Area Forecast Discussion
Issued by NWS Pago Pago

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FXZS60 NSTU 260056
AFDPPG

AREA FORECAST DISCUSSION FOR AMERICAN SAMOA AND INDEPENDENT SAMOA
NATIONAL WEATHER SERVICE PAGO PAGO AS
156 PM SST MON SEP 25 2017

.SHORT TERM...
TONIGHT THROUGH WEDNESDAY NIGHT...LATEST SATELLITE IMAGERY SHOWS
THE SAMOAN ISLANDS SANDWICHED IN BETWEEN TWO BANDS OF SHOWERS THAT
MARKS TWO TROUGHS. THE ONE TO THE NORTHEAST IS FORECAST TO BRING SHOWERS
ACROSS THE SAMOAN ISLANDS TONIGHT WHILE THE ONE TO THE
SOUTHWEST...THE MORE ACTIVE TROUGH...IS EXPECTED TO MOVE CLOSER TO
THE ISLANDS WEDNESDAY THROUGH FRIDAY. A STRONG HIGH PRESSURE SOUTH
OF THE ISLANDS WILL CONTINUE TO USHER MODERATE TO FRESH WINDS
ACROSS THE FORECAST AREA THROUGH THE SHORT TERM. WINDS WILL PEAK
AT ABOUT 25 MPH TUESDAY NIGHT THROUGH WEDNESDAY AS THE HIGH
PRESSURE IS STRONGEST...BEFORE GRADUALLY WEAKENING WEDNESDAY NIGHT
AS THE HIGH PRESSURE SYSTEM CONTINUE TO DRIFT EASTWARD.
HENCE...WILL ADJUST FORECAST TO REFLECT THE ABOVE SCENARIO OF
MODERATE TO FRESH EASTERLIES WITH PERIODS OF SHOWERS.

.LONG TERM...
THURSDAY THROUGH MONDAY...CURRENT MODEL DATA SHOW THE
AFOREMENTIONED TROUGH FROM TO THE SOUTHWEST OF THE SAMOAN ISLANDS
IS FORECAST TO MOVE EASTWARD...BRINGING SHOWERS ACROSS THE
TERRITORY THROUGH AT LEAST FRIDAY. A HIGH PRESSURE SYSTEM BEHIND
IT WILL BRING BACK GENTLE TO MODERATE TRADES BY THE WEEKEND WITH
PRIMARILY FAIR WEATHER ACROSS THE TERRITORY.

&&

.MARINE...
LATEST WAVE WATCH III MODEL OUTPUT SHOW HEIGHTS TRENDING UPWARDS AS
WINDS ARE FORECAST TO INCREASE COMBINED WITH A SOUTHERLY SWELL.
HENCE...WILL EXPECT ADVISORIES FOR HIGH SURFS AND SMALL CRAFTS TO
CONTINUE THROUGH AT LEAST THURSDAY AFTERNOON WHEN BOTH HEIGHTS AND
WINDS SUBSIDE TO BELOW ADVISORY THRESHOLDS.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY REMAINS IN EFFECT
HIGH SURF ADVISORY REMAINS IN EFFECT

&&

$$

LUTU-MCMOORE





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