Alert archive / Florida / Tornado Warnings in 2011

Tornado Warning 39, NWS Tallahassee, FL

September 4, 2011Bay County, Washington County, Florida

NWS Tallahassee, FL issued this tornado warning at Sep 4, 2011, 10:20 AM CDT for Bay County, Washington County, Florida. It was in force for 40 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 4, 2011, 10:20 AM CDT (15:20 UTC)
Expired
Sep 4, 2011, 11:00 AM CDT
In force
40 min
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon

Counties Bay County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 22 km from the middle of the area, began a volume at 15:21 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.

What was reported inside it

TimeReportWhereRemark
Sep 4, 10:35 AM CDTTORNADOCrystal Lake, FLPUBLIC REPORTED A TORNADO NEAR HWY 20 IN CRYSTAL LAKE. TORNADO DISSIPATED AS IT CROSSED THE HIGHWAY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 4, 5:05 AM CDTTornado WatchSPC11 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.3 hours before the alert went out and 135 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 2011-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1223 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 2011-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 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
1223 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
468 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.3

Open this sounding in Storm Lab

The text

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

265 
WFUS52 KTAE 041520
TORTAE
FLC005-133-041600-
/O.NEW.KTAE.TO.W.0039.110904T1520Z-110904T1600Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1020 AM CDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL BAY COUNTY IN THE PANHANDLE OF FLORIDA...
  CENTRAL WASHINGTON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 1100 AM CDT

* AT 1016 AM CDT...A DEVELOPING TORNADO HAS BEEN DETECTED BY THE
  NATIONAL WEATHER SERVICE NEAR CRYSTAL LAKE...OR NEAR VICKSBURG...
  MOVING NORTH AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CRYSTAL LAKE...RIVERSIDE...GREENHEAD...HOLMES VALLEY...SPRING
  HOLLOW AND SMYRNA

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.

&&

LAT...LON 3062 8582 3062 8554 3035 8560 3034 8572
TIME...MOT...LOC 1520Z 177DEG 21KT 3039 8566

$$

14-MROCZKA
1 follow-up statement
240 
WWUS52 KTAE 041536
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1136 AM EDT SUN SEP 4 2011

FLC005-041545-
/O.CAN.KTAE.TO.W.0039.000000T0000Z-110904T1600Z/
BAY FL-
1036 AM CDT SUN SEP 4 2011

...THE TORNADO WARNING FOR NORTH CENTRAL BAY COUNTY IS CANCELLED...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES THE THE CIRCULATION 
THAT PROMPTED THE WARNING HAS MOVED NORTH OF THE COUNTY. THEREFORE
THE TORNADO WARNING FOR NORTH CENTRAL BAY COUNTY HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY AFTERNOON
FOR SOUTHEAST ALABAMA AND CENTRAL FLORIDA.

LAT...LON 3062 8554 3044 8558 3044 8576 3062 8582
TIME...MOT...LOC 1535Z 177DEG 21KT 3048 8567

$$

FLC133-041600-
/O.CON.KTAE.TO.W.0039.000000T0000Z-110904T1600Z/
WASHINGTON FL-
1036 AM CDT SUN SEP 4 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT FOR CENTRAL
WASHINGTON COUNTY...

AT 1030 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A POSSIBLE TORNADO.  THIS TORNADO WAS LOCATED NEAR CRYSTAL 
LAKE...MOVING NORTH AT 25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
GREENHEAD...HOLMES VALLEY...SPRING HOLLOW...SMYRNA AND SYLVANIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY AFTERNOON
FOR SOUTHEAST ALABAMA AND CENTRAL FLORIDA.

&&

LAT...LON 3062 8554 3044 8558 3044 8576 3062 8582
TIME...MOT...LOC 1535Z 177DEG 21KT 3048 8567

$$

14-MROCZKA

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 9:47 PM CDTSpecial Marine WarningTAE58 min
Sep 4, 3:13 AM CDTFlash Flood WatchTAEBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 5 more35 hr
Sep 4, 5:11 AM CDTSevere Thunderstorm WarningTAEWalton49 min
Sep 4, 5:45 AM CDTSpecial Weather StatementTAEWashington30 min
Sep 4, 8:13 AM CDTSpecial Marine WarningTAE32 min
Sep 4, 8:40 AM CDTSpecial Marine WarningTAE50 min
Sep 4, 9:59 AM CDTTornado WarningTAEWalton31 min
Sep 4, 11:40 AM CDTTornado WarningTAEWashington25 min
Sep 4, 1:37 PM CDTSpecial Marine WarningTAE38 min
Sep 4, 2:07 PM CDTSpecial Weather StatementTAEWakulla23 min
Sep 4, 2:13 PM CDTSpecial Marine WarningTAE47 min
Sep 4, 2:27 PM CDTSpecial Weather StatementTAEFranklin48 min
Sep 4, 2:32 PM CDTCoastal Flood WatchTAEBay, Dixie, Franklin, Gulf, Jefferson, Taylor and 2 more25 hr
Sep 4, 2:36 PM CDTSpecial Weather StatementTAEGadsden, Leon, Wakulla39 min
Sep 4, 2:43 PM CDTSpecial Marine WarningTAE47 min
Sep 4, 3:12 PM CDTSpecial Weather StatementTAEJefferson48 min
Sep 4, 3:49 PM CDTSpecial Marine WarningTAE41 min
Sep 4, 4:03 PM CDTTornado WarningTAETaylor27 min
Sep 4, 4:29 PM CDTSpecial Marine WarningTAE61 min
Sep 4, 4:46 PM CDTSpecial Marine WarningTAE44 min
Sep 4, 4:58 PM CDTSpecial Marine WarningTAE47 min
Sep 4, 6:01 PM CDTSpecial Marine WarningTAE44 min
Sep 4, 6:44 PM CDTSpecial Marine WarningTAE61 min
Sep 4, 6:48 PM CDTSpecial Marine WarningTAE27 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.