Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 49, NWS Tallahassee, FL

April 4, 2011Holmes County, Walton County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Apr 4, 2011, 10:59 PM CDT for Holmes County, Walton County, Florida. It was in force for 61 min. 2 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, 10:59 PM CDT (03:59 UTC)
Expired: Apr 5, 2011, 12:00 AM CDT
In force: 61 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

Counties Holmes County, FL, Walton County, FL

The radar

The Eglin Afb radar (KEVX), 16 km from the middle of the area, began a volume at 03:58 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 4, 11:45 PM CDT	TSTM WND DMG	De Funiak Springs, FL	TREES DOWN COUNTYWIDE.
Apr 5, 12:10 AM CDT	TSTM WND GST 60	5 N Bonifay, FL	60 MPH WINDS.NO POWER

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, 4.0 hours before the alert went out and 173 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.

053 
WUUS52 KTAE 050359
SVRTAE
FLC059-131-050500-
/O.NEW.KTAE.SV.W.0049.110405T0359Z-110405T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1059 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HOLMES COUNTY IN THE PANHANDLE OF FLORIDA...
  WALTON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL MIDNIGHT CDT

* AT 1053 PM CDT...THE NATIONAL WEATHER SERVICE HAS DETECTED A LINE
  OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 35 MILES NORTHWEST OF DE FUNIAK SPRINGS
  TO 63 MILES WEST OF SANTA ROSA BEACH...MOVING EAST AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CLEAR
  SPRINGS...FLOWERSVILLE...PAXTON...LAKEWOOD...NATURAL BRIDGE...POND
  CREEK...GORDON...NEW HARMONY...FOX HILL...CANEY CREEK...GASKIN...  
  MOSSY HEAD...CLUSTER SPRINGS.

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 3100 8639 3099 8558 3076 8573 3079 8575
      3079 8582 3073 8582 3064 8591 3049 8586
      3044 8591 3042 8599 3029 8605 3038 8640
      3040 8639 3040 8634 3043 8632 3041 8629
      3043 8624 3039 8613 3047 8621 3047 8640
TIME...MOT...LOC 0358Z 270DEG 50KT 3116 8634 3026 8719

$$

42-DVD

1 follow-up statement

719 
WWUS52 KTAE 050437
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1137 PM CDT MON APR 4 2011

FLC059-131-050500-
/O.CON.KTAE.SV.W.0049.000000T0000Z-110405T0500Z/
HOLMES FL-WALTON FL-
1137 PM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR WALTON AND HOLMES COUNTIES...

AT 1135 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 11 MILES NORTH OF SMITH CROSSROADS TO 21 MILES 
SOUTHWEST OF MIRAMAR BEACH...MOVING EAST AT 55 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SWEETGUM HEAD...PINEY GROVE...LEONIA...CENTER RIDGE...PLEASANT 
HILL...DE FUNIAK SPRING AIRPORT.

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 3100 8639 3099 8558 3076 8573 3079 8575
      3079 8582 3073 8582 3064 8591 3049 8586
      3044 8591 3042 8599 3029 8605 3038 8640
      3040 8639 3040 8634 3043 8632 3041 8629
      3043 8624 3039 8613 3047 8621 3047 8640
TIME...MOT...LOC 0436Z 270DEG 50KT 3113 8580 3024 8666

$$

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
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 4, 11:57 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Holmes, Jackson, Walton, Washington	48 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.