Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 18, NWS Tampa Bay, FL

April 5, 2008Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 5, 2008, 5:30 PM EDT for Polk County, Florida. It was in force for 30 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
Apr 5, 2008, 5:30 PM EDT (21:30 UTC)
Expired
Apr 5, 2008, 6:00 PM EDT
In force
30 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon

County Polk County, FL

The radar

The Tampa radar (KTBW), 74 km from the middle of the area, began a volume at 21:34 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.5 hours before the alert went out and 131 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, Cape Canaveral, FL at 12:00Z on 2008-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Cape Canaveral, FL at 12:00Z on 2008-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1349 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Apr 5, 1:45 PM EDT, 3 hours 45 minutes earlier.

Area forecast discussion, Apr 5, 1:45 PM EDT, 3 hours 45 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
145 PM EDT SAT APR 5 2008

.SHORT TERM (TONIGHT - MONDAY)...LARGE AREA OF SHOWERS AND
THUNDERSTORMS OVER THE NORTH CENTRAL GULF OF MEXICO AND SOUTHEAST
U.S. AHEAD OF A COLD FRONT WILL PUSH EAST OVER THE NORTHERN AND
CENTRAL FORECAST AREA TONIGHT.  THE FRONT WILL BECOME STATIONARY
ACROSS NORTH FLORIDA ON SUNDAY WITH NUMEROUS SHOWERS AND
THUNDERSTORMS ACROSS WEST CENTRAL FLORIDA IN THE DEEP TROPICAL
MOISTURE SOUTH OF THE BOUNDARY.  A FEW STORMS WILL BE STRONG WITH
STRONG WINDS...SMALL HAIL...AND VERY HEAVY RAIN.  SCATTERED SHOWERS
AND THUNDERSTORMS WILL PERSIST INTO SUNDAY NIGHT...DECREASING IN
AREAL COVERAGE ON MONDAY AS SURFACE HIGH PRESSURE OVER THE MID
ATLANTIC BEGINS TO BUILD SOUTH AND PUSHES THE FRONT SOUTH OF THE
AREA.  DRY STABLE AIR WILL ADVECT OVER WEST CENTRAL FLORIDA

&&

.LONG TERM (MONDAY NIGHT - SATURDAY)...LATEST GFS/DGEX ARE SHOWING
BETTER AGREEMENT REGARDING THE STALLED FRONTAL BOUNDARY NORTH OF THE
STATE MONDAY NIGHT AND TUESDAY WITH BOTH SOLUTIONS SHOWING A MUCH
WEAKER SYSTEM ALONG WITH LOWER POPS FOR THE AREA. HOWEVER...THERE
SHOULD BE ENOUGH LOW LEVEL MOISTURE LINGERING AROUND THE AREA IN
ORDER TO GENERATE SOME SHOWERS AND PM THUNDERSTORMS AS DAYTIME
HEATING TAKES PLACE. WILL KEEP 20/30 POPS FROM NORTH TO SOUTH FOR
TUESDAY AFTERNOON...THEN ISOLATED 20 PERCENT THROUGH THURSDAY
AFTERNOON. GFS HAS ALSO MOVED THE FORMATION OF A SYNOPTIC LOW
FURTHER TO THE NORTHEAST OF FLORIDA ON MONDAY EVENING WHICH IS NOW
ACTUALLY CONTRIBUTING TO A FASTER DRYING TREND BY ADVECTING A DRIER
AIRMASS FROM THE NORTH. FRIDAY LOOKS FAIRLY DRY. ANOTHER FRONTAL
BOUNDARY IS DEPICTED BY THE MODELS APPROACHING FLORIDA BY SATURDAY
MORNING...BUT WILL WAIT FOR MORE MODEL PERSISTENCE BEFORE
INCORPORATING ANY KIND OF SIGNIFICANT WEATHER FOR NEXT WEEKEND.

WITH RAIN AND LOW LEVEL MOISTURE DOMINATING MOST OF THE LONG TERM
EXPECT TEMPERATURES TO REMAIN SEVERAL DEGREES ABOVE NORMALS.

&&

.AVIATION...SCATTERED TO BROKEN LAYERS OF LOW LEVEL CU AROUND 1500
FEET WILL CONTINUE THROUGH THE AFTERNOON AND EVENING HOURS ALONG
WITH SHOWERS AND THUNDERSTORM ACTIVITY LATER TODAY. WINDS WILL ALSO
BECOMING BREEZY AND GUSTY THROUGH THE EARLY EVENING HOURS.
GENERALLY...EXPECT EXTENDED PERIODS OF MVFR TO PREVAIL THROUGH
SUNDAY MORNING WITH CEILINGS IN THE 1000-2000 FEET RANGE ALONG WITH
BRIEF PERIODS OF IFR CIGS/VIS ACCOMPANYING THE STRONGEST STORMS.

&&

.MARINE...EXERCISE CAUTION CONDITIONS UNTIL AROUND MIDNIGHT.  WINDS
AND SEAS WILL GRADUALLY DECREASE LATE TONIGHT.  NUMEROUS SHOWERS AND
THUNDERSTORMS TONIGHT AND SUNDAY...ESPECIALLY OVER THE NORTHERN AND
CENTRAL WATERS.  HIGH PRESSURE WILL BUILD OVER THE WATERS MONDAY AND
HOLD THROUGH MIDWEEK WITH DRIER AIR ADVECTING OVER THE AREA.

&&

.FIRE WEATHER...HUMIDITY VALUES WILL REMAIN ABOVE CRITICAL LEVELS
THROUGH THE WEEKEND WITH NO FIRE WEATHER ISSUES EXPECTED.

&&

.PRELIMINARY POINT TEMPS/POPS...
TPA  69  80  69  81 /  60  70  60  30
FMY  70  83  69  83 /  30  50  40  30
GIF  69  82  66  82 /  50  70  60  30
SRQ  70  81  69  82 /  50  50  40  30
BKV  67  80  65  81 /  60  70  60  30
SPG  70  79  70  79 /  60  70  60  30

&&

.TBW WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GULF WATERS...SMALL CRAFT EXERCISE CAUTION THROUGH 11 PM
              TONIGHT FROM BONITA BEACH TO SUWANNEE RIVER OUT 60 NM
              INCLUDING TAMPA BAY.

&&

SHORT TERM/MARINE/FIRE WEATHER...EO
LONG TERM/AVIATION...AR
Hazardous weather outlook, Apr 5, 4:17 AM EDT, 13 hours 13 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
417 AM EDT SAT APR 5 2008

FLZ039-042-043-048>052-055>057-060>062-065-052300-
LEVY-CITRUS-SUMTER-HERNANDO-PASCO-PINELLAS-HILLSBOROUGH-POLK-
MANATEE-HARDEE-HIGHLANDS-SARASOTA-DE SOTO-CHARLOTTE-LEE-
417 AM EDT SAT APR 5 2008

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

.DAY ONE...TODAY AND TONIGHT.

...A FEW STRONG TO SEVERE THUNDERSTORMS POSSIBLE OVER CENTRAL AND
EASTERN LOCATIONS THIS AFTERNOON AND EVENING...

THUNDERSTORM IMPACT...DEEP MOISTURE WILL OVERSPREAD THE AREA TODAY
AS SOUTHWEST FLOW INCREASES AHEAD OF A COLD FRONT. THIS MOISTURE WILL
COMBINE WITH STRONG SURFACE HEATING AND A NEARBY TROUGH TO CREATE
THUNDERSTORMS OVER MOST OF THE AREA. THE BEST CHANCE FOR THUNDERSTORMS WILL
EXIST OVER EASTERN INTERIOR LOCATIONS FROM SUMTER SOUTHWARD THROUGH DESOTO
COUNTY AND AREAS TO THE EAST. SOME STORMS MAY BECOME STRONG WITH GUSTY WINDS
40 MPH. THE MAJORITY OF STORMS THAT DEVELOP WILL PRODUCE VERY HEAVY
RAINFALL...SMALL HAIL...AND GUSTY WINDS. CONVECTION WILL FAVOR THE AFTERNOON
AND EVENING HOURS.

WIND AND WAVES IMPACT...SOUTH WINDS OF 15 TO 20 KNOTS WILL IMPACT
ALL WATERS TODAY. LOCAL GUSTS TO 25 OR MORE KNOTS WILL BE POSSIBLE
IN AREAS CLOSE TO THE COAST AND IN TAMPA BAY DURING THE AFTERNOON
AND EARLY EVENING. CONDITIONS WILL BE CHOPPY...AND SMALL CRAFT
SHOULD EXERCISE CAUTION.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

SHOWER AND THUNDERSTORM ACTIVITY WILL CONTINUE THROUGH MID WEEK AS
A FRONT REMAINS STALLED OVER CENTRAL AND SOUTHERN FLORIDA.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD MONITOR THE WEATHER AND SELF ACTIVATE IF NEEDED.
PLEASE PHONE IN REPORTS OF STRONG TO SEVERE THUNDERSTORMS TO THE
NWS OFFICE IN RUSKIN USING THE SPOTTER-LINE.

CANTIN

In the hours before

Special weather statement, Apr 5, 4:35 PM EDT, 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
435 PM EDT SAT APR 5 2008

FLZ052-052100-
POLK-
435 PM EDT SAT APR 5 2008

...STRONG THUNDERSTORMS WILL AFFECT SOUTHERN POLK COUNTY...

A THUNDERSTORM...MOVING NORTH AT 20 MPH...WILL AFFECT RURAL SOUTHERN
POLK COUNTY AND LAKE WALES...UNTIL 500 PM EDT. GUSTY WINDS 40 TO 50
MPH MAY CAUSE LOOSE OBJECTS TO BLOW AROUND. MINOR DAMAGE TO TREE
LIMBS AND WIRES IS POSSIBLE. FREQUENT CLOUD TO GROUND LIGHTNING IS
EXPECTED. IF CAUGHT OUTSIDE...CROUCH DOWN IN A LOW SPOT...AWAY FROM
TALL OBJECTS. HAIL UP TO ONE HALF INCH IN DIAMETER IS EXPECTED.
TORRENTIAL RAINS WILL CAUSE PONDING OF WATER ON ROADS...AND MINOR
FLOODING OF POOR DRAINAGE AREAS.
&&
WHEN DRIVING THROUGH HEAVY RAIN...SLOW DOWN. ALWAYS LEAVE A SAFE
DISTANCE BETWEEN YOU AND OTHER VEHICLES. WHEN USING WIPERS...TURN ON
HEADLIGHTS. AVOID DRIVING THROUGH PUDDLES THAT COULD HIDE POTHOLES OR
CAUSE HYDROPLANING. MAKE SURE YOUR HEADLAMPS...TIRES...AND WIPERS ARE
IN GOOD CONDITION. KEEP AN EMERGENCY KIT WHICH INCLUDES A
FLASHLIGHT...FLARES...AND SIMPLE HAND TOOLS.

SEVEN THOUSAND PEOPLE DIE IN WEATHER RELATED AUTOMOBILE ACCIDENTS
EACH YEAR... MANY DUE TO POOR VISIBILITY AND WET ROADS.

REMEMBER: VISIBILITY AND TRACTION LEAVE TIME FOR REACTION

JLC
Local storm report, Apr 5, 5:20 PM EDT, 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 5, 4:48 PM EDTSevere Thunderstorm WarningTBWPolk27 min
Apr 5, 6:01 PM EDTSpecial Marine WarningTBW59 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; radar from the NEXRAD Level II archive.