Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 355, NWS Tallahassee, FL

July 31, 2012Holmes County, Walton County, Washington County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 31, 2012, 7:35 AM CDT for Holmes County, Walton County, Washington County, Florida. It was in force for 40 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: Jul 31, 2012, 7:35 AM CDT (12:35 UTC)
Expired: Jul 31, 2012, 8:15 AM CDT
In force: 40 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

Counties Holmes County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 11 km from the middle of the area, began a volume at 12:35 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
Jul 31, 7:40 AM CDT	TSTM WND GST 0	1 N De Funiak Springs, FL	TSTM WIND GUST ESTIMATED AT 60 MPH WITH PEA SIZE HAIL.
Jul 31, 8:00 AM CDT	HAIL 1	Eucheeanna, FL	ALSO REPORTED CONSTANT CLOUD TO GROUND LIGHTNING AND WIND GUST TO 60 MPH. WILL CONDUCT DAMAGE SURVEY AFTER LIGHTNING SUBSIDES.

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

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 0.6 hours before the alert went out and 167 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: 431 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1025 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

970 
WUUS52 KTAE 311235
SVRTAE
FLC059-131-133-311315-
/O.NEW.KTAE.SV.W.0355.120731T1235Z-120731T1315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
735 AM CDT TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

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

* UNTIL 815 AM CDT

* AT 730 AM 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 6
  MILES WEST OF DE FUNIAK SPRINGS TO 6 MILES NORTH OF                
  VERNON...MOVING SOUTH AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO      
  DE FUNIAK SPRINGS...PLEASANT RIDGE...WAUSAU...RED BAY...LIVE       
  OAK...HOLMES VALLEY...NEW HOPE...FREEPORT...BRUCE...EBRO AND       
  CRYSTAL LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY. PEOPLE OUTSIDE SHOULD MOVE INSIDE A STRONG BUILDING BUT
AWAY FROM WINDOWS.

CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3078 8561 3044 8550 3043 8617 3045 8617
      3047 8623 3043 8625 3046 8624 3048 8627
      3079 8634
TIME...MOT...LOC 1234Z 347DEG 21KT 3070 8621 3069 8569

$$

38-GODSEY

1 follow-up statement

495 
WWUS52 KTAE 311254
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
754 AM CDT TUE JUL 31 2012

FLC059-131-133-311315-
/O.CON.KTAE.SV.W.0355.000000T0000Z-120731T1315Z/
HOLMES FL-WASHINGTON FL-WALTON FL-
754 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CDT 
FOR CENTRAL WALTON...WASHINGTON AND SOUTHERN HOLMES COUNTIES IN THE 
PANHANDLE OF FLORIDA...

AT 748 AM CDT...TRAINED WEATHER SPOTTERS REPORTED AND 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 NEW HOME 
TO SPRING HOLLOW...MOVING SOUTH AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
GREENHEAD...PORTER LAKE...RIVERSIDE...RED HEAD...PORTLAND...
FREEPORT...BRUCE...CRYSTAL LAKE AND EBRO

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. STORM SPOTTERS HAVE ALREADY REPORTED 
WINDS IN EXCESS OF 60 MPH WITH THIS LINE OF STORMS. IF YOU ARE IN 
ITS PATH...PREPARE IMMEDIATELY. PEOPLE OUTSIDE SHOULD MOVE TO A 
SHELTER...PREFERABLY INSIDE A STRONG BUILDING AWAY FROM WINDOWS.

IN ADDITION TO DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING 
IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! LIGHTNING IS 
ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR 
THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3078 8561 3044 8550 3043 8617 3045 8617
      3047 8623 3043 8625 3046 8624 3048 8627
      3079 8634
TIME...MOT...LOC 1253Z 347DEG 24KT 3058 8622 3053 8565

$$

38-GODSEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 7:16 PM CDT	Severe Thunderstorm Warning	TAE	Holmes, Jackson	44 min
Jul 31, 5:09 AM CDT	Special Marine Warning	TAE		66 min
Jul 31, 7:01 AM CDT	Special Weather Statement	TAE	Holmes	59 min
Jul 31, 8:10 AM CDT	Special Weather Statement	TAE	Bay	65 min
Jul 31, 8:25 AM CDT	Special Marine Warning	TAE		2 hr
Jul 31, 8:28 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Walton, Washington	47 min
Jul 31, 10:24 AM CDT	Special Marine Warning	TAE		2 hr
Jul 31, 10:29 AM CDT	Special Marine Warning	TAE		91 min
Jul 31, 10:34 AM CDT	Special Marine Warning	TAE		56 min
Jul 31, 11:24 AM CDT	Special Marine Warning	TAE		51 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 Every severe thunderstorm warning in 2012

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.