Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 111, NWS Tampa Bay, FL

November 30, 2008Levy County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Nov 30, 2008, 11:30 AM EST for Levy 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
Nov 30, 2008, 11:30 AM EST (16:30 UTC)
Expired
Nov 30, 2008, 12:00 PM EST
In force
30 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon

County Levy County, FL

The radar

The Jacksonville radar (KJAX), 170 km from the middle of the area, began a volume at 16:31 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Nov 30, 9:51 AM ESTTornado WatchSPC7 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 4.5 hours before the alert went out and 171 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, Jacksonville, FL at 12:00Z on 2008-11-30Temperature 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, Jacksonville, FL at 12:00Z on 2008-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 288 square meters per square second.1939587897117Sfc1 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
996 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
288 m²/s²
0-3 km storm-relative helicity
318 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Nov 30, 9:56 AM EST, 1 hour 34 minutes earlier.

Area forecast discussion, Nov 30, 9:56 AM EST, 1 hour 34 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
956 AM EST SUN NOV 30 2008

.UPDATE...TORNADO WATCH NUMBER 939 IS IN EFFECT UNTIL 500 PM ACROSS
PARTS OF WEST CENTRAL FL AND THE NEAR SHORE COASTAL WATERS.

&&

.PREV DISCUSSION... /ISSUED 839 AM EST SUN NOV 30 2008/

..SOME BENEFICIAL RAIN AND STRONG TO SEVERE STORMS POSSIBLE TODAY...

DISCUSSION...COLD FRONT ALONG FL/AL BORDER SOUTHWARD WITH AN
ADVANCE SQUALL LINE FROM PERRY SW OVER THE GULF AT 800 AM. THE CWA
IS STILL PARTLY CLOUDY FOR THE MOST PART WITH A FEW SHOWERS NEAR
FORT MYERS AND ROBUST SOUTH WINDS OVER THE ENTIRE AREA. THESE HAVE
PROMPTED A LAKE WIND ADVISORY TODAY. IN ADDITION THE OFFSHORE BUOY
IS REPORTING WAVES OF 10 FT. WILL ISSUE HIGH SURF ADVISORY FOR THE
COAST THIS MORNING AND AFTERNOON. LEADING EDGE OF SQUALL LINE
EXPECTED TO REACH LEVY COUNTY 11-NOON TODAY...IN LINE WITH
FORECASTS AND GRIDS...AND THEN CONTINUE DOWN THE CWA. WILL UPDATE
THE FORECASTS BY 900 AM BUT ONLY TO INCLUDE THE HIGH SURF.

AVIATION...GUSTY SOUTHWEST WINDS DEVELOPING THIS MORNING AHEAD OF
A RAPIDLY APPROACHING COLD FRONT. LINE OF STRONG TO SEVERE
THUNDERSTORMS WILL PUSH ACROSS TERMINALS IN THE TAMPA AREA EARLY
TO MID AFTERNOON AND THE FORT MYERS TERMINALS LATE THIS AFTERNOON.
WIND GUSTS OF 40 TO 50 KTS POSSIBLE WITH THE STRONGER STORMS.
PERIOD OF LIGHT TO MODERATE RAIN WITH MVFR CIGS/VSBYS WILL PERSIST
FOR A COUPLE HOURS AFTER THE LEADING LINE OF THUNDERSTORMS PUSHES
THROUGH. MVFR/VFR CIGS WILL PERSIST THROUGH THE NIGHT.

MARINE...SOUTH WINDS EARLY MORNING WILL SHIFT TO SW DURING THE
DAY. WITH SPEEDS OF 20 KT OR HIGHER WITH SOME GUSTS TO GALE FORCE
ON THE GULF A SMALL CRAFT ADVISORY CONTINUES. WINDS SHIFT TO WEST
AND REMAIN IN ADVISORY LEVELS TONIGHT AFTER THE FRONT MOVES THROUGH.
A BUOY BEYOND THE COAST WATERS HAS BEEN BEEN REPORTING WAVES OF 10
FEET AND THESE WILL BE MOVING INTO THE WATERS THIS AFTERNOON AND
PERSIST INTO MON. NEXT FORECAST OUT AROUND 10 AM WITH LITTLE CHANGE.

&&

.PRELIMINARY POINT TEMPS/POPS...
TPA  74  58  68  48 /  80  50  30  20
FMY  78  62  71  52 /  60  60  30  20
GIF  78  57  69  48 /  80  50  30  20
SRQ  74  59  68  48 /  80  50  30  20
BKV  72  51  66  41 /  80  50  30  20
SPG  75  60  69  53 /  80  50  30  20

&&

.TBW WATCHES/WARNINGS/ADVISORIES...
FL...LAKE WIND ADVISORY UNTIL 6 PM EST THIS AFTERNOON FOR CHARLOTTE-
     CITRUS-DE SOTO-HARDEE-HERNANDO-HIGHLANDS-HILLSBOROUGH-LEE-
     LEVY-MANATEE-PASCO-PINELLAS-POLK-SARASOTA-SUMTER.

     HIGH SURF ADVISORY UNTIL 6 PM EST THIS AFTERNOON FOR CHARLOTTE-
     CITRUS-HERNANDO-HILLSBOROUGH-LEE-LEVY-MANATEE-PASCO-
     PINELLAS-SARASOTA.

GULF WATERS...SMALL CRAFT ADVISORY UNTIL 4 PM EST MONDAY FOR BONITA BEACH TO
     ENGLEWOOD OUT 20 NM-BONITA BEACH TO ENGLEWOOD OUT 20 TO 60
     NM-ENGLEWOOD TO TARPON SPRINGS OUT 20 NM-ENGLEWOOD TO
     TARPON SPRINGS OUT 20 TO 60 NM-TAMPA BAY WATERS-TARPON
     SPRINGS TO SUWANNEE RIVER OUT 20 NM-TARPON SPRINGS TO
     SUWANNEE RIVER OUT 20 TO 60 NM.

&&

SHORT TERM/MARINE....09/RUDE
LONG TERM/AVIATION...13/OGLESBY
Hazardous weather outlook, Nov 30, 4:34 AM EST, 6 hours 56 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
434 AM EST SUN NOV 30 2008

FLZ039-042-043-048>052-055>057-060>062-065-301530-
LEVY-CITRUS-SUMTER-HERNANDO-PASCO-PINELLAS-HILLSBOROUGH-POLK-
MANATEE-HARDEE-HIGHLANDS-SARASOTA-DE SOTO-CHARLOTTE-LEE-
434 AM EST SUN NOV 30 2008

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

...STRONG TO SEVERE STORMS POSSIBLE TODAY...

.DAY ONE...TODAY AND TONIGHT.

...THUNDERSTORM IMPACT...
A DEVELOPING STORM SYSTEM OVER THE SOUTHEASTERN STATES EARLY THIS
MORNING WILL MOVE UP ALONG THE MID ATLANTIC COAST TONIGHT AND MONDAY.
A TRAILING COLD FRONT FROM THIS STORM SYSTEM WILL MOVE INTO THE
EASTERN GULF WATERS LATER THIS MORNING THEN ACROSS WEST CENTRAL AND
SOUTHWEST FLORIDA THIS AFTERNOON AND TONIGHT. INCREASING LOW LEVEL
MOISTURE ALONG AND AHEAD OF THE FRONT WILL INCREASE CHANCES FOR
SHOWERS AND STORMS AS THE FRONT MOVES THROUGH THE REGION. INCREASING
LOW AND MID LEVEL WIND FIELDS ALONG WITH HIGH DEEP LAYERED SHEAR VALUES
AHEAD OF THE FRONT SUGGEST THE POTENTIAL FOR SOME STRONG TO SEVERE
STORMS WITH DAMAGING WINDS...ISOLATED TORNADOES...AND MARINE WATERSPOUTS
ACROSS THE REGION TODAY.

STORMS WILL RACE TO THE EAST AND NORTHEAST AT 40 TO 50 MPH TODAY AND
WILL ALSO BE CAPABLE OF PRODUCING BRIEF LOCALLY HEAVY RAINS AND OCCASIONAL
LIGHTNING STRIKES. RESIDENT AND VISITORS OF WEST CENTRAL AND SOUTHWEST
FLORIDA SHOULD KEEP AN EYE TO THE SKY TODAY. IF THREATENING WEATHER
APPROACHES YOUR LOCATION...MOVE INDOORS IMMEDIATELY.

...WIND AND SEA IMPACT...
SOUTHWEST WINDS WILL INCREASE INTO THE 20 TO 25 KNOT RANGE WITH
GUSTS TO GALE UP TO FORCE OVER THE ADJACENT GULF WATERS TODAY THROUGH
MONDAY. THESE INCREASING WINDS WILL HELP TO BUILD SEAS WHICH WILL
BRING HAZARDOUS BOATING AND SURF CONDITIONS TO ALL OF THE GULF WATERS
INCLUDING TAMPA BAY THROUGH MONDAY AS A STRONG COLD FRONT SWEEPS THROUGH
THE REGION AND SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR ALL WATERS
THROUGH MONDAY AFTERNOON.

FISHERMEN AND OTHER SMALL CRAFT OPERATORS MAY WANT TO POSTPONE TRIPS
INTO THE GULF TODAY THROUGH MONDAY UNTIL CONDITIONS IMPROVE TUESDAY.

...COASTAL FLOOD IMPACT...
INCREASING SOUTH TO SOUTHWEST WINDS AHEAD OF A COLD FRONT WILL HELP
TO BUILDS SEAS OVER THE ADJACENT GULF WATERS TODAY AND TONIGHT.
THE INCREASING WINDS AND SEAS WILL CAUSE TIDES TO RUN SOME 2 TO 3
FEET ABOVE NORMAL FROM SAINT PETERSBURG BEACH NORTH TO CEDAR KEY
WHICH MAY CAUSE SOME MINOR COASTAL FLOODING...OVERWASH...AND MINOR
BEACH EROSION AT TIMES OF HIGH TIDE TODAY AND TONIGHT. IN ADDITION THE
RISK OF RIP CURRENTS AND STRONG UNDERTOWS AND LARGE BREAKING WAVE
ACTION WILL ALSO BE ON THE INCREASE.

RESIDENTS LIVING ALONG THE COAST SHOULD MONITOR WATER LEVELS TODAY
AND TONIGHT AND BE READY TO MOVE TO HIGHER GROUND SHOULD FLOODING
BE OBSERVED.

...RIP CURRENT IMPACT...
AS THE SEAS BUILD OVER THE GULF WATERS TODAY LARGE BREAKING WAVE
ACTION WILL DEVELOP ALONG AREA BEACHES WITH INCREASING RISK OF RIP
CURRENTS AND STRONG UNDERTOWS. RESIDENT AND VISITORS PLANNING TO
VISIT THE BEACH SHOULD HEED THE ADVISE OF THE BEACH PATROL. DO NOT
SWIM AT UNGUARDED BEACHES.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

...WIND AND SEA IMPACT...
WEST WINDS IN THE WAKE OF A COLD FRONT WILL REMAIN IN THE 20 TO
25 KNOT RANGE WITH GUSTS TO GALE UP TO FORCE OVER THE ADJACENT
GULF WATERS ON MONDAY. THESE STRONG WINDS WILL KEEP SEAS QUITE
ELEVATED WITH SEAS OF 6 TO 8 FEET NEAR SHORE AND 9 TO 11 FEET
OFFSHORE. THESE STRONG WINDS AND HIGH SEAS WILL PRODUCE HAZARDOUS
BOATING CONDITIONS AND FISHERMEN AND OTHER SMALL CRAFT OPERATORS
MAY WANT TO POSTPONE TRIPS INTO THE GULF UNTIL CONDITIONS IMPROVE
ON TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD MONITOR THE WEATHER AND SELF ACTIVATE IF NEEDED.

MCMICHAEL

In the hours before

Special weather statement, Nov 30, 9:59 AM EST, 1 hour 31 minutes before
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Special weather statement, Nov 30, 11:24 AM EST, 6 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1124 AM EST SUN NOV 30 2008

FLZ039-042-043-048>051-301730-
SUMTER-PINELLAS-HERNANDO-HILLSBOROUGH-CITRUS-LEVY-PASCO-
1124 AM EST SUN NOV 30 2008

...TORNADO WATCH IN EFFECT UNTIL 500 PM...
...STRONG THUNDERSTORMS WILL AFFECT MUCH OF WEST CENTRAL FLORIDA
EARLY THIS AFTERNOON...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES A LINE OF STRONG
THUNDERSTORMS FROM WILLISTON TO 60 MILES WEST OF EGMONT KEY...MOVING
EAST AT 40 MPH. THE THUNDERSTORMS WILL AFFECT CRYSTAL RIVER...
HOMOSASSA SPRINGS...BEVERLY HILLS AND SPRING HILL...UNTIL 1230 PM
EST. GUSTY WINDS OF 40 TO 50 MPH MAY CAUSE LOOSE OBJECTS TO BLOW
AROUND. MINOR DAMAGE TO TREE LIMBS AND WIRES IS POSSIBLE.

EO

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 30, 3:29 AM ESTLake Wind AdvisoryTBWDeSoto, Hardee, Highlands, Pinellas, Polk, Sumter15 hr
Nov 30, 8:41 AM ESTHigh Surf AdvisoryTBWPinellas55 hr
Nov 30, 9:09 AM ESTSpecial Marine WarningTBW96 min
Nov 30, 10:46 AM ESTSpecial Marine WarningTBW59 min
Nov 30, 11:43 AM ESTSpecial Marine WarningTBW62 min
Nov 30, 11:46 AM ESTSpecial Marine WarningTBW59 min
Nov 30, 11:51 AM ESTSpecial Marine WarningTBW54 min
Nov 30, 12:52 PM ESTSpecial Marine WarningTBW83 min
Nov 30, 1:50 PM ESTSpecial Marine WarningTBW40 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.