Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 191, NWS Tallahassee, FL

July 15, 2021Walton County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 15, 2021, 3:54 PM CDT for Walton County, Florida. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 15, 2021, 3:54 PM CDT (20:54 UTC)
Expired: Jul 15, 2021, 4:45 PM CDT
In force: 51 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 22 km from the middle of the area, began a volume at 21:10 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.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.9 hours before the alert went out and 176 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: 977 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 911 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

558 
WUUS52 KTAE 152054 RRA
SVRTAE
FLC131-152145-
/O.NEW.KTAE.SV.W.0191.210715T2054Z-210715T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
354 PM CDT Thu Jul 15 2021

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  Central Walton County in the Panhandle of Florida...

* Until 445 PM CDT.

* At 354 PM CDT, a severe thunderstorm was located 12 miles southeast
  of Eglin Air Force Base, or 13 miles northeast of Santa Rosa Beach,
  and is nearly stationary.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Eglin Air Force Base, Freeport, Eucheeanna, Knox Hill, Red Bay and
  Rock Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3070 8617 3065 8591 3038 8602 3040 8612
      3042 8612 3042 8614 3043 8612 3043 8615
      3044 8616 3045 8616 3047 8613 3047 8614
      3046 8616 3046 8619 3047 8619
TIME...MOT...LOC 2054Z 193DEG 2KT 3051 8609 

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

11-MM

1 follow-up statement

557 
WWUS52 KTAE 152141
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
441 PM CDT Thu Jul 15 2021

FLC131-152151-
/O.EXP.KTAE.SV.W.0191.000000T0000Z-210715T2145Z/
Walton FL-
441 PM CDT Thu Jul 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WALTON COUNTY WILL
EXPIRE AT 445 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

LAT...LON 3070 8617 3065 8591 3038 8602 3040 8612
      3042 8612 3042 8614 3043 8612 3043 8615
      3044 8616 3045 8616 3047 8613 3047 8614
      3046 8616 3046 8619 3047 8619
TIME...MOT...LOC 2141Z 193DEG 2KT 3053 8608 

$$

11-MM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 7:08 PM CDT	Special Weather Statement	TAE	Taylor	37 min
Jul 14, 8:12 PM CDT	Special Marine Warning	TAE		63 min
Jul 14, 8:54 PM CDT	Special Marine Warning	TAE		2 hr
Jul 15, 1:01 PM CDT	Special Marine Warning	TAE		63 min
Jul 15, 1:49 PM CDT	Special Weather Statement	TAE	Gulf	26 min
Jul 15, 2:27 PM CDT	Special Marine Warning	TAE		93 min
Jul 15, 2:28 PM CDT	Special Weather Statement	TAE	Bay	47 min
Jul 15, 2:34 PM CDT	Areal Flood Advisory	TAE	Bay	2 hr
Jul 15, 3:20 PM CDT	Special Weather Statement	TAE	Bay, Washington	55 min
Jul 15, 3:24 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Walton, Washington	51 min
Jul 15, 3:43 PM CDT	Special Weather Statement	TAE	Holmes	47 min
Jul 15, 3:45 PM CDT	Special Weather Statement	TAE	Walton	60 min
Jul 15, 3:54 PM CDT	Severe Thunderstorm Warning	TAE	Walton	51 min
Jul 15, 3:58 PM CDT	Special Marine Warning	TAE		62 min
Jul 15, 4:24 PM CDT	Severe Thunderstorm Warning	TAE	Walton	23 min
Jul 15, 4:51 PM CDT	Special Weather Statement	TAE	Holmes	54 min
Jul 15, 5:19 PM CDT	Areal Flood Advisory	TAE	Holmes, Walton	3 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.