Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 20, NWS Tampa Bay, FL

June 18, 2000Pasco County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jun 18, 2000, 7:34 PM EDT for Pasco County, Florida. It was in force for 26 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: Jun 18, 2000, 7:34 PM EDT (23:34 UTC)
Expired: Jun 18, 2000, 8:00 PM EDT
In force: 26 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

County Pasco County, FL

What was reported inside it

Time	Report	Where	Remark
Jun 18, 7:40 PM EDT	Thunderstorm Wind 52 E	Elfers, FL	Skywarn Spotters reported estimated thunderstorm wind gusts of up to 60 mph from near Elfers to Port Richey over western Pasco county. Several trees and power lines were downed on Rowan Road north of State Road 54 near Elfers.

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, 11.6 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-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: 672 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: -5 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.

283 
WUUS52 KTBW 182334
SVRTBW
FLC101-190000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
734 PM EDT SUN JUN 18 2000

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN PASCO COUNTY.

* UNTIL 800 PM EDT

* AT 728 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL 7 MILES SOUTHEAST OF HUDSON...
  MOVING NORTHWEST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  JASMINE ESTATES.
  HUDSON.

SEVERE THUNDERSTORMS CONTAIN WIND GUSTS OF 60 MPH OR HIGHER...AND
LARGE HAIL THE SIZE OF DIMES OR LARGER. MOVE TO A PLACE OF SAFETY.

$$

LAT...LON 2819 8261 2830 8249 2843 8265 2835 8274
          2825 8272

33
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 Jun 18, 1:47 PM EDT, 5 hours 47 minutes earlier.

Area forecast discussion, Jun 18, 1:47 PM EDT, 5 hours 47 minutes before

WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
147 PM EDT SUN JUN 18 2000

EARLY SUMMER PATTERN IN FULL SWING ACROSS THE REGION.  THE DEVIL IS
IN THE DETAILS...BUT WILL KEEP THE FCST BROAD-BRUSHED AFTER THE
FIRST PERIOD DUE TO MODEL DIFFICULTIES IN HANDLING MESO FEATURES.

SYNOPTICALLY...THROUGH 60H...H50 RIDGE WILL HOLD FORTH.  DISTURBANCE
AFFECTING THE CENTRAL BAHAMAS TODAY WILL SHEAR OUT AS IT SLIDES
ACROSS THE FL STRAITS DURING THE NEXT 48H...AND IN THE END WILL
LIKELY HAVE LITTLE DIRECT IMPACT ON OUR WX.

AS FAR AS THE MODELS GO...ONLY THE AVN MAINTAINS PERSISTENT LOW
LEVEL E FLOW THROUGH 60H.  BOTH THE ETA AND NGM SLIDE SFC-H85 RIDGE
AXES OVER US...ALLOWING FOR WCSB/ECSB INTERACTION IN THE LOW
LEVELS.  OF COURSE...FLOW ABV H60 IS ENE...AND THIS STEERING WOULD
STILL FAVOR THE COASTAL COS...AT LEAST THROUGH MON.

THE FCST:  TONIGHT...ACTIVITY STARTING A BIT LATER TODAY...PROBABLY
A RESULT OF SLOWER DAYTIME HEATING TO CONVECTIVE TEMP (AROUND 91).
STILL...SHOWERS DEVELOPING ACRS THE S 1/2 OF THE CWFA...AND ECSB
ACTIVITY HAS BEGUN N OF THE SPACECOAST.

EXPECT INTERIOR COUNTIES TO CRANK UP BETWEEN 2 AND 4 PM...THEN
ACTIVITY TO SHIFT TOWARDS THE WCSB BY 5 OR SO.  BOUNDARY/SEA BREEZE
INTERACTIONS SHOULD LIGHT UP THE COAST AGAIN THIS EVENING.  OF
INTEREST IS LASTING MOISTURE AFTER MIDNIGHT...ESP ACRS THE FAR
N.  WILL SEPARATE LEVY CO OUT FOR TIMING PURPOSES (NONE)...AND GO
LIKELY COAST (ENDING AROUND MIDNIGHT)...SCT INTERIOR (EVE).

MON...DUE TO UNCERTAINTY OF SEA BREEZE INTERACTION...PREFER TO PLAY
IT SAFE AND BROAD BRUSH A 40 POP EVERYWHERE FOR AFTN.  WITH WCSB
A BIT MORE ACTIVE EARLIER...ACTIVITY COULD FIRE ALONG IT BEFORE 3
PM...WITH COVERAGE INCREASING DURING LATE AFTN/EARLY EVE FROM
BOUNDARY INTERACTIONS...ECSB/WCSB COLLISION...ETC.

MON NIGHT...AGAIN...WILL NOT GET CUTE DUE TO UNCERTAINTY.  MODIFYING
THE AVN GIVES AN EARLIER END TO PCPN EVERYWHERE...WITH PERHAPS MORE
RAPIDLY DECREASING COVERAGE.  WILL CALL IT A 30 POP FOR EVE...THEN
FAIR.

TUE...THIS TIME...WILL FAVOR THE INTERIOR COS FOR AFTN CONVECTION
FOR A NUDGE UPWARD ON POP (40 VS. 30 ON COAST).

EXTENDED...MRF LINKS UP WHATS LEFT OF SHEARED SHORT WAVE WITH A
DEEPENING TROUGH ACROSS THE MIDWEST.  THOUGH THE MID LATITUDE
TROUGH WILL NEVER MAKE IT...ITS IMPRINT MAY LEAVE A WEAKNESS IN THE
CENTRAL/ERN GULFMEX.  THIS IN TURN WILL INCREASE H50 S FLOW...
JUSTIFYING HIGHER MEAN RH VALUES ACRS THE REGION.

WITH THIS IN MIND...NO SENSE IN TRYING TO TIME PCPN.  PCLDY/SCT
SHOWERS/TSTMS AND PERSISTENCE TEMPS THROUGH FRI.

MARINE:  WILL SEPARATE N 2 LEGS FROM THE S LEG FOR E/SE COMPONENT
(VS SE/S COMPONENT).  OTRW...NOSIG WX OUTSIDE OF TSTMS.

FIRE WX:  RH VALUES 50 PCT OR GREATER AND GENERALLY LIGHT WINDS
PRECLUDE ANY HEADLINES.

PRELIM NUMBER:
TPA BB 073/091/074/091 5333
FMY BB 073/093/073/092 6433 88

.TBW...NONE.

GOLDSMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 5:10 PM EDT	Severe Thunderstorm Warning	TBW	Sarasota	35 min

Nearby

Severe Thunderstorm Warnings in Florida, 2000 Every severe thunderstorm warning in 2000

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.