Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 24, NWS Tampa Bay, FL

August 12, 2021Hillsborough County, Pinellas County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Aug 12, 2021, 5:36 PM EDT for Hillsborough County, Pinellas County, Florida. It was in force for 24 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 12, 2021, 5:36 PM EDT (21:36 UTC)
Expired: Aug 12, 2021, 6:00 PM EDT
In force: 24 min
Issued by: NWS Tampa Bay, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Hillsborough County, FL, Pinellas County, FL

The radar

The Tampa radar (KTBW), 34 km from the middle of the area, began a volume at 21:41 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

Tampa Bay, FL (KTBW), launched 12:00Z, 9.6 hours before the alert went out and 34 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: 1240 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1012 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: -39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

642 
WUUS52 KTBW 122136
SVRTBW
FLC057-103-122200-
/O.NEW.KTBW.SV.W.0024.210812T2136Z-210812T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tampa Bay Area Ruskin FL
536 PM EDT Thu Aug 12 2021

The National Weather Service in Ruskin has issued a

* Severe Thunderstorm Warning for...
  Southern Pinellas County in west central Florida...
  Southwestern Hillsborough County in west central Florida...

* Until 600 PM EDT.

* At 536 PM EDT, a severe thunderstorm was located over Saint
  Petersburg, moving southwest at 10 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  St. Petersburg, Pinellas Park, Seminole, Gulfport, St. Pete Beach,
  Treasure Island, Kenneth City, South Pasadena, Madeira Beach and
  Redington Shores.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2787 8262 2771 8254 2756 8277 2774 8286
      2781 8289 2782 8287
TIME...MOT...LOC 2136Z 065DEG 10KT 2777 8266 

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

$$

TBW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 3:56 PM EDT	Special Marine Warning	TBW		49 min
Aug 12, 4:16 PM EDT	Special Weather Statement	TBW	Hillsborough	44 min
Aug 12, 4:33 PM EDT	Special Weather Statement	TBW	Sumter	42 min
Aug 12, 5:01 PM EDT	Special Weather Statement	TBW	Pasco, Pinellas	44 min
Aug 12, 5:02 PM EDT	Special Weather Statement	TBW	Manatee	43 min
Aug 12, 5:04 PM EDT	Special Marine Warning	TBW		56 min
Aug 12, 5:32 PM EDT	Special Weather Statement	TBW	Hardee	28 min
Aug 12, 5:41 PM EDT	Severe Thunderstorm Warning	TBW	Hardee, Hillsborough, Manatee, Polk	21 min
Aug 12, 5:52 PM EDT	Special Weather Statement	TBW	Manatee	38 min
Aug 12, 5:53 PM EDT	Special Weather Statement	TBW	Pasco	37 min
Aug 12, 5:57 PM EDT	Severe Thunderstorm Warning	TBW	Manatee, Sarasota	37 min
Aug 12, 5:59 PM EDT	Special Marine Warning	TBW		61 min
Aug 12, 6:00 PM EDT	Special Marine Warning	TBW		45 min
Aug 12, 6:29 PM EDT	Special Weather Statement	TBW	Hillsborough	46 min
Aug 12, 6:59 PM EDT	Special Marine Warning	TBW		31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.