Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 192, NWS Mobile, AL

August 20, 2021Okaloosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Aug 20, 2021, 2:25 PM CDT for Okaloosa County, Florida. It was in force for 36 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: Aug 20, 2021, 2:25 PM CDT (19:25 UTC)
Expired: Aug 20, 2021, 3:01 PM CDT
In force: 36 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 52 km from the middle of the area, began a volume at 19:27 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, 7.4 hours before the alert went out and 208 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: 675 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1045 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

312 
WUUS54 KMOB 201925
SVRMOB
FLC091-202030-
/O.NEW.KMOB.SV.W.0192.210820T1925Z-210820T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
225 PM CDT Fri Aug 20 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Central Okaloosa County in northwestern Florida...

* Until 330 PM CDT.

* At 224 PM CDT, a severe thunderstorm was located 4 miles west of
  Crestview, moving southeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Crestview, Niceville, Destin, Eglin AFB, Valparaiso, Lake Lorraine
  and Baker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3033 8640 3060 8680 3090 8667 3082 8639
      3046 8639 3047 8634 3039 8637 3040 8639
TIME...MOT...LOC 1924Z 298DEG 21KT 3074 8664 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

1 follow-up statement

556 
WWUS54 KMOB 202001
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
301 PM CDT Fri Aug 20 2021

FLC091-202010-
/O.CAN.KMOB.SV.W.0192.000000T0000Z-210820T2030Z/
Okaloosa FL-
301 PM CDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL OKALOOSA COUNTY IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 3033 8640 3060 8680 3090 8667 3082 8639
      3046 8639 3047 8634 3039 8637 3040 8639
TIME...MOT...LOC 1958Z 298DEG 21KT 3064 8642 

$$

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 20, 12:37 PM CDT	Special Weather Statement	MOB	Escambia	38 min
Aug 20, 1:04 PM CDT	Areal Flood Advisory	MOB	Escambia	3 hr
Aug 20, 1:51 PM CDT	Special Weather Statement	MOB	Okaloosa	39 min
Aug 20, 2:06 PM CDT	Tornado Warning	MOB	Okaloosa	21 min
Aug 20, 2:40 PM CDT	Areal Flood Advisory	MOB	Okaloosa, Santa Rosa	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.