Area Forecast Discussion
Issued by NWS San Juan, PR

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FXCA62 TJSJ 260740
AFDSJU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
340 AM AST WED NOV 26 2014

.SYNOPSIS...UPPER LEVEL LOW OVR THE CNTRL ATLC WILL RETROGRESS
TOWARD 60W BY THANKSGIVING DAY. UPPER LEVEL RIDGE WILL BUILD ON
FRI THEN FLATTEN DURING THE WEEKEND AS SRN STREAM TROF MOVES
ACROSS THE SW ATLC.

&&

.DISCUSSION...UPPER LEVEL CONVERGENCE ON BACKSIDE OF RETROGRESSING
UPPER LOW WILL MAINTAIN STRONG SUBSIDENCE INVERSION THROUGH 12Z
SAT GREATLY INHIBITING SHOWER DEVELOPMENT. A SRN STREAM TROF WILL
MOVE ACROSS THE ATLC NORTH OF 20N DURING THE WEEEKEND AND ERODE
THE RIDGE AND ASSOCIATED SUBSIDENCE INVERSION PROMOTING MOISTURE
TRANSPORT AND STEEPENING LAPSE RATES WITH SCT SHOWERS DEVELOPING
IN THE AFTERNOON OVR INLAND AREAS. WINDS ALSO STRENGTHEN SAT INTO MID
NEXT WEEK ENHANCING NOCTURNAL SHOWER ACTIVITY ON WINDWARD AREAS.
THE STEERING FLOW BECOMES MORE FROM THE NORTHEAST SUN INTO WED
FAVORING MAINLY THE SOUTH COAST FOR PRECIP DURING THE DAY AND
NORTHEAST PR AT NIGHT.

&&

.AVIATION...VFR CONDITIONS EXPECTED NEXT 24 HOURS AT ALL TERMINALS.
EASTERLY WINDS WILL CONTINUE AT 15-25 KT WITH HIGHER GUSTS. NO SIG
OPERATIONAL WX IMPACT AT THIS TIME.

&&

.MARINE...NOT AS WINDY TODAY AS COMPARED TO YESTERDAY WITH WINDS UP TO
20 KT. WINDS DIMINISH RAPIDLY TONIGHT THROUGH FRI AS HIGH PRES
SHIFTS EAST AHEAD OF A COLD FRONT WITH SEAS SUBSIDING TO 3-5 FT.
WINDS STRENGTHEN AGAIN SAT INTO MID NEXT WEEK WITH SPEEDS UP TO 20
KT AND SEAS BUILDING 5-7 FT.


&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  86  78  85  75 /  30  30  10  10
STT  87  79  85  78 /  20  20  10  10

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...NONE.
VI...NONE.
COASTAL WATERS...SMALL CRAFT ADVISORY UNTIL MIDNIGHT AST TONIGHT FOR ANEGADA
     PASSAGE SOUTHWARD TO 17N-ATLC WATERS OF PUERTO RICO AND
     USVI FROM 10NM TO 19.5N-CARIBBEAN WATERS OF PUERTO RICO
     FROM 10 NM TO 17N-COASTAL WATERS OF NORTHERN PUERTO RICO
     OUT 10 NM-COASTAL WATERS OF NORTHERN USVI AND CULEBRA OUT
     10 NM-COASTAL WATERS OF NORTHWESTERN PUERTO RICO OUT 10 NM-
     COASTAL WATERS OF SOUTHERN USVI VIEQUES AND EASTERN PUERTO
     RICO OUT 10 NM-MONA PASSAGE SOUTHWARD TO 17N.

&&

$$

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