Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 13, NWS Tampa Bay, FL

March 29, 2001Hillsborough County, Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Mar 29, 2001, 11:30 AM EST for Hillsborough County, Polk County, Florida. It was in force for 30 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 29, 2001, 11:30 AM EST (16:30 UTC)
Expired: Mar 29, 2001, 12:00 PM EST
In force: 30 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

Counties Hillsborough County, FL, Polk County, FL

What was reported inside it

Time	Report	Where	Remark
Mar 29, 11:40 AM EST	Hail 1.75	Haines City, FL	Golfball sized hail was reported by Polk county emergency management at Baseball City near the intersection of Interstate 4 and U.S. Highway 27 over extreme northeast 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 29, 9:15 AM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 4.5 hours before the alert went out and 45 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 954 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 623 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 343 m²/s²
0-3 km storm-relative helicity: 401 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 12.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS52 KTBW 291631
SVRTBW
FLC057-105-291700-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1130 AM EST THU MAR 29 2001

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  POLK COUNTY IN FLORIDA.
  EASTERN HILLSBOROUGH COUNTY IN FLORIDA.

* UNTIL NOON EST.

* AT 1130 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS...
  FROM 9 MILES NORTH OF HAINES CITY TO 34 MILES SOUTHWEST OF
  LAKELAND...MOVING EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL AFFECT...
  SUN CITY CENTER.
  CRYSTAL LAKE.
  AUBURNDALE.
  LAKE ALFRED.
  MULBERRY.
  HAINES CITY.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE
INDOORS IMMEDIATELY. DO NOT USE ELECTRICAL APPLIANCES OR TELEPHONES.

THIS IS A DANGEROUS STORM MOVE INTO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING...AWAY FROM WINDOWS. COVER YOUR HEAD WITH
PILLOWS OR CUSHIONS.

$$

LAT...LON 2828 8165 2765 8252 2780 8196 2842 8108

67
NNNN

The office that day

Everything else NWS Tampa Bay, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 29, 9:14 AM EST	Severe Thunderstorm Warning	TBW	Levy	46 min
Mar 29, 9:25 AM EST	Severe Thunderstorm Warning	TBW	Citrus, Hernando	50 min
Mar 29, 9:25 AM EST	Severe Thunderstorm Warning	TBW	Pasco, Pinellas	50 min
Mar 29, 10:00 AM EST	Tornado Warning	TBW	Hernando, Pasco	30 min
Mar 29, 10:10 AM EST	Severe Thunderstorm Warning	TBW	Sumter	35 min
Mar 29, 10:13 AM EST	Severe Thunderstorm Warning	TBW	Hillsborough, Pinellas	32 min
Mar 29, 10:33 AM EST	Severe Thunderstorm Warning	TBW	Pasco	27 min
Mar 29, 10:45 AM EST	Severe Thunderstorm Warning	TBW	Polk	45 min
Mar 29, 10:59 AM EST	Severe Thunderstorm Warning	TBW	Pasco, Sumter	31 min
Mar 29, 2:50 PM EST	Severe Thunderstorm Warning	TBW	Manatee, Sarasota	55 min

Nearby

Severe Thunderstorm Warnings in Florida, 2001 Every 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.