Alert archive / Florida / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 49, NWS Tampa Bay, FL

July 29, 2002Hillsborough County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 29, 2002, 4:59 PM EDT for Hillsborough County, Florida. It was in force for 46 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: Jul 29, 2002, 4:59 PM EDT (20:59 UTC)
Expired: Jul 29, 2002, 5:45 PM EDT
In force: 46 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

County Hillsborough County, FL

The radar

The Tampa radar (KTBW), 23 km from the middle of the area, began a volume at 21:00 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 29, 5:41 PM EDT	Hail 0.75	Seffner, FL

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

Tampa Bay, FL (KTBW), launched 12:00Z, 9.0 hours before the alert went out and 23 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: 826 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1146 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

275 
WUUS52 KTBW 292059
SVRTBW
FLC057-292145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
456 PM EDT MON JUL 29 2002

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL HILLSBOROUGH COUNTY IN FLORIDA.

* UNTIL 545 PM EDT.

* AT 456 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH DAMAGING WINDS...10 MILES SOUTH OF        
  RUSKIN...MOVING NORTH AT 20 TO 25 MPH. AT 450 PM...THE NATIONAL    
  WEATHER SERVICE IN RUSKIN RECEIVED A WIND GUST OF 48 MPH AHEAD OF  
  THE APPROACHING STORM.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  WIMAUMA.
  RUSKIN.
  APOLLO BEACH.
  
SEVERE THUNDERSTORMS CONTAIN WIND GUSTS OF 60 MPH OR HIGHER...AND
HAIL THE SIZE OF DIMES OR LARGER. MOVE TO A PLACE OF SAFETY.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. MOVE TO A PLACE OF SAFETY...AN INTERIOR ROOM IN THE LOWEST
FLOOR OF YOUR HOUSE OR BUSINESS.

WIND GUSTS TO 60 MPH WILL CAUSE SOME STRUCTURAL DAMAGE...MAINLY TO
TREES AND POWER LINES. POORLY ANCHORED ROOFS...MOBILE HOMES...AND
SHEDS ARE ALSO AT RISK.

$$

LAT...LON 2765 8253 2764 8229 2796 8228 2795 8254

33

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 2:35 PM EDT	Special Marine Warning	TBW		55 min
Jul 29, 3:25 PM EDT	Severe Thunderstorm Warning	TBW	Charlotte, Sarasota	50 min
Jul 29, 4:13 PM EDT	Severe Thunderstorm Warning	TBW	Manatee	32 min
Jul 29, 4:22 PM EDT	Tornado Warning	TBW	Manatee	23 min
Jul 29, 4:40 PM EDT	Special Marine Warning	TBW		80 min
Jul 29, 4:43 PM EDT	Severe Thunderstorm Warning	TBW	Manatee	32 min
Jul 29, 5:31 PM EDT	Tornado Warning	TBW	Lee	29 min
Jul 29, 6:30 PM EDT	Severe Thunderstorm Warning	TBW	Pasco	30 min
Jul 29, 6:45 PM EDT	Special Marine Warning	TBW		75 min
Jul 29, 7:00 PM EDT	Severe Thunderstorm Warning	TBW	Pasco	30 min
Jul 29, 7:05 PM EDT	Severe Thunderstorm Warning	TBW	Citrus, Hernando	40 min

Nearby

Severe Thunderstorm Warnings in Florida, 2002 Every severe thunderstorm warning in 2002

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.