Random Chaos
(Weather Analyst)
Tue Sep 20 2005 11:20 PM
Re: 72-hour forecast

Just highlighting a line from the last paragraph of the 11pm discussion...wow...NHC doesn't usually say things like this:

THE PREVIOUS ADVISORY INDICATING RAPID INTENSIFICATION FOR THE NEXT
24 HOURS APPEARS TO BE ON TRACK. DURING THE PAST 14 HOURS...THE
CENTRAL PRESSURE HAS DECREASED 20 MB...OR AT A RATE OF ABOUT 2
DVORAK T-NUMBERS PER 24 HOURS. WHILE SUCH A LARGE PRESSURE FALL
TREND RARELY OCCURS FOR MORE THAN 24 HOURS...THE VERY FAVORABLE
UPPER-LEVEL OUTFLOW PATTERN AND 30C-31C SSTS BENEATH RITA SUGGEST
THAT RAPID INTENSIFICATION SHOULD CONTINUE FOR AT LEAST ANOTHER 24
HOURS. A POLEWARD OUTFLOW CHANNEL IS WELL ESTABLISHED WITH OUTFLOW
ACCUMULATING INTO A LARGE UPPER-LEVEL LOW...OR MASS SINK...EAST OF
THE BAHAMAS. IN ADDITION... AN EQUATORWARD OUTFLOW CHANNEL ALSO
APPEARS TO BE DEVELOPING. GIVEN THE DUAL OUTFLOW PATTERN THAT IS
EXPECTED TO PERSIST FOR THE NEXT 36-48 HOURS...STRENGTHENING INTO A
CATEGORY 5 HURRICANE IS A DISTINCT POSSIBILITY.
BY 72 HOURS... A
GRADUAL INCREASE IN THE SOUTHWESTERLY VERTICAL SHEAR IS EXPECTED TO
BRING ABOUT SOME WEAKENING. HOWEVER...THE GFS-BASED SHIPS MODEL
THAT IS INDICATING 25-30 KT OF SHEAR MAY BE INCLUDING THE WINDS
ASSOCIATED WITH THE STRONG OUTFLOW PATTERN DEPICTED BY THE MODEL.
THIS WOULD MEAN THAT THE GFS SHEAR IS TOO HIGH...AND THUS...THE
SHARP GFS WEAKENING OF RITA DOWN TO 99 KT AT LANDFALL WOULD BE
PREMATURE. THE OFFICIAL INTENSITY FORECAST LEANS CLOSER TO THE FSU
SUPERENSEMBLE INTENSITY FORECAST OF 122 KT IN 48 HOURS AND 126 KT
IN 60 HOURS.



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