Area Forecast Discussion
Issued by NWS Pago Pago

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FXZS60 NSTU 230048
AFDPPG

AREA FORECAST DISCUSSION FOR AMERICAN SAMOA AND INDEPENDENT SAMOA
NATIONAL WEATHER SERVICE PAGO PAGO AS
148 PM SST SAT APR 22 2017

.SHORT TERM...
TONIGHT THROUGH MONDAY NIGHT...LATEST SATELLITE IMAGERY SHOW OPEN
CELLED CUMULI UPSTREAM OF THE EASTERLY FLOW. THIS IS CONSISTENT
WITH A SURFACE TROUGH THAT IS FORECAST TO MOVE ACROSS THE SAMOAN
ISLANDS FROM THE EAST TONIGHT THROUGH THE SHORT TERM. HENCE...WILL
ADJUST PREVIOUS FORECAST SLIGHTLY TO INCREASE THE PROBABILITY OF
PRECIPITATION AS WELL AS TO ADD THUNDERSTORMS AS THE ATMOSPHERE
SHOULD BE MORE UNSTABLE WITH THE PASSAGE OF THE TROUGH. MODERATE
TO FRESH SOUTHEASTERLIES WILL REMAIN THEN BECOME MORE EASTERLIES
BY SUNDAY.

.LONG TERM...
TUESDAY THROUGH SATURDAY...LATEST MODEL DATA SHOW THE
AFOREMENTIONED TROUGH LINGERING CLOSER TO THE WESTERN SAMOAN
ISLANDS THROUGH THE NEW WEEK AS ANOTHER TROUGH FORMS NEAR MANU`A
AND MOVE SOUTHWESTWARD. PRECIPITATION IS SHOWN TO BE MORE
CONCENTRATED TO THE SOUTH OF THE ISLANDS THROUGH THE NEW WEEK.
HENCE...WILL MAINTAIN PREVIOUS FORECAST FOR NOW AND MAKE
ADJUSTMENTS IN THE FUTURE IF NECESSARY.

&&

.MARINE...
LATEST WAVE WATCH III SHOW SEAS REMAINING NEAR THE ADVISORY
CRITERIA FOR THE NEXT FEW DAYS. WINDS ARE ALSO FORECAST TO EXCEED
ADVISORY THRESHOLD THROUGH THE WEEKEND. HENCE...BOTH HIGH SURF AND
SMALL CRAFT ADVISORIES WILL REMAIN THROUGH THE NEW WEEK.

&&

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

&&

$$

LUTU-MCMOORE





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