Alert archive / Florida / Tornado Warnings in 2011

Tornado Warning 18, NWS Tallahassee, FL

April 4, 2011Bay County, Walton County, Washington County, Florida

NWS Tallahassee, FL issued this tornado warning at Apr 4, 2011, 11:52 PM CDT for Bay County, Walton County, Washington County, Florida. It was in force for 38 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
Apr 4, 2011, 11:52 PM CDT (04:52 UTC)
Expired
Apr 5, 2011, 12:30 AM CDT
In force
38 min
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon

Counties Bay County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 21 km from the middle of the area, began a volume at 04:52 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
Apr 4, 9:28 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 4.9 hours before the alert went out and 174 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 2011-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1916 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2011-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 189 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
1916 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
521 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
189 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
1.6
Supercell composite
9.6

Open this sounding in Storm Lab

The text

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

060 
WFUS52 KTAE 050452
TORTAE
FLC005-131-133-050530-
/O.NEW.KTAE.TO.W.0018.110405T0452Z-110405T0530Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1152 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN BAY COUNTY IN THE PANHANDLE OF FLORIDA...
  SOUTHERN WALTON COUNTY IN THE PANHANDLE OF FLORIDA...
  SOUTHERN WASHINGTON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 1230 AM CDT

* AT 1148 PM CDT...A DEVELOPING TORNADO HAS BEEN DETECTED BY THE
  NATIONAL WEATHER SERVICE NEAR PORTLAND...OR 15 MILES NORTHEAST OF
  DESTIN...MOVING EAST AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  FREEPORT...ROCK HILL...BRUCE...RED BAY...PINE LOG...EBRO...LIVE
  OAK...MILLERS FERRY...RED HEAD...NEW HOPE...HOLMES VALLEY...CRYSTAL
  LAKE...SMYRNA...SYLVANIA...RIVERSIDE...GREENHEAD...SPRING HOLLOW...
  ECONFINA...GAINER SPRING...SINGER ROAD...PORTER LAKE AND BENNETT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! LEAVE MOBILE HOMES AND VEHICLES FOR SAFER STRUCTURES.
MOVE TO A HALLWAY OR CLOSET ON THE LOWEST FLOOR AWAY FROM WINDOWS AND
OUTSIDE WALLS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A SMALL INTERIOR ROOM.

&&

LAT...LON 3063 8548 3037 8544 3040 8610 3047 8621
      3046 8624 3044 8625 3042 8622 3041 8627
      3046 8624 3048 8627 3046 8630 3043 8630
      3047 8631 3059 8632
TIME...MOT...LOC 0452Z 271DEG 49KT 3051 8620

$$

42-DVD

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 10:59 PM CDTSevere Thunderstorm WarningTAEHolmes, Walton61 min
Apr 4, 11:22 PM CDTSpecial Marine WarningTAE113 min
Apr 4, 11:57 PM CDTSevere Thunderstorm WarningTAEBay, Calhoun, Holmes, Jackson, Walton, Washington48 min
Apr 5, 12:43 AM CDTSevere Thunderstorm WarningTAEBay, Calhoun, Gadsden, Gulf, Jackson, Liberty and 1 more47 min
Apr 5, 1:08 AM CDTSpecial Marine WarningTAE2 hr
Apr 5, 1:28 AM CDTSevere Thunderstorm WarningTAEBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 3 more47 min
Apr 5, 1:45 AM CDTSevere Thunderstorm WarningTAEGadsden, Jefferson, Leon45 min
Apr 5, 1:59 AM CDTSevere Thunderstorm WarningTAEFranklin, Gadsden, Jefferson, Leon, Liberty, Wakulla46 min
Apr 5, 2:01 AM CDTTornado WarningTAEGadsden29 min
Apr 5, 2:09 AM CDTSevere Thunderstorm WarningTAEFranklin, Gulf, Liberty, Wakulla51 min
Apr 5, 2:09 AM CDTTornado WarningTAEGadsden, Leon, Liberty36 min
Apr 5, 2:20 AM CDTSevere Thunderstorm WarningTAEFranklin, Gadsden, Gulf, Jefferson, Leon, Liberty and 3 more55 min
Apr 5, 2:33 AM CDTTornado WarningTAEJefferson, Leon16 min
Apr 5, 3:09 AM CDTSpecial Marine WarningTAE81 min
Apr 5, 3:11 AM CDTSevere Thunderstorm WarningTAEJefferson, Lafayette, Madison, Taylor, Wakulla49 min
Apr 5, 3:33 AM CDTTornado WarningTAEMadison27 min
Apr 5, 3:54 AM CDTSevere Thunderstorm WarningTAEDixie, Lafayette, Taylor66 min
Apr 5, 4:23 AM CDTSpecial Marine WarningTAE52 min
Apr 5, 4:37 AM CDTTornado WarningTAEDixie38 min
Apr 5, 2:40 PM CDTRed Flag WarningTAELeon, Wakulla28 hr

Nearby

Tornado Warnings in Florida, 2011Every tornado warning in 2011Tornadoes 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.