Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 48, NWS Tampa Bay, FL

June 21, 2008Hillsborough County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jun 21, 2008, 10:48 AM EDT for Hillsborough County, Florida. It was in force for 27 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, 2008, 10:48 AM EDT (14:48 UTC)
Expired
Jun 21, 2008, 11:15 AM EDT
In force
27 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon

County Hillsborough County, FL

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 2.8 hours before the alert went out and 23 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-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2008-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2426 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2008-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2426 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
740 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

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, 9:43 AM EDT, 1 hour 5 minutes earlier.

Area forecast discussion, Jun 21, 9:43 AM EDT, 1 hour 5 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
943 AM EDT SAT JUN 21 2008

.DISCUSSION...DEEP MOISTURE HAS OVERSPREAD THE REGION AND AS IS
TYPICAL WITH AN AREA OF DEEP MOISTURE...WITH PRECIPITABLE WATER OVER
2 INCHES...PLENTY OF MID CLOUDS HAVE SPREAD ACROSS MOST OF THE
REGION. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS HAVE BEGUN
TO DEVELOP OVER THE EASTERN GULF AS THE SHORT WAVE MOVING ACROSS THE
SOUTHEAST U.S. APPROACHES.  THIS TREND SHOULD CONTINUE THROUGH THE
AFTERNOON ACROSS THE NORTHERN HALF OF THE AREA WITH THE CONVECTION
PUSHING MORE INLAND AS THE AFTERNOON PROGRESSES OVER THE SOUTHERN
HALF.  TEMPERATURES ARE STRUGGLING AND HAVE ADJUSTED FORECAST MAXES
DOWN SLIGHTLY IN GRIDS.  HAVE ALSO RAISED POPS TO 70 PERCENT ACROSS
THE NATURE COAST AND LEFT THE 60 PERCENT ELSEWHERE.  OVERALL PRESENT
GRIDS LOOK ON TRACK WITH NO OTHER UPDATES EXPECTED FOR THIS MORNING.

&&

.AVIATION...SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE
EXPECTED THROUGH MID-AFTERNOON AT THE TERMINAL SITES CAUSING SOME
MVFR/LOCAL IFR CONDITIONS.  OTHERWISE...VFR CONDITIONS ARE EXPECTED
THROUGH TONIGHT.

&&

.MARINE...FAVORABLE CONDITIONS FOR WATERSPOUTS WILL CONTINUE THIS
MORNING AS SURFACE FLOW IS PRETTY LIGHT OUT OF THE SOUTH TO
SOUTHWEST WITH WESTERLY FLOW JUST ABOVE AND HAVE HIGHLIGHTED THIS
POSSIBILITY IN A MARINE WEATHER STATEMENT. OTHERWISE...WEST TO
SOUTHWEST WINDS WILL CONTINUE AROUND 10 KNOTS OR LESS TODAY WITH
HIGHER WINDS AND SEAS POSSIBLE IN AND NEAR THUNDERSTORMS.

&&

.TBW WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GULF WATERS...NONE.
&&

PRC/JC
Hazardous weather outlook, Jun 21, 3:30 AM EDT, 7 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
330 AM EDT SAT JUN 21 2008

FLZ039-042-043-048>052-055>057-060>062-065-212130-
LEVY-CITRUS-SUMTER-HERNANDO-PASCO-PINELLAS-HILLSBOROUGH-POLK-
MANATEE-HARDEE-HIGHLANDS-SARASOTA-DE SOTO-CHARLOTTE-LEE-
330 AM EDT SAT JUN 21 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST CENTRAL AND SOUTHWEST
FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

...THUNDERSTORM IMPACT...
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS THIS MORNING WILL
BECOME MORE NUMEROUS THROUGH THE DAY...AS ACTIVITY INITIALLY ALONG
THE COAST MOVES NORTH AND INLAND. IN ADDITION TO FREQUENT LIGHTNING...
ANY THUNDERSTORMS WILL BE CAPABLE OF PRODUCING GUSTY WINDS AND HEAVY
RAIN. MOTORISTS SHOULD USE CAUTION WHEN DRIVING THROUGH AREAS OF
RAIN.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

...THUNDERSTORM IMPACT...
SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE EACH DAY. IN
ADDITION TO LIGHTNING...THE THUNDERSTORMS MAY PRODUCE GUSTY WINDS
AND HEAVY RAIN. MOTORISTS SHOULD USE CAUTION WHEN DRIVING THROUGH
AREAS OF RAIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

17

In the hours before

Local storm report, Jun 21, 8:41 AM EDT, 2 hours 7 minutes before
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Local storm report, Jun 21, 8:57 AM EDT, 1 hour 51 minutes before
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Special weather statement, Jun 21, 10:07 AM EDT, 41 minutes before
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Local storm report, Jun 21, 10:33 AM EDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1033 AM EDT SAT JUN 21 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1016 AM     WATER SPOUT      6 SE SANIBEL            26.38N 82.03W
06/21/2008                   GMZ856             FL   BROADCAST MEDIA

            TWO WATER SPOUTS WERE REPORTED OFF OF SANIBEL.

1028 AM     HAIL             4 N TOWN N COUNTRY    28.07N 82.59W
06/21/2008  E0.88 INCH       HILLSBOROUGH       FL   PUBLIC

            NICKEL SIZED HAIL WAS REPORTED NEAR THE CITRUS PARK MALL.

&&

COLSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 9:01 AM EDTSpecial Marine WarningTBW29 min
Jun 21, 10:18 AM EDTSpecial Marine WarningTBW27 min
Jun 21, 10:21 AM EDTSevere Thunderstorm WarningTBWHillsborough24 min
Jun 21, 10:39 AM EDTSpecial Marine WarningTBW66 min
Jun 21, 12:35 PM EDTSevere Thunderstorm WarningTBWPolk40 min
Jun 21, 1:15 PM EDTSevere Thunderstorm WarningTBWPolk30 min
Jun 21, 1:36 PM EDTAreal Flood AdvisoryTBWManatee, Sarasota54 min
Jun 21, 4:47 PM EDTSpecial Marine WarningTBW28 min

Nearby

Severe Thunderstorm Warnings in Florida, 2008Every severe thunderstorm warning in 2008

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.