Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 52, NWS Tallahassee, FL

April 4, 20116 counties in Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Apr 4, 2011, 11:57 PM CDT for 6 counties in Florida. It was in force for 48 min. 4 reports 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: Apr 4, 2011, 11:57 PM CDT (04:57 UTC)
Expired: Apr 5, 2011, 12:45 AM CDT
In force: 48 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

Counties Bay County, FL, Calhoun County, FL, Holmes County, FL, Jackson County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 15 km from the middle of the area, began a volume at 04:57 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

Time	Report	Where	Remark
Apr 5, 12:10 AM CDT	TSTM WND GST 60	5 N Bonifay, FL	60 MPH WINDS.NO POWER
Apr 5, 12:30 AM CDT	TSTM WND DMG	Vernon, FL	HWY 79 CLOSED DUE TO DEBRIS. 4 POWER LINES IN ROADS BLOCKING HWY 90 TO THE BEACH.
Apr 5, 12:32 AM CDT	TSTM WND DMG	Chipley, FL	TREES DOWN COUNTYWIDE.
Apr 5, 12:55 AM CDT	TSTM WND DMG	Marianna, FL	TREE DAMAGE AND POWERLINES DOWN ACROSS COUNTY

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.

Issued	Product	Office	Lasted
Apr 4, 9:28 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 5.0 hours before the alert went out and 155 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

119 
WUUS52 KTAE 050457
SVRTAE
FLC005-013-059-063-131-133-050545-
/O.NEW.KTAE.SV.W.0052.110405T0457Z-110405T0545Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1157 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BAY COUNTY IN THE PANHANDLE OF FLORIDA...
  THIS INCLUDES THE CITY OF PANAMA CITY AIRPORT...
  NORTHWESTERN CALHOUN COUNTY IN THE PANHANDLE OF FLORIDA...
  HOLMES COUNTY IN THE PANHANDLE OF FLORIDA...
  JACKSON COUNTY IN THE PANHANDLE OF FLORIDA...
  SOUTHERN WALTON COUNTY IN THE PANHANDLE OF FLORIDA...
  WASHINGTON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 1245 AM CDT

* AT 1152 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETECTED A LINE
  OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 14 MILES NORTH OF BONIFAY TO 12 MILES SOUTHWEST OF SANTA ROSA
  BEACH...OR ALONG A LINE EXTENDING FROM 21 MILES SOUTH OF LOWE ARMY
  HELIPORT TO 9 MILES SOUTHEAST OF DESTIN...AND MOVING EAST AT 55
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  VERNON...CHIPLEY...MARIANNA AND LYNN HAVEN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3043 8632 3041 8629 3043 8624 3039 8613
      3045 8617 3048 8628 3100 8580 3100 8500
      3089 8495 3023 8558 3023 8573 3029 8577
      3026 8578 3028 8580 3028 8583 3023 8585
      3023 8592 3032 8615 3037 8638
TIME...MOT...LOC 0457Z 270DEG 48KT 3098 8569 3030 8633

$$

42-DVD

1 follow-up statement

406 
WWUS52 KTAE 050517
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1217 AM CDT TUE APR 5 2011

FLC005-013-059-063-131-133-050545-
/O.CON.KTAE.SV.W.0052.000000T0000Z-110405T0545Z/
CALHOUN FL-HOLMES FL-WASHINGTON FL-JACKSON FL-WALTON FL-BAY FL-
1217 AM CDT TUE APR 5 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR NORTHERN BAY...SOUTHERN WALTON...JACKSON...WASHINGTON...HOLMES
AND NORTHWESTERN CALHOUN COUNTIES IN THE PANHANDLE OF FLORIDA...

AT 1210 AM CDT...A TRAINED WEATHER SPOTTER ESTIMATED 60 MPH WINDS IN 
BONIFAY. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 
GRACEVILLE TO SEASIDE...OR ALONG A LINE EXTENDING FROM 18 MILES 
SOUTH OF DOTHAN TO 21 MILES WEST OF PANAMA CITY AIRPORT...MOVING 
EAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILLERS
FERRY...JOHNSON CROSSROAD...NEW HOPE...POPLAR HEAD...INLET BEACH...
VERNON...CAMPBELLTON...ELLAVILLE...RED HEAD...RICHTER CROSSROADS...
PINE LOG...EBRO...HOLMES VALLEY...BROCK CROSSROAD...SEMINOLE HILLS...
BAHOMA...CHIPLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3043 8632 3041 8629 3043 8624 3039 8613
      3047 8621 3098 8578 3100 8500 3098 8501
      3089 8495 3023 8558 3023 8573 3029 8577
      3028 8583 3023 8585 3023 8592 3032 8615
      3037 8637
TIME...MOT...LOC 0516Z 269DEG 45KT 3099 8544 3031 8609

$$

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 10:59 PM CDT	Severe Thunderstorm Warning	TAE	Holmes, Walton	61 min
Apr 4, 11:22 PM CDT	Special Marine Warning	TAE		113 min
Apr 4, 11:52 PM CDT	Tornado Warning	TAE	Bay, Walton, Washington	38 min
Apr 5, 12:43 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gadsden, Gulf, Jackson, Liberty and 1 more	47 min
Apr 5, 1:08 AM CDT	Special Marine Warning	TAE		2 hr
Apr 5, 1:28 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 3 more	47 min
Apr 5, 1:45 AM CDT	Severe Thunderstorm Warning	TAE	Gadsden, Jefferson, Leon	45 min
Apr 5, 1:59 AM CDT	Severe Thunderstorm Warning	TAE	Franklin, Gadsden, Jefferson, Leon, Liberty, Wakulla	46 min
Apr 5, 2:01 AM CDT	Tornado Warning	TAE	Gadsden	29 min
Apr 5, 2:09 AM CDT	Severe Thunderstorm Warning	TAE	Franklin, Gulf, Liberty, Wakulla	51 min
Apr 5, 2:09 AM CDT	Tornado Warning	TAE	Gadsden, Leon, Liberty	36 min
Apr 5, 2:20 AM CDT	Severe Thunderstorm Warning	TAE	Franklin, Gadsden, Gulf, Jefferson, Leon, Liberty and 3 more	55 min
Apr 5, 2:33 AM CDT	Tornado Warning	TAE	Jefferson, Leon	16 min
Apr 5, 3:09 AM CDT	Special Marine Warning	TAE		81 min
Apr 5, 3:11 AM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Lafayette, Madison, Taylor, Wakulla	49 min
Apr 5, 3:33 AM CDT	Tornado Warning	TAE	Madison	27 min
Apr 5, 3:54 AM CDT	Severe Thunderstorm Warning	TAE	Dixie, Lafayette, Taylor	66 min
Apr 5, 4:23 AM CDT	Special Marine Warning	TAE		52 min
Apr 5, 4:37 AM CDT	Tornado Warning	TAE	Dixie	38 min
Apr 5, 2:40 PM CDT	Red Flag Warning	TAE	Leon, Wakulla	28 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.