Area Forecast Discussion
Issued by NWS San Juan, PR

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FXCA62 TJSJ 181816
AFDSJU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
216 PM AST THU SEP 18 2014

.SYNOPSIS...LEADING EDGE OF TROPICAL WAVE WILL MOVE ACROSS PUERTO
RICO AND THE U.S. VIRGIN ISLANDS TONIGHT. TROPICAL WAVE WILL MOVE
ACROSS THE LOCAL AREA TOMORROW AND WILL EXIT THE REGION FRIDAY
NIGHT. STRONG HIGH PRESSURE WILL EXIT THE EASTERN U.S. AND WILL
MOVE ACROSS THE WESTERN NORTH ATLANTIC DURING THE WEEKEND. ANOTHER
TROPICAL WAVE WILL MOVE ACROSS THE REGION MONDAY.

&&

.DISCUSSION...ISOLATED SHOWERS WITH THUNDERSTORMS DEVELOPED THIS
AFTERNOON OVER COAMO AND VILLALBA. REST OF PUERTO RICO AND THE
U.S. VIRGIN ISLANDS WERE UNDER PARTLY CLOUDY TO SUNNY SKIES.
LEADING EDGE OF TROPICAL WAVE WILL MOVE ACROSS PUERTO RICO AND THE
U.S. VIRGIN ISLANDS TONIGHT. THEREFORE...AN INCREASE IN SHOWERS
AND THUNDERSTORMS IS EXPECTED FROM EAST TO WEST. BETTER CHANCES
FOR SHOWERS TONIGHT WILL BE OVER THE U.S. VIRGIN ISLANDS AND
EASTERN PUERTO RICO. FOR TOMORROW...THE TROPICAL WAVE WILL MOVE
ACROSS THE LOCAL ISLANDS. THE COMBINATION OF THE TROPICAL
WAVE...WITH DAYTIME HEATING AND LOCAL EFFECTS PROMISE TO BRING A
GOOD DEAL OF SHOWER AND THUNDERSTORM ACTIVITY ACROSS THE
REGION...MAINLY IN THE AFTERNOON HOURS. PRECIPITABLE WATER VALUES
ARE EXPECTED TO BE ABOVE 2.0 INCHES MOST OF THE DAY
TOMORROW...WITH MOISTURE LINGERING THROUGH FRIDAY NIGHT.

WEATHER CONDITIONS WILL IMPROVE QUICKLY...AS A DRIER AIR MASS MOVES
ACROSS THE REGION BEHIND THE WAVE. SUNDAY LOOKS THE DRIEST
DAY...WITH ANOTHER TROPICAL WAVE EXPECTED TO AFFECT THE REGION BY
MONDAY AND TUESDAY NEXT WEEK. AS STRONG HIGH PRESSURE BUILDS NORTH
OF THE AREA DURING THE WEEKEND...PRESSURE GRADIENT WILL
TIGHTEN...WHICH WILL ALLOW TO AN INCREASE IN WINDS ACROSS THE
AREA.

&&

.AVIATION...VFR CONDS EXPECTED TO CONTINUE WITH VCSH/VCTS FOR
ALMOST ALL TAF SITES THIS AFTERNOON AND TONIGHT AS TROPICAL WAVE
APPROACHES FROM THE EAST. AS THE NIGHT PROGRESSES...MVFR CONDS ARE
POSSIBLE FOR ISLANDS TAF SITES...TJSJ AND TJPS. WIND BLO FL150
FROM E TO SE 6-14 KTS BECOMING NW ABV FL300 AT GREATER THAN 25
KTS.

&&

.MARINE...SEAS UP TO 4 FEET AND WINDS UP TO 16 KNOTS ARE EXPECTED
ACROSS THE COASTAL WATERS.


&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  78  88  79  88 /  60  60  10  20
STT  78  89  80  90 /  60  60  10  20

&&

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

$$

02/71











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