Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Dec 21, 2021, 8:15 AM EST for Hillsborough County, Manatee County, Sarasota County, Florida. It was in force for 30 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
- Dec 21, 2021, 8:15 AM EST (13:15 UTC)
- Expired
- Dec 21, 2021, 8:45 AM EST
- In force
- 30 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Hillsborough County, FL, Manatee County, FL, Sarasota County, FL
The radar
The Tampa radar (KTBW), 28 km from the middle of the area, began a volume at 13:14 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 |
|---|---|---|---|
| Dec 21, 8:21 AM EST | TSTM WND GST 45 | 1 S Whitfield, FL | ASOS STATION KSRQ SARASOTA BRADENT. |
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 |
|---|---|---|---|
| Dec 21, 5:22 AM EST | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 1.3 hours before the alert went out and 28 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
- 123 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 533 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 260 m²/s²
- 0-3 km storm-relative helicity
- 340 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted.
646 WUUS52 KTBW 211315 SVRTBW FLC057-081-115-211345- /O.NEW.KTBW.SV.W.0030.211221T1315Z-211221T1345Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Tampa Bay Area Ruskin FL 815 AM EST Tue Dec 21 2021 The National Weather Service in Ruskin has issued a * Severe Thunderstorm Warning for... Northern Manatee County in west central Florida... South central Hillsborough County in west central Florida... Northwestern Sarasota County in west central Florida... * Until 845 AM EST. * At 814 AM EST, a severe thunderstorm was located over West Samoset, or over Bradenton, moving east at 50 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Sarasota, Bradenton, Palmetto, Bayshore Gardens, Lake Manatee State Park, Lakewood Ranch, Ellenton, Samoset, South Bradenton and Palma Sola. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 1000 AM EST for west central Florida. For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. A Tornado Watch remains in effect until 1000 AM EST for west central Florida. && LAT...LON 2735 8262 2752 8267 2766 8227 2744 8215 TIME...MOT...LOC 1314Z 253DEG 46KT 2746 8255 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 |
|---|---|---|---|---|
| Dec 21, 3:40 AM EST | Rip Current Statement | TBW | Charlotte, Hillsborough, Lee, Manatee, Pinellas, Sarasota | 27 hr |
| Dec 21, 3:40 AM EST | High Surf Advisory | TBW | Charlotte, Hillsborough, Lee, Manatee, Pinellas, Sarasota | 15 hr |
| Dec 21, 4:05 AM EST | Gale Warning | TBW | 10 hr | |
| Dec 21, 4:14 AM EST | Special Marine Warning | TBW | 46 min | |
| Dec 21, 5:03 AM EST | Special Marine Warning | TBW | 42 min | |
| Dec 21, 6:55 AM EST | Special Marine Warning | TBW | 50 min | |
| Dec 21, 7:46 AM EST | Special Marine Warning | TBW | 59 min | |
| Dec 21, 8:08 AM EST | Special Weather Statement | TBW | Hillsborough, Manatee, Pinellas, Sarasota | 52 min |
| Dec 21, 8:51 AM EST | Wind Advisory | TBW | Charlotte, DeSoto, Hardee, Highlands, Lee | 4 hr |
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.