Area Forecast Discussion
Issued by NWS San Juan, PR

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FXCA62 TJSJ 250925
AFDSJU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
525 AM AST THU DEC 25 2014

.SYNOPSIS...MID TO UPPER LEVEL RIDGE WILL REMAIN AS THE MAIN WEATHER
FEATURE ACROSS THE REGION FOR THE NEXT SEVERAL DAYS. PATCHES OF
LOW LEVEL MOISTURE EMBEDDED IN THE TRADES WILL MOVE ACROSS THE
LOCAL ISLANDS TONIGHT INTO EARLY FRIDAY. FRONTAL BOUNDARY WILL
REACH THE FORECAST AREA SUNDAY.

&&

.DISCUSSION...DOPPLER WEATHER RADAR DETECTED ONLY LIGHT ISOLATED
SHOWERS MOVING SOUTHWESTWARD OVER THE SURROUNDING COASTAL WATERS.
LIMITED SHOWER ACTIVITY WAS DETECTED OVER LAND AREAS SO FAR THIS
MORNING. A GENERALLY DRY AIR MASS WILL CONTINUE TO MOVE ACROSS THE
REGION TODAY. THIS DRY AIR IN COMBINATION WITH AN UPPER RIDGE AND
ASSOCIATED SUBSIDENCE IS EXPECTED TO PRODUCE A FAIR AND STABLE
WEATHER PATTERN THROUGH AT LEAST SUNDAY. PATCHES OF LOW LEVEL
MOISTURE EMBEDDED IN THE TRADES WILL MOVE OVER THE REGION FROM
TIME TO TIME...INDUCING AN INCREASE IN PASSING SHOWERS OVER THE
LOCAL ISLANDS AND SURROUNDING WATERS. HOWEVER...THE AFOREMENTIONED
SUBSIDENCE ALOFT SHOULD LIMIT INTENSITY AND AREAL COVERAGE. AS THE
SURGE OF MOISTURE MOVES AWAY FROM THE REGION...A SHARP DECREASE IN
LOW LEVEL MOISTURE WITH FAIR WEATHER IS EXPECTED . THE CHANCE OF
PASSING SHOWERS WILL INCREASE AGAIN ON SUNDAY AS AN OLD FRONTAL
BOUNDARY REACH THE AREA.

&&

.AVIATION...ISOLD/SCT SHRA THRU FRI BUT MOST WL NOT LWR COND FM
VFR. WIND BLO FL100 ENE 12-20 KT THRU THU...FL100-FL200 NE 20-35 KT
BCMG ENE 20-25 KT TONITE/FRI.

&&

.MARINE...SMALL CRAFT SHOULD EXERCISE CAUTION DUE TO WINDS UP TO
20 KNOTS AND SEAS UP TO 6 FEET. NORTHEASTERLY SWELL STILL
EXPECTED FOR LATE FRIDAY AND INTO THE WEEKEND...DETERIORATING THE
MARINE AND SURF CONDITIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  83  71  84  71 /  30  30  20  20
STT  85  74  85  73 /  30  30  20  20

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...NONE.
VI...NONE.
COASTAL WATERS...NONE.
&&

$$

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