Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 83, NWS Tampa Bay, FL

June 20, 2001Lee County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jun 20, 2001, 5:08 PM EDT for Lee 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 counties it named.

The facts

Issued: Jun 20, 2001, 5:08 PM EDT (21:08 UTC)
Expired: Jun 20, 2001, 5:45 PM EDT
In force: 37 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

County Lee County, FL

The radar

The Tampa radar (KTBW), 132 km from the middle of the area, began a volume at 21:09 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, 9.1 hours before the alert went out and 132 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: 636 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 10 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 202108
SVRTBW
FLC071-202145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
508 PM EDT WED JUN 20 2001

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LEE COUNTY IN FLORIDA.

* UNTIL 545 PM EDT.

* AT 508 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS...5 MILES   
  EAST OF BONITA SPRINGS...MOVING SLOWLY WEST.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  BONITA SPRINGS.

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

$$

LAT...LON 2634 8185 2632 8166 2643 8166 2646 8160
          2655 8165 2655 8203

25
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 20, 1:41 PM EDT, 3 hours 27 minutes earlier.

Area forecast discussion, Jun 20, 1:41 PM EDT, 3 hours 27 minutes before

WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
141 PM EDT WED JUN 20 2001

CURRENTLY: SLOWER START TO CONVECTION AS PLANNED. EXCEPT FOR A
COUPLE OF THUNDERSHOWERS IN DESOTO COUNTY ALL THINGS ARE QUIET SO
FAR. LATE AFTERNOON AND EVENING BOUNDARY COLLISION SHOULD LIGHT
THINGS UP...HOWEVER.

FORECAST: 12Z MODELS STILL SUPPORTING THE SAME GENERAL TREND THAT
HAS BEEN ADVERTISED. THURSDAY WILL BE A TRANSITION DAY AS THE SURFACE
RIDGE SLIDES INTO THE SOUTH CENTRAL FA BY LATE IN THE DAY.
CONVECTION WILL BE A LITTLE EARLIER NORTH OF TAMPA BAY THURSDAY
WITH SOME MORNING ACTIVITY POSSIBLE COMING IN OFF THE GULF.
CONVECTION WILL STILL GENERALLY BE IN THE AFTERNOON ALONG THE
SOUTHWEST COAST CLOSER TO THE RIDGE AXIS. BY FRIDAY AFTERNOON RIDGE
WILL HAVE MOVED SOUTH OF THE AREA AS UPPER LEVEL TROF DEEPENS
OVER THE EASTERN U.S. AND A WEAK COLD FRONT STARTS MOVING INTO THE
PANHANDLE. THIS WILL GIVE SOUTHWESTERLY FLOW TO ALL AREAS LATER
FRIDAY WITH THE BEST CHANCE FOR AFTERNOON CONVECTION OVER THE
INTERIOR PORTIONS OF THE CWA. CLIMO TEMPS EXPECTED THURSDAY...THEN
WARMER NIGHTS ALONG THE COAST BY FRIDAY WITH THE ONSHORE FLOW.
PLENTY OF MOISTURE TO SUPPORT SCATTERED THUNDERSTORMS.

MARINE: NO HEADLINES NEEDED. WINDS WILL SHIFT TO MORE SOUTHWESTERLY
BY FRIDAY AND CONTINUE INTO THE WEEKEND.

EXTENDED: SOUTHWESTERLY LOW LEVEL FLOW EXPECTED TO CONTINUE THROUGH
SUNDAY...THEN SHIFT BACK TO SOUTHEASTERLY BY EARLY NEXT WEEK AS
SURFACE RIDGE SLIDES BACK NORTHWARD. AVN SHOWS A PRETTY STRONG VORT
MAX FOR THIS TIME OF YEAR ROUNDING THE UPPER TROF AND PASSING
OVERHEAD ON SATURDAY...WHICH SUPPORTS NUMEROUS THUNDERSTORMS IN
FORECAST.

PRELIM NUMBERS:
TPA 73/92/75/91 4545
FMY 73/92/73/92 4545

.TBW...NONE.

ALSHEIMER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 3:53 PM EDT	Severe Thunderstorm Warning	TBW	Charlotte	37 min
Jun 20, 4:00 PM EDT	Severe Thunderstorm Warning	TBW	Sarasota	45 min
Jun 20, 4:23 PM EDT	Tornado Warning	TBW	Sarasota	37 min
Jun 20, 5:25 PM EDT	Tornado Warning	TBW	Manatee	35 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.