Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 21, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 12, 2021, 3:26 PM EDT for Hillsborough County, Pinellas County, Florida. It was in force for 19 min. 4 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
- Jul 12, 2021, 3:26 PM EDT (19:26 UTC)
- Expired
- Jul 12, 2021, 3:45 PM EDT
- In force
- 19 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), 35 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 12, 3:28 PM EDT | TSTM WND GST 41 | 1 W Macdill Air Force, FL | AWOS STATION AT MACDILL AFB TAMPA REPORTED 41 MPH WIND GUST. |
| Jul 12, 3:31 PM EDT | TSTM WND GST 43 | 2 S Feather Sound, FL | MESONET STATION IN SEMINOLE REPORTED 43 MPH WIND GUST. |
| Jul 12, 3:31 PM EDT | TSTM WND GST 43 | Tampa, FL | TPA ASOS REPORTED 37 KNOT WIND GUST AT 1931Z |
| Jul 12, 3:32 PM EDT | MARINE TSTM WIND 52 | 2 Wnw Feather Sound, FL | PIE ASOS REPORTED A 45 KNOT WIND GUSTS AT 1932Z. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 7.4 hours before the alert went out and 35 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
- 1557 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 960 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- -26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
645 WUUS52 KTBW 121926 SVRTBW FLC057-103-122000- /O.NEW.KTBW.SV.W.0021.210712T1926Z-210712T2000Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Tampa Bay Area Ruskin FL 326 PM EDT Mon Jul 12 2021 The National Weather Service in Ruskin has issued a * Severe Thunderstorm Warning for... Central Pinellas County in west central Florida... Northwestern Hillsborough County in west central Florida... * Until 400 PM EDT. * At 326 PM EDT, severe thunderstorms were located along a line extending from Gandy to near East Lake-Orient Park, moving northwest 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... Tampa, St. Petersburg, Clearwater, Largo, Pinellas Park, Temple Terrace, Safety Harbor, West Park, Oldsmar and Busch Gardens. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 2802 8279 2815 8239 2793 8228 2778 8266 TIME...MOT...LOC 1926Z 143DEG 18KT 2789 8259 2796 8235 HAIL...0.75IN WIND...60MPH $$ TBW
2 follow-up statements
000 WWUS52 KTBW 121940 SVSTBW Severe Weather Statement National Weather Service Tampa Bay Area Ruskin FL 340 PM EDT Mon Jul 12 2021 FLC057-103-122000- /O.CON.KTBW.SV.W.0021.000000T0000Z-210712T2000Z/ Pinellas FL-Hillsborough FL- 340 PM EDT Mon Jul 12 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT FOR CENTRAL PINELLAS AND NORTHWESTERN HILLSBOROUGH COUNTIES... At 339 PM EDT, severe thunderstorms were located along a line extending from near Clearwater to University, moving northwest at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Tampa, St. Petersburg, Clearwater, Pinellas Park, Temple Terrace, Safety Harbor, West Park, Oldsmar, Busch Gardens and University Of Tampa. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 2802 8279 2815 8239 2795 8234 2784 8267 TIME...MOT...LOC 1939Z 136DEG 30KT 2798 8270 2805 8246 HAIL...<.75IN WIND...60MPH $$ TBW
263
WWUS52 KTBW 121945
SVSTBW
Severe Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
345 PM EDT Mon Jul 12 2021
FLC057-103-121955-
/O.CAN.KTBW.SV.W.0021.000000T0000Z-210712T2000Z/
Pinellas FL-Hillsborough FL-
345 PM EDT Mon Jul 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL PINELLAS AND
NORTHWESTERN HILLSBOROUGH COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled. Lightning is an ever
present threat with thunderstorms and will remain a danger until
this storm has completely moved out of the area.
LAT...LON 2802 8279 2815 8239 2795 8234 2784 8267
TIME...MOT...LOC 1942Z 143DEG 18KT 2799 8271 2806 8247
$$
TBWThe office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 2:57 PM EDT | Special Marine Warning | TBW | 63 min | |
| Jul 12, 3:00 PM EDT | Special Weather Statement | TBW | Hillsborough | 45 min |
| Jul 12, 3:10 PM EDT | Special Weather Statement | TBW | Sumter | 50 min |
| Jul 12, 3:24 PM EDT | Special Weather Statement | TBW | Hillsborough, Pinellas | 51 min |
| Jul 12, 3:57 PM EDT | Special Marine Warning | TBW | 63 min | |
| Jul 12, 3:57 PM EDT | Severe Thunderstorm Warning | TBW | Pinellas | 19 min |
| Jul 12, 4:14 PM EDT | Severe Thunderstorm Warning | TBW | Hernando, Pasco | 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.