Alert archive / Florida / High Surf Advisories in 2007

High Surf Advisory 3, NWS Tampa Bay, FL

April 15, 2007Pinellas County, Florida

NWS Tampa Bay, FL issued this high surf advisory at Apr 15, 2007, 4:42 AM EDT for Pinellas County, Florida. It took effect at Apr 15, 2007, 8:00 AM EDT. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued
Apr 15, 2007, 4:42 AM EDT (08:42 UTC)
In effect from
Apr 15, 2007, 8:00 AM EDT
Expired
Apr 16, 2007, 4:00 PM EDT
In force
32 hr
Issued by
NWS Tampa Bay, FL

County Pinellas County, FL

The radar

The Tampa radar (KTBW), 40 km from the middle of the area, began a volume at 08:42 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

Jacksonville, FL (KJAX), launched 00:00Z, 8.7 hours before the alert went out and 306 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 00:00Z on 2007-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 344 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, Jacksonville, FL at 00:00Z on 2007-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.1939587897Sfc1 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
344 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1113 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this high surf advisory 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 high surf advisory went out at Apr 15, 2:30 AM EDT, 2 hours 12 minutes earlier.

Area forecast discussion, Apr 15, 2:30 AM EDT, 2 hours 12 minutes before
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Hazardous weather outlook, Apr 14, 5:39 AM EDT, 23 hours 3 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
539 AM EDT SAT APR 14 2007

FLZ039-042-043-048>052-055>057-060>062-065-141500-
LEVY-CITRUS-SUMTER-HERNANDO-PASCO-PINELLAS-HILLSBOROUGH-POLK-
MANATEE-HARDEE-HIGHLANDS-SARASOTA-DE SOTO-CHARLOTTE-LEE-
539 AM EDT SAT APR 14 2007

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

.DAY ONE...TODAY AND TONIGHT.

...THUNDERSTORM IMPACT...
A STRONG COLD FRONT WILL MOVE THROUGH THE AREA OVERNIGHT AND INTO
SUNDAY MORNING. A SQUALL LINE WILL DEVELOP AHEAD OF THE FRONT
PUSHING STRONG TO SEVERE THUNDERSTORMS THROUGH THE NATURE COAST
AFTER MIDNIGHT...THEN THROUGH THE TAMPA BAY AREA AROUND
SUNRISE...AND THE SOUTH THROUGH MID SUNDAY MORNING. DAMAGING WINDS
AND LIGHTNING WILL BE THE MAIN HAZARDS WITH ISOLATED TORNADOES
ALSO POSSIBLE.

...WIND AND SEA IMPACT...
WINDS WILL INCREASE TO 15 TO 20 KNOTS NEAR SHORE AND AROUND 20
KNOTS WITH HIGHER GUSTS OFFSHORE THIS MORNING ON THE COASTAL
WATERS. WINDS WILL CONTINUE TO INCREASE THROUGH THE DAY...WITH
ADVISORY CONDITIONS EXPECTED ACROSS THE COASTAL WATERS BY THIS
EVENING. SEAS WILL BUILD UP TO 8 FEET OFFSHORE BY TONIGHT.
MARINERS OF SMALL CRAFT SHOULD POSTPONE TRIPS THIS WEEKEND.

...COASTAL FLOOD IMPACT...
STRONG ONSHORE WINDS WILL ALLOW WATER TO PILE UP ALONG THE
COAST...POSSIBLY CAUSING WATER LEVELS TO RISE 1 TO 3 FEET ABOVE
NORMAL TIDE. MINOR COASTAL FLOODING MAY OCCUR DURING HIGH TIDE
EARLY SUNDAY MORNING MAINLY ALONG THE NATURE COAST.

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

THE COLD FRONT WILL CONTINUE PUSHING THROUGH THE AREA THROUGH
MID-DAY SUNDAY. HIGH PRESSURE WILL BUILD ACROSS THE AREA BEHIND
THE FRONT. WINDS SUNDAY WILL INCREASE TO 15 TO 25 MPH WITH HIGHER
GUSTS ON LAND AND 20 TO 30 KNOTS WITH HIGHER GUSTS OVER THE
COASTAL WATERS. SEAS WILL BUILD UP TO 11 FEET OFFSHORE. THE HIGH
ONSHORE WINDS WILL CAUSE A HIGH RISK FOR RIP CURRENTS AND CREATE
ROUGH AND DANGEROUS HIGH SURF CONDITIONS THROUGH EARLY MONDAY.

DRIER AND COOLER AIR WILL MOVE INTO THE AREA MONDAY CAUSING
CRITICALLY LOW HUMIDITIES ACROSS THE AREA MONDAY AFTERNOON.

ANOTHER COLD FRONT IS EXPECTED TO MOVE THROUGH THE AREA WEDNESDAY
BRINGING ANOTHER ROUND OF THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD MONITOR THE WEATHER. FORMAL ACTIVATION MAY BE
NEEDED.

COLSON

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 5:30 AM EDTSpecial Marine WarningTBW90 min
Apr 15, 7:14 AM EDTSpecial Marine WarningTBW91 min
Apr 15, 8:39 AM EDTSpecial Marine WarningTBW51 min
Apr 15, 8:56 AM EDTTornado WarningTBWHernando, Pasco34 min
Apr 15, 9:29 AM EDTTornado WarningTBWHernando, Pasco, Sumter31 min
Apr 15, 9:30 AM EDTSpecial Marine WarningTBW60 min
Apr 15, 10:02 AM EDTSevere Thunderstorm WarningTBWManatee28 min
Apr 15, 10:30 AM EDTSpecial Marine WarningTBW90 min
Apr 15, 10:45 AM EDTSevere Thunderstorm WarningTBWPolk45 min
Apr 15, 1:30 PM EDTSpecial Marine WarningTBW30 min
Apr 15, 1:56 PM EDTRed Flag WarningTBWDeSoto, Hardee, Highlands, Pinellas, Polk, Sumter29 hr

Nearby

High Surf Advisories in Florida, 2007Every high surf advisory in 2007

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.