Alert archive / Florida / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 54, NWS Tampa Bay, FL

August 1, 2002Sumter County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Aug 1, 2002, 1:53 PM EDT for Sumter County, Florida. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 1, 2002, 1:53 PM EDT (17:53 UTC)
Expired: Aug 1, 2002, 2:30 PM EDT
In force: 37 min
Issued by: NWS Tampa Bay, FL
Area: Counties, with a storm outline in the text

County Sumter County, FL

The radar

The Tampa radar (KTBW), 118 km from the middle of the area, began a volume at 17:54 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 5.9 hours before the alert went out and 118 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: 1916 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

938 
WUUS52 KTBW 011753
SVRTBW
FLC119-011830-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
154 PM EDT THU AUG 1 2002

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

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

* UNTIL 230 PM EDT

* AT 154 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL...9 MILES NORTHWEST OF
  BUSHNELL...MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  LAKE PANASOFFKEE.
  BUSHNELL.

THIS STORM HAS HAD A HISTORY OF PRODUCING DIME SIZE HAIL. SEEK 
SHELTER AS THIS STORM APPROACHES.

LAT...LON 2889 8217 2870 8223 2854 8210 2867 8197

$$

72

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 Aug 1, 9:30 AM EDT, 4 hours 23 minutes earlier.

Area forecast discussion, Aug 1, 9:30 AM EDT, 4 hours 23 minutes before

WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
930 AM EDT THU AUG 1 2002

...SHORT TERM...
UPPER LOW SEEN ON WATER VAPOR NICELY...JUST OFF THE SOUTHEAST GEORGIA
COAST AND EXPECTED TO REMAIN NEARLY STATIONARY WHILE DRAGGING A
DECENT SPOKE OF VORTICITY DOWN THE FLORIDA PENINSULA ON ITS WEST
SIDE. THIS COMBINED WITH ABUNDANT MOISTURE AND ONGOING SHOWERS
CURRENTLY ON RADAR...ALL POINT TO A DECENT SHOT OF PRECIP TODAY
ACROSS NORTHERN ZONES. MOISTURE DROPS OFF SLIGHTLY FURTHER SOUTH WITH
LOWER RAIN CHANCES EXPECTED TODAY...TAPERING TO 30% TOWARDS FMY.
ZONES HANDLE POPS WELL AND EXPECT NO CHANGES. FLOW AROUND THE UPPER
LOW OFF THE GULF HAS PRODUCED EXTENSIVE CLOUDINESS FROM TAMPA
NORTHWARD. SEE NO REASON WHY THIS WOULDNT CONTINUE...WILL THEREFORE
UPDATE SKY CONDITION TO MOSTLY CLOUDY.

...MARINE...
LOCAL BUOY OBS SHOWING WINDS AROUND 10 KNOTS FROM THE SOUTHWEST.
CURRENT PACKAGE LOOKS GOOD...NO CHANGES EXPECTED.

.TBW...NONE.

JTD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 1:28 PM EDT	Severe Thunderstorm Warning	TBW	Citrus	32 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.