Alert archive / Florida / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 18, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Mar 31, 2001, 1:46 PM EST for Hillsborough County, Pasco County, Florida. It was in force for 29 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, 1:46 PM EST (18:46 UTC)
- Expired
- Mar 31, 2001, 2:15 PM EST
- In force
- 29 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
Counties Hillsborough County, FL, Pasco County, FL
The radar
The Tampa radar (KTBW), 45 km from the middle of the area, began a volume at 18:50 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, 2:00 PM EST | Hail 0.75 | Thonotosassa, FL | Dime sized hail was reported by a park ranger at the Hillsborough River State Park along U.S. Highway 301. |
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, 6.8 hours before the alert went out and 190 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.
957 WUUS52 KTBW 311846 SVRTBW FLC057-101-311915- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 146 PM EST SAT MAR 31 2001 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN HILLSBOROUGH COUNTY IN FLORIDA. SOUTHEASTERN PASCO COUNTY IN FLORIDA. * UNTIL 215 PM EST. * AT 146 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL...5 MILES NORTH OF TEMPLE TERRACE...MOVING EAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT... THONOTOSASSA. HILLSBOROUGH RIVER STATE PARK. ZEPHYRHILLS. SEVERE THUNDERSTORMS CONTAIN WIND GUSTS OF 60 MPH OR HIGHER...AND HAIL THE SIZE OF DIMES OR LARGER. MOVE TO A PLACE OF SAFETY. $$ LAT...LON 2819 8248 2802 8243 2807 8208 2828 8214 NNNN
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Tampa Bay, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 31, 12:30 PM EST, 1 hour 16 minutes earlier.
Area forecast discussion, Mar 31, 12:30 PM EST, 1 hour 16 minutes before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1230 PM EST SAT MAR 31 2001
UPDATE: SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR THE SOUTHERN
HALF OF THE AREA. AMENDED ZONES TO REFLECT THIS. WILL LEAVE IT OUT
OF THE MARINE FORECAST AS BIGGEST THREAT IS INLAND FROM THE COAST.
.TBW...FLOOD WATCH TODAY FLZ050>052-055>057-060>061-062.
...FIRE WX WATCH SUNDAY FLZ039-042>043-052-056>057-061...AND
INTERIOR FLZ048>049.
ALSHEIMERThe office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 2:27 PM EST | Severe Thunderstorm Warning | TBW | Polk | 33 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.