Alert archive / Florida / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 252, NWS Tallahassee, FL

July 21, 2016Holmes County, Walton County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 21, 2016, 4:39 PM CDT for Holmes County, Walton County, Florida. It was in force for 17 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: Jul 21, 2016, 4:39 PM CDT (21:39 UTC)
Expired: Jul 21, 2016, 4:56 PM CDT
In force: 17 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Holmes County, FL, Walton County, FL

The radar

The Eglin Afb radar (KEVX), 30 km from the middle of the area, began a volume at 21:39 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 21, 4:43 PM CDT	TSTM WND DMG	Ssw Darlington, FL	TREE DOWN

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, 9.7 hours before the alert went out and 164 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: 1377 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1014 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

091 
WUUS52 KTAE 212139
SVRTAE
FLC059-131-212230-
/O.NEW.KTAE.SV.W.0252.160721T2139Z-160721T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
439 PM CDT THU JUL 21 2016

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN WALTON COUNTY IN FLORIDA...
  WESTERN HOLMES COUNTY IN FLORIDA...

* UNTIL 530 PM CDT

* AT 439 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 12 MILES NORTH OF
  DE FUNIAK SPRINGS...MOVING EAST AT 20 MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  UNION...LIBERTY...PONCE DE LEON...CARYVILLE...WESTVILLE...BLACK...
  ROYALS CROSSROADS...BARKER STORE...BAKER SETTLEMENT...
  HICKORY HILL...PLEASANT HILL...PINEY GROVE...NEW HOPE...
  PROSPERITY...GRITNEY...MILLER CROSSROADS...ARRANT SETTLEMENT...
  BETHLEHEM...GASKIN AND CENTER RIDGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3099 8620 3100 8570 3079 8581 3079 8582
      3078 8582 3078 8583 3074 8583 3070 8585
      3076 8602 3083 8629
TIME...MOT...LOC 2139Z 287DEG 18KT 3090 8607 

HAIL...<.75IN
WIND...60MPH
 
$$

42-DVD

1 follow-up statement

548 
WWUS52 KTAE 212156
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
456 PM CDT THU JUL 21 2016

FLC059-131-212206-
/O.CAN.KTAE.SV.W.0252.000000T0000Z-160721T2230Z/
WALTON FL-HOLMES FL-
456 PM CDT THU JUL 21 2016

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WALTON AND WESTERN
HOLMES COUNTIES IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE...THE WARNING HAS BEEN CANCELLED.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
TALLAHASSEE.

LAT...LON 3099 8620 3100 8570 3079 8581 3079 8582
      3078 8582 3078 8583 3074 8583 3070 8585
      3076 8602 3083 8629
TIME...MOT...LOC 2153Z 287DEG 18KT 3150 8524 

$$

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:59 PM CDT	Severe Thunderstorm Warning	TAE	Madison	31 min
Jul 21, 9:43 AM CDT	Special Marine Warning	TAE		62 min
Jul 21, 1:45 PM CDT	Special Marine Warning	TAE		45 min
Jul 21, 2:48 PM CDT	Special Weather Statement	TAE	Taylor	42 min
Jul 21, 2:57 PM CDT	Severe Thunderstorm Warning	TAE	Wakulla	33 min
Jul 21, 3:15 PM CDT	Severe Thunderstorm Warning	TAE	Liberty, Wakulla	45 min
Jul 21, 4:07 PM CDT	Special Weather Statement	TAE	Liberty	38 min
Jul 21, 4:19 PM CDT	Special Weather Statement	TAE	Gadsden	41 min
Jul 21, 4:30 PM CDT	Special Weather Statement	TAE	Holmes	45 min
Jul 21, 5:11 PM CDT	Special Weather Statement	TAE	Walton	49 min
Jul 21, 5:46 PM CDT	Special Weather Statement	TAE	Jackson	44 min
Jul 21, 6:14 PM CDT	Areal Flood Advisory	TAE	Jackson	2 hr
Jul 21, 6:32 PM CDT	Flash Flood Warning	TAE	Jackson, Washington	3 hr
Jul 21, 6:54 PM CDT	Special Weather Statement	TAE	Dixie	36 min

Nearby

Severe Thunderstorm Warnings in Florida, 2016 Every severe thunderstorm warning in 2016

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.