Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 69, NWS Tampa Bay, FL

June 18, 2001Pasco County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jun 18, 2001, 4:36 PM EDT for Pasco County, Florida. It was in force for 39 min. 2 reports 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, 2001, 4:36 PM EDT (20:36 UTC)
Expired: Jun 18, 2001, 5:15 PM EDT
In force: 39 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

County Pasco County, FL

The radar

The Tampa radar (KTBW), 67 km from the middle of the area, began a volume at 20:40 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
Jun 18, 4:45 PM EDT	Thunderstorm Wind	Land O Lakes, FL	A local utility company reported that thunderstorm winds downed numerous trees and power lines in and around Land O Lakes in Pasco county. Nearly 2,000 homes were without power for approximately one hour.
Jun 18, 4:53 PM EDT	Hail 0.75	Denham, FL	Dime sized hail that covered the ground was reported in Denham by a Skywarn Spotter.

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, 8.6 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: 227 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1193 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 11 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.

000 
WUUS52 KTBW 182037
SVRTBW

FLC101-182115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
436 PM EDT MON JUN 18 2001

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

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

* UNTIL 515 PM EDT.

* AT 436 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH DAMAGING WINDS...OVER SOUTHERN PASCO
  COUNTY...MOVING NORTH AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  LAND O' LAKES.
  MOON LAKE ESTATES.

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

$$

LAT...LON 2819 8260 2819 8239 2838 8236 2838 8262

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, 2:17 PM EDT, 2 hours 19 minutes earlier.

Area forecast discussion, Jun 18, 2:17 PM EDT, 2 hours 19 minutes before

WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
217 PM EDT MON JUN 18 2001

FORECAST PACKAGE RATHER CUT AND DRIED THROUGH THE SHORT TERM.
ABUNDANT MOISTURE...LEFTOVER WEAK UPPER DISTURBANCES...AND A
GENERAL WEAK SE FLOW BELOW H50 MEANS MORE ABUNDANT RAINFALL...WITH
TIMING MAINLY LATE AFTN AND EVENING.  CURR FCST WORDING ONLY NEEDS
A FEW TWEAKS.

MODELS ARE IN VERY GOOD AGREEMENT...WITH EACH CONTINUING A BROAD H50
SHEAR AXIS ACROSS N FL.  OTHER FIELDS ARE NEARLY IDENTICAL...
AVN/ETA PERHAPS A BIT MOISTER.

SHORT TERM:
STILL LIKE THE MESO-ETA DEPICTION OF PREDOMINANTLY LATE AFTN/EVE
(TIL MIDNIGHT) THUNDERSTORMS OVER THE COASTAL COS...A SHADE EARLIER
FOR THE INTERIOR COS.  ISOLD ACTIVITY MAY DEVELOP ALONG THE WCSB
LATE MORNING/EARLY AFTN...BUT WILL LEAVE OUT IN LIEU OF THE MORE
WIDESPREAD ACTIVITY LATER ON.  TEMPS A BIT COOLER INLAND GIVEN
PREDOMINANT E FLOW...AND RAIN COOLED AIR COMBINED WITH LIGHT FLOW
WILL KEEP MIN TEMPS NEAR OR JUST ABOVE 70.

EXTENDED:
UPPER TROUGH STILL ON TRACK TO DIG INTO THE ERN U.S.  NEW MRF SHOWS
THIS SYSTEM EVENTUALLY CUTTING OFF OVER THE TN VALLEY THEN
RETROGRADING W EARLY NEXT WEEK.  SUCH SYSTEMS ARE NOT UNCOMMON IN
LATE JUNE...AND TEND TO KEEP THE RAIN MACHINE GOING OVER THE E
U.S. FOR US...THE SOLN IS A BIT MURKY REGARDING TIMING.  W ATLC HIGH
PRES WILL HANG TOUGH...LEAVING A GENERAL LIGHT SE-SW FLOW.  FOR
NOW...WILL BROAD BRUSH FRI-MON WITH NO PCPN TIMING AND TEMPS NEAR
CLIMO.

MARINE:  STILL QUIET THROUGH THE PERIOD...WITH AVG WINDS NO HIGHER
THAN 10 KT EXPECTED.

FIRE WX:  DITTO...WITH HOPEFULLY FEWER BRUSH FIRES AND MORE
WIDESPREAD RAIN SHOULD BEGIN TO DOUSE THEM.

PRELIM NUMBERS:
TPA TT 072/92/72/92 4454
FMY TT 071/92/71/92 5454

.TBW...NONE.

88/GOLDSMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 9:13 PM EDT	Severe Thunderstorm Warning	TBW	Hardee	32 min
Jun 18, 3:20 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough	40 min
Jun 18, 4:25 PM EDT	Severe Thunderstorm Warning	TBW	Lee	35 min
Jun 18, 5:02 PM EDT	Severe Thunderstorm Warning	TBW	Lee	28 min
Jun 18, 5:15 PM EDT	Severe Thunderstorm Warning	TBW	Pasco	45 min
Jun 18, 5:29 PM EDT	Severe Thunderstorm Warning	TBW	Charlotte, Lee	31 min
Jun 18, 6:11 PM EDT	Severe Thunderstorm Warning	TBW	Hardee	34 min
Jun 18, 6:35 PM EDT	Severe Thunderstorm Warning	TBW	Polk	40 min
Jun 18, 7:12 PM EDT	Severe Thunderstorm Warning	TBW	Polk	33 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; radar from the NEXRAD Level II archive.