Area Forecast Discussion
Issued by NWS San Juan, PR

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000
FXCA62 TJSJ 190809
AFDSJU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
409 AM AST FRI DEC 19 2014

.SYNOPSIS...UPPER LEVEL RIDGE WILL GRADUALLY BUILD THROUGH THE END
OF NEXT WEEK AND MAINTAIN FAIR WEATHER CONDITIONS. WEAK HIGH PRES
WILL BUILD OVR THE REGION DURING THE WEEKEND AND INTO EARLY NEXT
WEEK THEN WEAKEN ON CHRISTMAS EVE.

&&

.DISCUSSION...MORNING CLOUDS AND LIGHT SHOWERS ASSOCIATED WITH
SFC-700 MB TROF CURRENTLY MOVING WWD THROUGH THE AREA ARE EXPECTED
TO GRADUALLY FIZZLE OUT THROUGH THE DAY AS DRIER AIR ADVECTS IN ON
ENE WINDS. DRY AND PLEASANT WX TONIGHT AND SAT UNDER BUILDING
RIDGE SFC AND ALOFT. A MOISTURE SURGE IS FCST FOR SUN-SUN NIGHT
ASSOCIATED WITH AN AREA OF HIGHER TPW AIR JUST EAST OF THE LESSER
ANTILLES AND POSSIBLY A WEAK TRADE WIND SURGE. DRIER AIR BEGINS TO
FILTER IN AGAIN MON THROUGH THE END OF NEXT WEEK AS UPPER LEVEL
RIDGE AND ASSOCIATED SUBSIDENCE INVERSION STRENGTHENS FURTHER.

&&

.AVIATION...MOSTLY VFR CONDS EXPECTED AT ALL TERMINALS THROUGH THE
FORECAST PERIOD. PASSING -SHRA SHOULD CONTINUE THROUGH THE EARLY
MORNING HOURS ACROSS THE ATLANTIC AND CARIBBEAN WATERS...WITH VCSH
AFFECTING NORTHERN PR...USVI AND LEEWARD TERMINALS. SCT LAYERS
BETWEEN FL050-100. AFTER 16Z...VCSH POSSIBLE AT TJPS. EAST WINDS
BELOW FL100 AT 10-18 KT.

&&

.MARINE...WINDS AROUND 15 KT THROUGH TUE THEN DIMINISH CHRISTMAS
EVE AND CHRISTMAS DAY AS HIGH PRES WEAKENS AND SHIFTS EAST. SEAS
4-6 FT IN MIXED SWELLS AND WIND WAVES.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  83  70  84  72 /  10   0  20  20
STT  85  75  86  74 /   0  10  20  20

&&

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

$$

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