Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 87, NWS Tampa Bay, FL

June 21, 2001Highlands County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jun 21, 2001, 3:55 PM EDT for Highlands County, Florida. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 21, 2001, 3:55 PM EDT (19:55 UTC)
Expired: Jun 21, 2001, 4:30 PM EDT
In force: 35 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

County Highlands County, FL

The radar

The Melbourne radar (KMLB), 109 km from the middle of the area, began a volume at 19:58 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.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 7.9 hours before the alert went out and 112 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: 1342 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 13 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 211957
SVRTBW

FLC055-212030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
355 PM EDT THU JUN 21 2001

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN HIGHLANDS COUNTY IN FLORIDA.

* UNTIL 430 PM EDT.

* AT 355 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL...7 MILES SOUTH OF SEBRING...
  MOVING NORTH AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  SEBRING.
  LAKE JOSEPHINE.
  AVON PARK.

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

DIME SIZE HAIL IS LIKELY. MOVE INDOORS IMMEDIATELY.

$$

LAT...LON 2734 8153 2733 8133 2762 8130 2762 8155

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 21, 2:13 PM EDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jun 21, 2:13 PM EDT, 1 hour 42 minutes before

WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
213 PM EDT THU JUN 21 2001

CURRENTLY: ALREADY HAD A STORM WITH GOLF BALL SIZE HAIL THIS
AFTERNOON OVER PINELLAS COUNTY. THIS USUALLY MEANS WE WILL SEE
ANOTHER SEVERE STORM OR TWO BEFORE THE DAY IS OVER. BEST CHANCE
WOULD SEEM TO BE OVER THE INTERIOR CENTRAL AND SOUTHERN COUNTIES
WHERE GULF BREEZE AND ATLANTIC BREEZE COMBINE. INSTABILITY IS
OBVIOUSLY IN PLACE.

FORECAST: 12Z MODELS ALL SHOW REASONABLY SIMILAR EVOLUTIONS TO THE
SYNOPTIC PATTERN THROUGH THE WEEKEND. DEEP UPPER TROF OVER THE
UPPER MIDWEST THIS AFTERNOON WILL CONTINUE TO AMPLIFY...PARKING
ITSELF AS A FULL LATITUDE TROF EXTENDING FROM EASTERN CANADA INTO
THE GULF BY SATURDAY. THE MAIN SURFACE RIDGE WILL RETREAT TO THE
SOUTH OF THE CWA IN RESPONSE...SETTING UP DEEP SOUTHWESTERLY FLOW
LOADED WITH TROPICAL MOISTURE.

MAIN QUESTION I AM LEFT WITH IS THE SOURCE AND LOCATION OF MAXIMUM
LIFT. DIURNAL CONSIDERATIONS WOULD ARGUE FOR MORNING THROUGH EARLY
AFTERNOON ACTIVITY IN COASTAL LOCATIONS WITH THE CONVECTION MOVING
INLAND DURING THE REMAINDER OF THE DAY. HOWEVER...STRONG VORT MAX
MAY SUPPLY ENOUGH SYNOPTIC LIFT TO KEEP THE THREAT OF THUNDERSTORMS
IN THE COASTAL COUNTIES ALL DAY. WILL STAY AWAY FROM SPECIFIC
TIMING IN THE COASTAL COUNTIES FOR THESE REASONS.

CHANCES OF RAIN ARE ALSO A BIT OF A QUESTION. THEY SHOULD BE GOOD...
BUT HOW GOOD. THERE IS A WEAK SURFACE TROF EVIDENT IN THE SURFACE
WIND FIELDS OVER APALACHEE BAY THIS AFTERNOON...AND LEADING VORT
MAX LIFTING NORTHEAST WILL HELP TO SUPPRESS THE TROF A LITTLE
FARTHER TO THE SOUTH. THE EVENTUAL RESTING PLACE OF THAT BOUNDARY
WILL BE THE LOCATION OF THE BEST CHANCES FOR RAIN...AND LOCALLY
HEAVY RAIN AT THAT. WITH THOSE DETAILS HARD TO DISCERN AT THIS
TIME...I WILL BROADBRUSH THE FORECAST AND GO WITH SCATTERED ON
FRIDAY AND NUMEROUS ON SATURDAY AS THE MAIN TROF APPROACHES.
HOPEFULLY FUTURE MODEL RUNS WILL ALLOW FOR MORE DETAIL IN THE ZONES.

MARINE: STILL NO HEADLINES EXPECTED WITH WINDS BECOMING SOUTHWEST
EVERYWHERE FOR THE WEEKEND.

EXTENDED: FLOW SHOULD TRANSITION BACK AGAIN TO A SOUTHEASTMERLY LOW
LEVEL FLOW FOR MOST OF NEXT WEEK...GIVING LATE DAY SHOWERS AND
THUNDERSTORMS BACK TO THE COASTAL COUNTIES.

PRELIM NUMBERS:
TPA 74/90/77/89 3546
FMY 73/92/75/91 4536

.TBW...NONE.

ALSHEIMER

In the hours before

Local storm report, Jun 21, 2:23 PM EDT, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
223 PM EDT THU JUN 21 2001

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0114 PM    PINELLAS PARK             FL   .75 INCH HAIL
06/21/01   PINELLAS                       REPORTED BY BAY NEWS 9.
                                          EVENT DURATION 15
                                          MINUTES.

0114 PM    PINELLAS PARK             FL   1 INCH HAIL
06/21/01   PINELLAS                       REPORTED BY PUBLIC.

0116 PM    PINELLAS PARK             FL   LIGHTNING
06/21/01   PINELLAS                       A 32 YEAR OLD FEMALE
                                          WAS STRUCK BY LIGHTNING
                                          WHILE GRABBING A METAL
                                          CLOSET DOOR KNOB INSIDE
                                          HER HOME. SHE IS
                                          CURRENTLY IN GOOD
                                          CONDITION.  REPORTED BY
                                          BAY NEWS 9.

0120 PM    PINELLAS PARK             FL   WIND DAMAGE
06/21/01   PINELLAS                       TREES WERE DOWNED ON
                                          66TH AND 118TH ST IN
                                          PINELLAS PARK. REPORTED
                                          BY BAY NuEWS 9.

0125 PM    PINELLAS PARK             FL   FUNNEL CLOUD
06/21/01   PINELLAS                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 1:04 PM EDT	Severe Thunderstorm Warning	TBW	Pinellas	31 min
Jun 21, 2:59 PM EDT	Severe Thunderstorm Warning	TBW	Citrus	31 min
Jun 21, 3:16 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough	29 min
Jun 21, 4:38 PM EDT	Severe Thunderstorm Warning	TBW	Pasco	52 min
Jun 21, 5:34 PM EDT	Severe Thunderstorm Warning	TBW	Pasco	41 min
Jun 21, 6:06 PM EDT	Severe Thunderstorm Warning	TBW	Polk	39 min
Jun 21, 6:42 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.