMOB15 hr
Sep 4, 10:24 PM CDTRip Current StatementMOB21 hr
Sep 4, 10:24 PM CDTHigh Surf AdvisoryMOB21 hr
Sep 4, 11:53 PM CDTTornado WarningMOBSanta Rosa67 min
Sep 5, 1:07 AM CDTTornado WarningMOBEscambia, Santa Rosa53 min
Sep 5, 2:24 AM CDTRiver Flood WarningMOBEscambia15 hr
Sep 5, 5:11 AM CDTTornado WarningMOBOkaloosa64 min
Sep 5, 7:23 AM CDTAreal Flood WarningMOBEscambia, Okaloosa, Santa Rosa12 hr
Sep 5, 8:40 AM CDTSevere Thunderstorm WarningMOBOkaloosa, Santa Rosa65 min
Sep 5, 9:16 AM CDTTornado WarningMOBOkaloosa44 min
Sep 5, 9:56 AM CDTTornado WarningMOBEscambia34 min
Sep 5, 9:59 AM CDTTornado WarningMOBOkaloosa61 min
Sep 5, 10:35 AM CDTTornado WarningMOBEscambia40 min
Sep 5, 10:39 AM CDTFlash Flood WarningMOBOkaloosa111 min
Sep 5, 10:58 AM CDTTornado WarningMOBOkaloosa62 min
Sep 5, 12:54 PM CDTCoastal Flood WarningMOB6 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2011Every severe thunderstorm warning in 2011

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.