Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 8, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 11, 2021, 1:01 PM EDT for 4 counties in Florida. It was in force for 29 min. 2 reports 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
- Apr 11, 2021, 1:01 PM EDT (17:01 UTC)
- Expired
- Apr 11, 2021, 1:30 PM EDT
- In force
- 29 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Hardee County, FL, Hillsborough County, FL, Manatee County, FL, Polk County, FL
The radar
The Tampa radar (KTBW), 53 km from the middle of the area, began a volume at 17:01 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 |
|---|---|---|---|
| Apr 11, 1:20 PM EDT | HAIL 2 | 1 Ne Wauchula, FL | TIME ESTIMATED FROM RADAR. |
| Apr 11, 1:25 PM EDT | HAIL 1 | 1 E Wauchula, FL | HAIL UP TO 1 INCH REPORTED JUST EAST OF WAUCHULA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 11, 8:15 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 5.0 hours before the alert went out and 53 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.
- Mixed-layer CAPE
- 1004 J/kg
- Mixed-layer CIN
- -131 J/kg
- Mixed-layer LCL
- 1005 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 288 m²/s²
- 0-3 km storm-relative helicity
- 296 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted.
842
WUUS52 KTBW 111701
SVRTBW
FLC049-057-081-105-111730-
/O.NEW.KTBW.SV.W.0008.210411T1701Z-210411T1730Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tampa Bay Area Ruskin FL
101 PM EDT Sun Apr 11 2021
The National Weather Service in Ruskin has issued a
* Severe Thunderstorm Warning for...
Hardee County in central Florida...
Northeastern Manatee County in west central Florida...
Southwestern Polk County in central Florida...
Southeastern Hillsborough County in west central Florida...
* Until 130 PM EDT.
* At 100 PM EDT, severe thunderstorms were located along a line
extending from 15 miles northwest of Wauchula to 11 miles west of
Ona to 9 miles northwest of Myakka City, moving east at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Wauchula, Ona, Sweetwater, Fort Meade, Bowling Green, Zolfo
Springs, Myakka Head, Duette and Fort Green.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2776 8155 2753 8159 2737 8174 2740 8242
2755 8220 2778 8210
TIME...MOT...LOC 1700Z 272DEG 52KT 2767 8203 2755 8210 2747 8225
HAIL...0.75IN
WIND...60MPH
$$
TBW1 follow-up statement
431
WWUS52 KTBW 111718
SVSTBW
Severe Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
118 PM EDT Sun Apr 11 2021
FLC057-111727-
/O.CAN.KTBW.SV.W.0008.000000T0000Z-210411T1730Z/
Hillsborough FL-
118 PM EDT Sun Apr 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HILLSBOROUGH
COUNTY IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 400 PM EDT for
central and west central Florida.
LAT...LON 2776 8155 2753 8159 2737 8174 2740 8212
2750 8202 2765 8193
TIME...MOT...LOC 1717Z 272DEG 52KT 2766 8179 2754 8186 2746 8201
$$
FLC049-081-105-111730-
/O.CON.KTBW.SV.W.0008.000000T0000Z-210411T1730Z/
Hardee FL-Manatee FL-Polk FL-
118 PM EDT Sun Apr 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR HARDEE...EAST CENTRAL MANATEE AND SOUTH CENTRAL POLK COUNTIES...
At 117 PM EDT, severe thunderstorms were located along a line
extending from 16 miles south of Bartow to near Wauchula to near Ona,
moving east at 60 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Wauchula, Ona, Sweetwater, Bowling Green and Zolfo Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2776 8155 2753 8159 2737 8174 2740 8212
2750 8202 2765 8193
TIME...MOT...LOC 1717Z 272DEG 52KT 2766 8179 2754 8186 2746 8201
HAIL...<.75IN
WIND...60MPH
$$
TBWThe office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 3:32 AM EDT | Small Craft Advisory | TBW | 16 hr | |
| Apr 11, 5:46 AM EDT | Special Weather Statement | TBW | Gilchrist | 44 min |
| Apr 11, 9:13 AM EDT | Special Marine Warning | TBW | 92 min | |
| Apr 11, 9:14 AM EDT | Rip Current Statement | TBW | Charlotte, Hillsborough, Lee, Manatee, Pinellas, Sarasota | 15 hr |
| Apr 11, 9:28 AM EDT | Special Weather Statement | TBW | Hernando | 47 min |
| Apr 11, 10:44 AM EDT | Special Marine Warning | TBW | 61 min | |
| Apr 11, 11:09 AM EDT | Severe Thunderstorm Warning | TBW | Hernando, Hillsborough, Pasco, Pinellas, Sumter | 32 min |
| Apr 11, 11:49 AM EDT | Special Marine Warning | TBW | 56 min | |
| Apr 11, 11:56 AM EDT | Special Weather Statement | TBW | Hillsborough, Polk | 64 min |
| Apr 11, 12:23 PM EDT | Special Weather Statement | TBW | Hillsborough, Pinellas | 37 min |
| Apr 11, 1:32 PM EDT | Special Weather Statement | TBW | Hardee, Highlands | 43 min |
| Apr 11, 1:47 PM EDT | Severe Thunderstorm Warning | TBW | Highlands | 28 min |
| Apr 11, 3:13 PM EDT | Special Marine Warning | TBW | 62 min | |
| Apr 11, 3:41 PM EDT | Special Weather Statement | TBW | Charlotte, Lee | 49 min |
| Apr 11, 4:08 PM EDT | Severe Thunderstorm Warning | TBW | Lee | 17 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2021Every 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.