Alert archive / Florida / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 11, NWS Tampa Bay, FL

May 31, 2002Pasco County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 31, 2002, 5:45 PM EDT for Pasco County, Florida. It was in force for 15 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
May 31, 2002, 5:45 PM EDT (21:45 UTC)
Expired
May 31, 2002, 6:00 PM EDT
In force
15 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Pasco County, FL

What was reported inside it

TimeReportWhereRemark
May 31, 6:04 PM EDTHail 1Zephyrhills, FLQuarter size hail was observed by the public just east of Zephyrhills.

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, 9.8 hours before the alert went out and 67 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-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2002-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1314 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2002-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1314 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
877 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
20 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.

709 
WUUS52 KTBW 312145
SVRTBW
FLC101-312200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
545 PM EDT FRI MAY 31 2002

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS EXTENDED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN PASCO COUNTY IN FLORIDA.

* UNTIL 600 PM EDT.

* AT 545 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS...OVER
  ZEPHYRHILLS...MOVING SOUTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  ZEPHYRHILLS.

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.

QUARTER SIZE HAIL IS LIKELY. MOVE INDOORS IMMEDIATELY.

$$

LAT...LON 2834 8215 2827 8229 2817 8223 2818 8211

88
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 May 31, 2:30 PM EDT, 3 hours 15 minutes earlier.

Area forecast discussion, May 31, 2:30 PM EDT, 3 hours 15 minutes before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
230 PM EDT FRI MAY 31 2002

CURRENTLY...A WEAK PRESSURE GRADIENT CONTINUES ACROSS THE PENINSULA
WITH EAST AND WEST COAST SEA BREEZES PUSHING INLAND. THUNDERSTORMS
HAVE DEVELOPED ALONG THE EAST COAST AND ARE MOVING NORTH BUT
REDEVELOPMENT OCCURS WESTWARD ALONG OUTFLOW BOUNDARIES. SIGNIFICANT
CONVECTION IS SLOW TO DEVELOP ALONG THE WEST COAST.

SHORT TERM FORECAST...ACTIVITY WILL DEVELOP JUST INLAND ALONG THE
EAST AND WEST COAST SEA BREEZE COLLISION. THUNDERTORMS ARE
ALIGHNED NORTH-SOUTH AND ARE DRIFING NORTH. THE SLOW
MOVEMENT WILL CAUSE SIGNIFICANT ACCUMULATIONS OF RAIN AND LOCALIZED
FLOODING OF LOW LYING AREAS. SOME STORMS MAY PRODUCE HAIL
AND STRONG WINDS.

LONGER TERM... SURFACE GRADIENT REMAINS LIGHT WITH RIDGE OVER GULF.
MID-UPPER LOW OVER GULF SLOWLY WEAKENS AS DOES UPPER JET. MID LEVEL
TEMPS WARM SLIGHTLY OVER THE NEXT FEW DAYS. WILL SETTLE INTO
MORE TYPICAL SUMMER PATTERN NEXT WEEK WITH AFTERNOON SEA BREEZES AND
RELATED CONVECTIVE ACTIVITY.

MARINE...VERY WEAK PRESSURE PATTERN CONTINUES WITH VARIABLE
WINDS IN THE 5-10 KNOT WITH AN ONSHORE SEA BREEZE COMPONENT EXPECTED
ALONG THE COAST EACH AFTERNOON THE NEXT SEVERAL DAYS. NO HIGHLIGHTS
EXPECTED.

FIRE WEATHER...NO CONCERNS TODAY OR SATURDAY AS RH VALUES REMAIN WELL
ABOVE WATCH/RED FLAG CRITERIA.

BKV TB 090/068 091/067 091 57533
TPA EB 090/073 091/074 090 57433
GIF TT 090/072 091/072 092 57735
SRQ EB 087/073 088/073 088 57433
FMY EB 091/072 092/073 090 57433

.TBW...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 4:13 PM EDTSevere Thunderstorm WarningTBWHillsborough32 min
May 31, 5:20 PM EDTSevere Thunderstorm WarningTBWPasco25 min
May 31, 6:03 PM EDTSevere Thunderstorm WarningTBWPasco, Polk27 min

Nearby

Severe Thunderstorm Warnings in Florida, 2002Every 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.