Alert archive / Florida / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 21, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Mar 31, 2001, 2:27 PM EST for Polk County, Florida. It was in force for 33 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Mar 31, 2001, 2:27 PM EST (19:27 UTC)
- Expired
- Mar 31, 2001, 3:00 PM EST
- In force
- 33 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Polk County, FL
The radar
The Tampa radar (KTBW), 74 km from the middle of the area, began a volume at 19:30 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 |
|---|---|---|---|
| Mar 31, 2:38 PM EST | Hail 1.75 | Polk City, FL | Golfball to dime sized hail was reported by Skywarn Spotters from Haines City to Polk City in northern Polk county. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Cape Canaveral, FL (KXMR), launched 12:00Z, 7.5 hours before the alert went out and 131 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
- 1036 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 575 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS52 KTBW 311927 SVRTBW FLC105-312000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 227 PM EST SAT MAR 31 2001 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN POLK COUNTY IN FLORIDA. * UNTIL 300 PM EST. * AT 227 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL...OVER NORTHWESTERYN POLK COUNTY...MOVING NORTHEAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT... POLK CITY. $$ LAT...LON 2825 8200 2808 8192 2825 8140 2845 8150 NNNN
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 1:46 PM EST | Severe Thunderstorm Warning | TBW | Hillsborough, Pasco | 29 min |
| Mar 31, 2:02 PM EST | Severe Thunderstorm Warning | TBW | Pinellas | 28 min |
| Mar 31, 2:22 PM EST | Severe Thunderstorm Warning | TBW | Hillsborough | 38 min |
| Mar 31, 3:01 PM EST | Severe Thunderstorm Warning | TBW | Hillsborough, Polk | 29 min |
| Mar 31, 3:31 PM EST | Severe Thunderstorm Warning | TBW | Polk | 44 min |
| Mar 31, 4:15 PM EST | Severe Thunderstorm Warning | TBW | Polk | 25 min |
| Mar 31, 5:18 PM EST | Severe Thunderstorm Warning | TBW | Manatee, Sarasota | 57 min |
| Mar 31, 6:27 PM EST | Severe Thunderstorm Warning | TBW | Sarasota | 48 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2001Every severe thunderstorm warning in 2001
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.