Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 68, NWS Tampa Bay, FL

August 12, 2000Hillsborough County, Manatee County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Aug 12, 2000, 4:55 AM EDT for Hillsborough County, Manatee County, Florida. It was in force for 35 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: Aug 12, 2000, 4:55 AM EDT (08:55 UTC)
Expired: Aug 12, 2000, 5:30 AM EDT
In force: 35 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

Counties Hillsborough County, FL, Manatee County, FL

What was reported inside it

Time	Report	Where	Remark
Aug 12, 5:15 AM EDT	Thunderstorm Wind	Ruskin, FL	The Tampa Electric Company reported that thunderstorm winds downed a few trees, several branches and power lines in Ruskin.

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 00:00Z, 8.9 hours before the alert went out and 5 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: 974 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1196 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: -2 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 120856
SVRTBW
FLC057-081-120930-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
455 AM EDT SAT AUG 12 2000

THE NATIONAL WEATHER SERVICE IN RUSKIN FLORIDA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MANATEE COUNTY.
  SOUTHERN HILLSBOROUGH COUNTY.

* UNTIL 530 AM EDT.

* AT 455 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH DAMAGING WINDS...OVER SOUTHERN            
  HILLSBOROUGH COUNTY NEAR SUN CITY CENTER...MOVING EAST             
  SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  WIMAUMA BY 505 AM EDT.
  DUETTE BY 530 AM EDT.

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

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

$$

LAT...LON 2778 8246 2761 8250 2750 8211 2772 8205

13
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 Aug 12, 2:30 AM EDT, 2 hours 25 minutes earlier.

Area forecast discussion, Aug 12, 2:30 AM EDT, 2 hours 25 minutes before

WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
230 AM EDT SAT AUG 12 2000

THUNDERSTORMS ARE DEVELOPING RIGHT ON QUE...GENERALLY FROM
CLEARWATER NORTHWARD BUT THIS SHOULD SINK SOUTH DURING THE MORNING.
THE QUESTION IS HOW MUCH TRAINING AND WHAT KIND STORM TOTAL PRECIP
AMOUNTS WE WILL GET.  THE BIG QUESTION IS WILL THE FLOOD WATCH NEED
TO BE EXTENDED SOUTHWARD FOR SUNDAY.

THE 500 MB TROUGH IS STILL DIGGING TO OUR WEST...IT WILL STOP
DIGGING DURING THE DAY TODAY BUT THE TROUGH AXIS WILL STAY TO OUR
WEST THROUGH SUNDAY AM.  ABSOLUTE VORTICITY IS INCREASING SATURDAY
NIGHT/SUNDAY MORNING...500 MB HEIGHT DROP SLIGHTLY.  THE AXIS OF
DEEPEST MOISTURE WILL BE OVER SOUTHERN COUNTIES ON SUNDAY SO THE
EMPHASIS WILL BE THERE.  WE DO SEEM TO HAVE BOTH SPEED DIVERGENCE
AND DIFLUENCE ALOFT...HENCE A BULLSEYE OF TOTAL DIVERGENCE JUST
OFFSHORE MANATEE AND PINELLAS SUNDAY MORNING. I WILL THEREFORE GO
AHEAD AND EXTEND THE WATCH SOUTHWARD FOR SUNDAY AM FROM THE
PINELLAS/PASCO LINE SOUTHWARD...BUT NOT INCLUDE POLK AND HIGHLANDS
COUNTIES.

TODAYS AVN LOOKS VERY SIMILAR TO YESTERDAYS MRF...AND THE AVN HAS
BEEN DOING THE BEST THE LAST COUPLE RUNS SO I WILL GO WITH
PERSISTENCE ON THE EXTENDED FORECAST.

MARINE...WINDS ARE FUNNELING THROUGH THE NORTHERN COASTAL WATERS SO
I WILL GO WITH A SCEC NORTH OF TARPON SPRINGS.  TO THE SOUTH AS YOU
GET CLOSER TO THE RIDGE AXIS WINDS WILL BE A LITTLE LIGHTER.

PRELIMINARY NUMBERS

TPA TT 087/079 088/078 088 9652
FMY TT 089/078 088/077 089 8794

.TBW...FLOOD WATCH SATURDAY LEVY...CITRUS...HERNANDO...PASCO...
    PINELLAS...HILLSBOROUGH...MANATEE. FLZ039-042-048>051-055.

    FLOOD WATCH SUNDAY PINELLAS...HILLSBOROUGH...MANATEE...HARDEE
    ...SARASOTA...DESOTO...CHARLOTTE...LEE. FLZ050-051-055-056-
    060>062-065.

    SCEC TARPON SPRINGS TO SUWANNEE RV. GMZ850-870.

SOBIEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 2:38 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough	37 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.