Area Forecast Discussion
Issued by NWS Pago Pago

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000
FXZS60 NSTU 160120
AFDPPG

AREA FORECAST DISCUSSION FOR AMERICAN SAMOA AND INDEPENDENT SAMOA
NATIONAL WEATHER SERVICE PAGO PAGO AS
220 PM SST MON SEP 15 2014

.SHORT TERM...
.TONIGHT THROUGH WEDNESDAY NIGHT...THE WATER VAPOR IMAGERY SHOWS A
BROAD AREA OF MOISTURE OVER FIJI SOUTHEASTWARD WHILE ANOTHER PORTION
EXTENDS JUST TO THE SOUTH OF SAVAII...UPOLU AND TUTUILA COASTAL
WATERS. AN EXISTING TRADE-WIND REGIME NEAR THE COOK ISLANDS WILL
CONTINUE TO MOVE ACROSS THE SAMOAN REGION DURING THE NEXT COUPLE
OF DAYS AS A DEVELOPING HIGH PRESSURE SYSTEM TO THE SOUTH OF FIJI
DRIFTS EASTWARD SLOWLY. A WEAK SURFACE TROUGH NEAR THE SAMOAN
ISLANDS WILL SLIDE EASTWARD OF MANUA DURING TUESDAY NIGHT INTO
WEDNESDAY. ALTHOUGH THESE WEATHER PATTERNS HAVE SOME INFLUENCE ON
THE LOCAL WEATHER...BUT THE MAIN WEATHER DRIVEN MECHANISM WILL BE
THE DEVELOPING HIGH PRESSURE AREA TO THE SOUTH OF THE FCST ZONES.
LOW-LEVEL CONVERGENCE UPSTREAM WILL GENERATE INCREASING CLOUDINESS
AND NUMEROUS SHOWERS DURING TUESDAY AND WEDNESDAY WHILE ONLY MINIMAL
SHOWERS ARE EXPECTED ACROSS THE SAMOAN ISLANDS STARTING WEDNESDAY.
THEREFORE...WILL KEEP THE PREV FCST THE SAME. ANTICIPATE WARMER
TEMPERATURES DURING TUESDAY WHILE OVERNIGHT LOWS WILL DROP TO THE
MID TO UPPER 70S.

.LONG TERM...
.THURSDAY THROUGH MONDAY...A HIGH PRESSURE SYSTEM TO THE SOUTH
WILL USHER FRESH TRADE-WINDS DURING THURSDAY AND FRIDAY. AS THE
HIGH PRESSURE SYSTEM ADVANCES EASTWARD...THE LOCAL WIND SPEED WILL
DECLINE TO NEAR 10 TO 15 KT DURING SATURDAY NIGHT. ANOTHER DEVELOPING
HIGH PRESSURE SYSTEM NEAR AUSTRALIA WILL BUILD EASTWARD THUS A SURFACE
RIDGE FROM THIS SYSTEM WILL CONNECT TO THE AFOREMENTIONED HIGH PRESSURE
SYSTEM CENTERED WELL SOUTHEAST OF THE SAMOAN ISLANDS. THIS SURFACE
RIDGE WILL YIELD TO FAVORABLE WEATHER CONDITIONS WHICH WILL EXTEND
NEAR THE SAMOAN ISLANDS DURING THE WEEKEND INTO THE NEW WEEK.
THEREFORE...ANTICIPATE MINIMAL SHOWERS OVER THE NEXT SEVERAL DAYS.

&&

.MARINE...COMBINED SEAS ARE BORDERLINE NEAR ADVISORY THRESHOLDS
FOR SMALL CRAFT AND HIGH SURF ADVISORIES. WILL MONITOR THIS
SITUATION AS SEAS REMAIN NEAR 5 TO 7 FEET OVER THE NEXT SEVERAL DAYS.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...
.NONE.

&&

$$

BAQUI






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