Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 128, NWS Tallahassee, FL

May 11, 20214 counties in Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at May 11, 2021, 4:46 PM CDT for 4 counties in Florida. It was in force for 61 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: May 11, 2021, 4:46 PM CDT (21:46 UTC)
Expired: May 11, 2021, 5:47 PM CDT
In force: 61 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bay County, FL, Calhoun County, FL, Jackson County, FL, Washington County, FL

The radar

The Tallahassee radar (KTLH), 75 km from the middle of the area, began a volume at 21:48 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
May 11, 5:26 PM CDT	TSTM WND DMG	1 Ene Chason, FL	POWER LINE REPORTED DOWN NEAR 11548 NW COUNTY ROAD 274.

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, 9.8 hours before the alert went out and 78 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: 799 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 866 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

645 
WUUS52 KTAE 112146
SVRTAE
FLC005-013-063-133-112300-
/O.NEW.KTAE.SV.W.0128.210511T2146Z-210511T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
446 PM CDT Tue May 11 2021

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  Southern Jackson County in the Panhandle of Florida...
  Northeastern Bay County in the Panhandle of Florida...
  Calhoun County in the Panhandle of Florida...
  Southeastern Washington County in the Panhandle of Florida...

* Until 600 PM CDT.

* At 446 PM CDT, a severe thunderstorm was located 13 miles southeast
  of Vernon, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Blountstown, Altha, Wausau, Moose Pond, Clarksville, Ocheesee,
  Selman, Abe Springs, Fountain, Singer Road, Union City, Chipola,
  Henderson Mill, Camps Head, Gainer Spring, Kennys Mill, Bennett,
  Porter Lake, Alliance and Blountstown Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Tallahassee.

&&

LAT...LON 3064 8563 3070 8524 3065 8492 3061 8493
      3058 8495 3058 8496 3056 8496 3052 8499
      3045 8499 3044 8498 3042 8503 3041 8501
      3040 8503 3039 8501 3037 8504 3036 8503
      3034 8505 3031 8504 3040 8566
TIME...MOT...LOC 2146Z 270DEG 26KT 3051 8553 

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

42-DVD

3 follow-up statements

613 
WWUS52 KTAE 112204
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
504 PM CDT Tue May 11 2021

FLC133-112214-
/O.CAN.KTAE.SV.W.0128.000000T0000Z-210511T2300Z/
Washington FL-
504 PM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3067 8542 3070 8524 3065 8492 3061 8493
      3058 8495 3058 8496 3056 8496 3052 8499
      3045 8499 3044 8498 3042 8503 3041 8501
      3040 8503 3039 8501 3037 8504 3036 8503
      3034 8505 3031 8504 3037 8545
TIME...MOT...LOC 2204Z 270DEG 26KT 3051 8537 

$$

FLC005-013-063-112300-
/O.CON.KTAE.SV.W.0128.000000T0000Z-210511T2300Z/
Jackson FL-Bay FL-Calhoun FL-
504 PM CDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR SOUTHEASTERN JACKSON...NORTHEASTERN BAY AND CALHOUN COUNTIES IN
THE PANHANDLE OF FLORIDA...

At 504 PM CDT, a severe thunderstorm was located 19 miles west of
Blountstown, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Blountstown, Altha, Moose Pond, Clarksville, Ocheesee, Selman, Abe
Springs, Fountain, Union City, Chipola, Henderson Mill, Camps Head,
Kennys Mill, Alliance, Blountstown Airport, Hugh Creek, Compass Lake,
Betts, Red Oak and Ridgetop.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Tallahassee.

&&

LAT...LON 3067 8542 3070 8524 3065 8492 3061 8493
      3058 8495 3058 8496 3056 8496 3052 8499
      3045 8499 3044 8498 3042 8503 3041 8501
      3040 8503 3039 8501 3037 8504 3036 8503
      3034 8505 3031 8504 3037 8545
TIME...MOT...LOC 2204Z 270DEG 26KT 3051 8537 

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

42-DVD

494 
WWUS52 KTAE 112218
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
518 PM CDT Tue May 11 2021

FLC005-112228-
/O.CAN.KTAE.SV.W.0128.000000T0000Z-210511T2300Z/
Bay FL-
518 PM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BAY COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3070 8524 3065 8492 3061 8493 3058 8495
      3058 8496 3056 8496 3052 8499 3045 8499
      3044 8498 3042 8503 3041 8501 3040 8503
      3039 8501 3037 8504 3036 8503 3034 8505
      3031 8504 3035 8534 3069 8532
TIME...MOT...LOC 2218Z 270DEG 26KT 3051 8525 

$$

FLC013-063-112300-
/O.CON.KTAE.SV.W.0128.000000T0000Z-210511T2300Z/
Jackson FL-Calhoun FL-
518 PM CDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR SOUTHEASTERN JACKSON AND CALHOUN COUNTIES IN THE PANHANDLE OF
FLORIDA...

At 518 PM CDT, a severe thunderstorm was located 12 miles northwest
of Blountstown, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Blountstown, Altha, Moose Pond, Clarksville, Ocheesee, Selman, Abe
Springs, Union City, Chipola, Henderson Mill, Camps Head, Kennys
Mill, Alliance, Blountstown Airport, Hugh Creek, Red Oak, Sharpstown,
Chason, Sink Creek and Willis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Tallahassee.

&&

LAT...LON 3070 8524 3065 8492 3061 8493 3058 8495
      3058 8496 3056 8496 3052 8499 3045 8499
      3044 8498 3042 8503 3041 8501 3040 8503
      3039 8501 3037 8504 3036 8503 3034 8505
      3031 8504 3035 8534 3069 8532
TIME...MOT...LOC 2218Z 270DEG 26KT 3051 8525 

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

42-DVD

527 
WWUS52 KTAE 112247
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
547 PM CDT Tue May 11 2021

FLC013-063-112257-
/O.CAN.KTAE.SV.W.0128.000000T0000Z-210511T2300Z/
Jackson FL-Calhoun FL-
547 PM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JACKSON AND
CALHOUN COUNTIES IN THE PANHANDLE OF FLORIDA IS CANCELLED...
                
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 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 3070 8524 3065 8492 3061 8493 3058 8495
      3058 8496 3056 8496 3052 8499 3045 8499
      3044 8498 3042 8503 3041 8501 3040 8503
      3039 8501 3037 8504 3036 8503 3034 8505
      3031 8504 3035 8534 3069 8532
TIME...MOT...LOC 2245Z 270DEG 26KT 3051 8501 

$$

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 3:18 PM CDT	Special Weather Statement	TAE	Walton	42 min
May 11, 3:53 PM CDT	Special Weather Statement	TAE	Holmes, Walton	67 min
May 11, 4:06 PM CDT	Special Weather Statement	TAE	Washington	39 min
May 11, 4:15 PM CDT	Special Weather Statement	TAE	Washington	45 min
May 11, 4:18 PM CDT	Special Marine Warning	TAE		117 min
May 11, 5:34 PM CDT	Areal Flood Advisory	TAE	Jackson	116 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.