Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Tampa Bay, FL

April 19, 2021Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 19, 2021, 4:26 AM EDT for Polk County, Florida. It was in force for 34 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: Apr 19, 2021, 4:26 AM EDT (08:26 UTC)
Expired: Apr 19, 2021, 5:00 AM EDT
In force: 34 min
Issued by: NWS Tampa Bay, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Polk County, FL

The radar

The Tampa radar (KTBW), 67 km from the middle of the area, began a volume at 08:28 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 00:00Z, 8.4 hours before the alert went out and 67 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: 1430 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

680 
WUUS52 KTBW 190826
SVRTBW
FLC105-190900-
/O.NEW.KTBW.SV.W.0012.210419T0826Z-210419T0900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tampa Bay Area Ruskin FL
426 AM EDT Mon Apr 19 2021

The National Weather Service in Ruskin has issued a

* Severe Thunderstorm Warning for...
  South central Polk County in central Florida...

* Until 500 AM EDT.

* At 425 AM EDT, a severe thunderstorm was located 10 miles north of
  Wauchula, moving east at 20 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Fort Meade.

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 a
small central room in a sturdy structure.

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

&&

LAT...LON 2765 8184 2774 8187 2783 8164 2776 8158
      2765 8158
TIME...MOT...LOC 0825Z 260DEG 17KT 2769 8181 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

TBW

1 follow-up statement

936 
WWUS52 KTBW 190840
SVSTBW

Severe Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
440 AM EDT Mon Apr 19 2021

FLC105-190900-
/O.CON.KTBW.SV.W.0012.000000T0000Z-210419T0900Z/
Polk FL-
440 AM EDT Mon Apr 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 AM EDT
FOR SOUTH CENTRAL POLK COUNTY...

At 439 AM EDT, a severe thunderstorm was located 12 miles northeast
of Wauchula, moving east at 25 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

This severe thunderstorm will remain over mainly rural areas of south
central Polk County.

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 a
small central room in a sturdy structure.

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

&&

LAT...LON 2765 8173 2772 8175 2779 8160 2776 8158
      2765 8158
TIME...MOT...LOC 0839Z 263DEG 20KT 2769 8170 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

TBW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 9:23 PM EDT	Special Marine Warning	TBW		37 min
Apr 18, 9:26 PM EDT	Tornado Warning	TBW	Hillsborough, Pasco, Pinellas	34 min
Apr 18, 9:55 PM EDT	Special Weather Statement	TBW	Pinellas	35 min
Apr 18, 10:53 PM EDT	Special Weather Statement	TBW	Polk	22 min
Apr 18, 11:16 PM EDT	Special Weather Statement	TBW	Polk	44 min
Apr 19, 3:33 AM EDT	Special Marine Warning	TBW		57 min
Apr 19, 4:14 AM EDT	Special Weather Statement	TBW	Polk	46 min
Apr 19, 4:18 AM EDT	Special Weather Statement	TBW	Manatee	27 min
Apr 19, 4:57 AM EDT	Special Marine Warning	TBW		63 min
Apr 19, 5:01 AM EDT	Special Weather Statement	TBW	Polk	44 min
Apr 19, 5:42 AM EDT	Special Weather Statement	TBW	Hardee	48 min
Apr 19, 5:48 AM EDT	Severe Thunderstorm Warning	TBW	Polk	42 min
Apr 19, 5:58 AM EDT	Areal Flood Advisory	TBW	Polk	2 hr
Apr 19, 6:06 AM EDT	Special Marine Warning	TBW		39 min
Apr 19, 6:36 AM EDT	Special Weather Statement	TBW	Hardee	39 min
Apr 19, 6:44 AM EDT	Tornado Warning	TBW	Hardee	36 min
Apr 19, 7:19 AM EDT	Special Weather Statement	TBW	Highlands	41 min
Apr 19, 7:57 AM EDT	Areal Flood Advisory	TBW	Hardee, Highlands	2 hr
Apr 19, 8:00 AM EDT	Special Weather Statement	TBW	Highlands	60 min
Apr 19, 10:36 AM EDT	Special Weather Statement	TBW	Charlotte	39 min
Apr 19, 2:22 PM EDT	Rip Current Statement	TBW	Charlotte, Hillsborough, Lee, Manatee, Pinellas, Sarasota	30 hr
Apr 19, 3:00 PM EDT	Special Weather Statement	TBW	Highlands	30 min
Apr 19, 3:33 PM EDT	Severe Thunderstorm Warning	TBW	Highlands	27 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.