Tropical Storm PHILIPPE
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TROPICAL STORM PHILIPPE DISCUSSION NUMBER 20
NWS NATIONAL HURRICANE CENTER MIAMI FL AL172011
1100 PM AST WED SEP 28 2011
PHILIPPE REMAINS A SHEARED TROPICAL CYCLONE...HOWEVER DEEP
CONVECTION HAS DEVELOPED AND PERSISTED CLOSER TO THE LOW-LEVEL
CENTER DURING THE PAST SEVERAL HOURS. SATELLITE ESTIMATES FROM
TAFB AND SAB SUPPORT AN INTENSITY OF 40 KT...AND THIS COULD BE A
LITTLE CONSERVATIVE. THE UPPER-WIND PATTERN AHEAD OF PHILIPPE
APPEARS TO BE A LITTLE MORE CONDUCIVE FOR STRENGTHENING DURING THE
NEXT DAY OR SO. AN UPPER-LEVEL TROUGH TO THE WEST OF THE CYCLONE
IS FORECAST TO CUT-OFF AND MOVE SOUTHWESTWARD. THIS SHOULD RESULT
IN A REDUCTION OF THE SHEAR AND THE UPDATED NHC INTENSITY FORECAST
NOW CALLS FOR SOME MODEST INCREASE IN INTENSITY DURING THE NEXT
24-36 HOURS. THIS IS IN GOOD AGREEMENT WITH THE SHIPS/LGEM
GUIDANCE. IN 2 TO 3 DAYS PHILIPPE IS FORECAST TO MOVE NEAR THE
EASTERN SIDE OF AN UPPER-LEVEL RIDGE...IN AN AREA OF STRONG
NORTHERLY WINDS ASSOCIATED WITH THE OUTFLOW FROM OPHELIA. THIS
SHOULD CAUSE PHILIPPE TO QUICKLY WEAKEN AND BECOME A REMNANT LOW IN
ABOUT 4 DAYS.
THE TRACK FORECAST REASONING REMAINS UNCHANGED AND THE GUIDANCE
REMAINS IN FAIRLY GOOD AGREEMENT DURING THE FIRST 2-3 DAYS.
PHILIPPE SHOULD CONTINUE ON A WEST-NORTHWEST TO NORTHWEST MOTION
AROUND THE SOUTHWESTERN PERIPHERY OF A MID-LEVEL RIDGE OVER THE
EASTERN ATLANTIC. AFTER 72 HOURS...THE CYCLONE IS FORECAST TO TURN
WESTWARD AS A STRONG DEEP-LAYER RIDGE BUILDS OVER THE NORTH-CENTRAL
ATLANTIC. THE OFFICIAL FORECAST HAS BEEN ADJUSTED A LITTLE
WESTWARD DURING THE FIRST 72 HOURS...AND IS A LITTLE SOUTH OF THE
PREVIOUS TRACK THEREAFTER. THE NHC TRACK IS NEAR THE MIDDLE OF THE
GUIDANCE ENVELOPE.
FORECAST POSITIONS AND MAX WINDS
INIT 29/0300Z 17.4N 40.8W 40 KT 45 MPH
12H 29/1200Z 18.3N 42.1W 45 KT 50 MPH
24H 30/0000Z 19.8N 43.8W 50 KT 60 MPH
36H 30/1200Z 21.2N 45.6W 50 KT 60 MPH
48H 01/0000Z 22.2N 47.3W 45 KT 50 MPH
72H 02/0000Z 23.8N 50.9W 35 KT 40 MPH
96H 03/0000Z 24.5N 55.0W 30 KT 35 MPH...POST-TROP/REMNT LOW
120H 04/0000Z 24.5N 59.0W 30 KT 35 MPH...POST-TROP/REMNT LOW
$$
FORECASTER BROWN
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