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Hurricane Season - 2011


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TROPICAL WEATHER OUTLOOK

NWS NATIONAL HURRICANE CENTER MIAMI FL

800 AM EDT FRI AUG 19 2011

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

THE NATIONAL HURRICANE CENTER IS ISSUING ADVISORIES ON TROPICAL

DEPRESSION EIGHT...LOCATED ABOUT 55 MILES NORTHWEST OF CABO GRACIAS

ON THE HONDURAS-NICARAGUA BORDER.

1. A LARGE TROPICAL WAVE LOCATED ABOUT 900 MILES EAST OF THE LESSER

ANTILLES IS SHOWING SIGNS OF ORGANIZATION. ENVIRONMENTAL CONDITIONS

ARE EXPECTED TO GRADUALLY BECOME MORE CONDUCIVE FOR DEVELOPMENT AS

THE DISTURBANCE APPROACHES THE LESSER ANTILLES ON SATURDAY. THIS

SYSTEM HAS A MEDIUM CHANCE...40 PERCENT...OF BECOMING A TROPICAL

CYCLONE DURING THE NEXT 48 HOURS AS IT MOVES WESTWARD AT 20 MPH.

2. A BROAD LOW PRESSURE SYSTEM IS GRADUALLY BECOMING BETTER DEFINED

ABOUT MIDWAY BETWEEN THE CAPE VERDE ISLANDS AND THE WEST COAST OF

AFRICA. THE LOW IS PRODUCING A LARGE AREA OF THUNDERSTORMS...AND

UPPER-LEVEL WINDS ARE FORECAST TO BE CONDUCIVE FOR DEVELOPMENT AS

IT MOVES WEST TO WEST-NORTHWESTWARD AT 10 TO 15 MPH. THIS SYSTEM

HAS A MEDIUM CHANCE...50 PERCENT...OF BECOMING A TROPICAL CYCLONE

DURING THE NEXT 48 HOURS. REGARDLESS OF DEVELOPMENT...LOCALLY

HEAVY RAIN AND STRONG GUSTY WINDS ARE POSSIBLE IN THE CAPE VERDE

ISLANDS TODAY THROUGH SATURDAY.

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Deja vu....

Let's see.... Today is the 19th..... Assuming it slows down a bit (they usually do after they pass the leewards and start to turn...) We're looking at almost Labor Day weekend....

That's when Hurricane Frances destroyed life as I knew it......

And this looks suspiciously like a Frances in the making.....

storm_97.gif

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The first advisory for Irene. So far it's projected to reach Florida just short of a Cat 1 hurricane. A lot will depend on how much Haiti and Cuba take out of it. Storm 98 which is following Irene is projected to go out to sea (North Atlantic) as with many of the storms last year and this year.

TROPICAL STORM IRENE SPECIAL DISCUSSION NUMBER   1
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092011
700 PM AST SAT AUG 20 2011

AN AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT INVESTIGATING THE
TROPICAL WAVE EAST OF THE LESSER ANTILLES FOUND A SMALL LOW-LEVEL
CIRCULATION CENTER JUST SOUTHWEST OF A LARGE CONVECTIVE BURST AND A
MINIMUM PRESSURE OF ABOUT 1006 MB. THE PLANE ALSO MEASURED A
MAXIMUM WIND OF 53 KT AT 1400 FT AND BELIEVABLE WINDS OF ABOUT
45 KT FROM THE SFMR. THUS ADVISORIES ARE BEING INITIATED ON
TROPICAL STORM IRENE WITH AN INITIAL INTENSITY OF 45 KT.

A ROUGH ESTIMATE OF INITIAL MOTION IS ABOUT 280/19. A LARGE
MID-LEVEL RIDGE OVER THE CENTRAL AND WESTERN TROPICAL ATLANTIC IS
EXPECTED TO STEER IRENE TOWARD THE WEST-NORTHWEST OVER THE NEXT TWO
OR THREE DAYS. THIS RIDGE SHOULD WEAKEN DURING THAT TIME AND CAUSE
IRENE TO GRADUALLY DECELERATE. THE GUIDANCE IS IN GOOD AGREEMENT
ON A TRACK GENERALLY IN THE DIRECTION OF HISPANIOLA TO THE SOUTH OF
PUERTO RICO. THEREAFTER...A MID-LATITUDE TROUGH MOVING OFFSHORE OF
THE EASTERN UNITED STATES IS EXPECTED TO CAUSE A WEAKNESS IN THE
RIDGE. THIS COULD ALLOW IRENE TO GAIN SOME LATITUDE...ALTHOUGH THE
MODELS BEGIN TO SPREAD OUT LATE IN THE PERIOD. THE GFS AND ECMWF
SHOW ENOUGH OF A WEAKNESS TO BRING THE STORM NORTH OF CUBA...WHILE
THE UKMET AND THE CANADIAN HAVE ENOUGH RIDGING IN PLACE TO KEEP THE
STORM IN THE CARIBBEAN SEA. THE NHC FORECAST WILL SPLIT THOSE TWO
IDEAS AND LIES JUST TO THE WEST OF THE MODEL CONSENSUS.

THE INITIAL VORTEX IS STILL IN ITS FORMATIVE STAGES AND IT WILL
PROBABLY TAKE SOME TIME TO STRENGTHEN. HOWEVER...IRENE IS MOVING
OVER RATHER WARM WATERS WITH LIGHT SHEAR EXPECTED. MOST OF THE
RELIABLE GUIDANCE BRINGS THE STORM TO A HURRICANE BEFORE REACHING
HISPANIOLA...AND THE OFFICIAL FORECAST IS IN AGREEMENT WITH THIS
SCENARIO. THE INTENSITY FORECAST IN AT DAY 3 AND BEYOND IS RATHER
CHALLENGING DUE TO THE POTENTIAL FOR LAND INTERACTION. ALTHOUGH
THE NHC FORECAST WILL SHOW ONLY A SMALL AMOUNT OF
RE-INTENSIFICATION...ENVIRONMENTAL CONDITIONS COULD BE QUITE
FAVORABLE FOR STRENGTHENING IF IRENE AVOIDS SIGNIFICANT LAND
INTERACTION.


BASED ON THE OFFICIAL FORECAST...TROPICAL STORM WARNINGS HAVE BEEN
ISSUED FOR MANY OF THE LEEWARD ISLANDS...THE VIRGIN ISLANDS AND
PUERTO RICO.

NOTE...THIS SPECIAL ADVISORY TAKES THE PLACE OF THE STANDARD 800 PM
AST/0000 UTC INTERMEDIATE PUBLIC ADVISORY. THE NEXT ADVISORY WILL
BE THE FULL ADVISORY PACKAGE ISSUED AT 1100 PM AST/0300 UTC.

FORECAST POSITIONS AND MAX WINDS

INIT 20/2300Z 14.9N 58.5W 45 KT 50 MPH
12H 21/0600Z 15.4N 61.1W 45 KT 50 MPH
24H 21/1800Z 16.1N 64.4W 50 KT 60 MPH
36H 22/0600Z 16.7N 67.0W 55 KT 65 MPH
48H 22/1800Z 17.5N 69.6W 65 KT 75 MPH
72H 23/1800Z 19.0N 74.0W 45 KT 50 MPH
96H 24/1800Z 21.5N 77.0W 45 KT 50 MPH
120H 25/1800Z 24.0N 79.5W 55 KT 65 MPH

$$
FORECASTER BLAKE/BRENNAN
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Here's the part you really need to watch....

FORECAST VALID 22/0000Z 17.5N 65.5W
MAX WIND 55 KT...GUSTS 65 KT.
50 KT... 40NE 0SE 0SW 30NW.
34 KT...130NE 40SE 40SW 80NW.

FORECAST VALID 22/1200Z 18.2N 68.2W
MAX WIND 65 KT...GUSTS 80 KT.
64 KT... 20NE 0SE 0SW 20NW.
50 KT... 40NE 20SE 0SW 30NW.
34 KT...130NE 50SE 50SW 90NW.

FORECAST VALID 23/0000Z 18.9N 70.9W...INLAND
MAX WIND 50 KT...GUSTS 60 KT.
50 KT... 30NE 20SE 0SW 30NW.
34 KT...120NE 50SE 30SW 100NW.

FORECAST VALID 23/1200Z 19.6N 73.3W...INLAND
MAX WIND 45 KT...GUSTS 55 KT.
34 KT...140NE 90SE 60SW 110NW.

FORECAST VALID 24/1200Z 21.5N 76.5W...OVER WATER
MAX WIND 50 KT...GUSTS 60 KT.
50 KT... 50NE 40SE 30SW 50NW.
34 KT...140NE 90SE 60SW 110NW.

EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 175 NM
ON DAY 4 AND 225 NM ON DAY 5...AND FOR INTENSITY NEAR 20 KT EACH DAY

OUTLOOK VALID 25/1200Z 24.0N 79.0W
MAX WIND 65 KT...GUSTS 80 KT.

OUTLOOK VALID 26/1200Z 27.0N 81.5W...INLAND
MAX WIND 50 KT...GUSTS 60 KT.

You have to make an assumption at some point. That assumption means that over my roof, I'm well within any reasonable "arc" of 60 mph winds. When the wind speeds are above 75 mph, that's when things start to come apart.

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Talk about a forecaster hedging their bets.....

THE STORM IS BEING STEERED WEST-NORTHWESTWARD...285/17...BY THE FLOW
ON THE SOUTH SIDE OF A MID-LEVEL SUBTROPICAL RIDGE OVER THE WESTERN
ATLANTIC. OVER THE NEXT FEW DAYS...A COUPLE OF TROUGHS ARE FORECAST
TO CREATE A WEAKNESS IN THE RIDGE NEAR THE SOUTHEAST U.S.
COAST...WHICH SHOULD INDUCE A TURN TOWARD THE NORTHWEST. THERE IS A
FAIR AMOUNT OF SPREAD IN THE TRACK GUIDANCE MODELS...ESPECIALLY AT
DAYS 4 TO 5. FOR EXAMPLE...THE GFDL MODEL TAKES IRENE TO THE WEST
OF THE FLORIDA PENINSULA WHILE THE HWRF MODEL TAKES IT THROUGH THE
NORTHWESTERN BAHAMAS. INTERESTS IN FLORIDA ARE ADVISED NOT TO FOCUS
ON THE EXACT FORECAST TRACK BECAUSE OF THE INHERENT UNCERTAINTIES
IN LONGER-RANGE FORECASTS.


FORECAST POSITIONS AND MAX WINDS

INIT 21/1500Z 17.0N 63.2W 45 KT 50 MPH
12H 22/0000Z 17.5N 65.5W 55 KT 65 MPH
24H 22/1200Z 18.2N 68.2W 65 KT 75 MPH
36H 23/0000Z 18.9N 70.9W 50 KT 60 MPH...INLAND
48H 23/1200Z 19.6N 73.3W 45 KT 50 MPH...INLAND
72H 24/1200Z 21.5N 76.5W 50 KT 60 MPH...OVER WATER
96H 25/1200Z 24.0N 79.0W 65 KT 75 MPH
120H 26/1200Z 27.0N 81.5W 50 KT 60 MPH...INLAND

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And for the "bookies" on the Forum, place your bets.....

Numbers are the % of that particular scenario happening.

- - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - -

FROM FROM FROM FROM FROM FROM FROM
TIME 12Z SUN 00Z MON 12Z MON 00Z TUE 12Z TUE 12Z WED 12Z THU
PERIODS TO TO TO TO TO TO TO
00Z MON 12Z MON 00Z TUE 12Z TUE 12Z WED 12Z THU 12Z FRI

FORECAST HOUR (12) (24) (36) (48) (72) (96) (120)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
LOCATION KT

CHARLESTON SC 34 X X( X) X( X) X( X) X( X) X( X) 3( 3)

SAVANNAH GA 34 X X( X) X( X) X( X) X( X) X( X) 5( 5)

MAYPORT NS 34 X X( X) X( X) X( X) X( X) 1( 1) 7( 8)

JACKSONVILLE 34 X X( X) X( X) X( X) X( X) 1( 1) 7( 8)

DAYTONA BEACH 34 X X( X) X( X) X( X) X( X) 3( 3) 12(15)
DAYTONA BEACH 50 X X( X) X( X) X( X) X( X) X( X) 3( 3)

ORLANDO FL 34 X X( X) X( X) X( X) X( X) 4( 4) 14(18)
ORLANDO FL 50 X X( X) X( X) X( X) X( X) X( X) 3( 3)

COCOA BEACH FL 34 X X( X) X( X) X( X) X( X) 6( 6) 15(21)
COCOA BEACH FL 50 X X( X) X( X) X( X) X( X) X( X) 4( 4)

PATRICK AFB 34 X X( X) X( X) X( X) X( X) 6( 6) 16(22)
PATRICK AFB 50 X X( X) X( X) X( X) X( X) X( X) 4( 4)

FT PIERCE FL 34 X X( X) X( X) X( X) X( X) 8( 8) 17(25)
FT PIERCE FL 50 X X( X) X( X) X( X) X( X) 1( 1) 4( 5)
FT PIERCE FL 64 X X( X) X( X) X( X) X( X) X( X) 1( 1)

W PALM BEACH 34 X X( X) X( X) X( X) 1( 1) 11(12) 18(30)
W PALM BEACH 50 X X( X) X( X) X( X) X( X) 1( 1) 6( 7)
W PALM BEACH 64 X X( X) X( X) X( X) X( X) X( X) 1( 1)

MIAMI FL 34 X X( X) X( X) X( X) 1( 1) 17(18) 14(32)
MIAMI FL 50 X X( X) X( X) X( X) X( X) 3( 3) 6( 9)
MIAMI FL 64 X X( X) X( X) X( X) X( X) X( X) 2( 2)

MARATHON FL 34 X X( X) X( X) X( X) 1( 1) 16(17) 13(30)
MARATHON FL 50 X X( X) X( X) X( X) X( X) 4( 4) 6(10)
MARATHON FL 64 X X( X) X( X) X( X) X( X) 1( 1) 1( 2)

KEY WEST FL 34 X X( X) X( X) X( X) X( X) 12(12) 13(25)
KEY WEST FL 50 X X( X) X( X) X( X) X( X) 3( 3) 5( 8)
KEY WEST FL 64 X X( X) X( X) X( X) X( X) 1( 1) 1( 2)

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