Area Forecast Discussion
Issued by NWS Pago Pago

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000
FXZS60 NSTU 190123
AFDPPG

AREA FORECAST DISCUSSION FOR AMERICAN SAMOA AND INDEPENDENT SAMOA
NATIONAL WEATHER SERVICE PAGO PAGO AS
223 PM SST SAT FEB 18 2017

.SHORT TERM...
.TONIGHT THROUGH MONDAY NIGHT...A SERIES OF MODERATE TO HEAVY
RAINFALL AND ISOLATED TSTMS WILL CONTINUE INTO THE EARLY DAYS OF
THE NEW WEEK. AN INFAMOUS MONSOONAL TROUGH FROM YESTERDAY WILL
BRING A LOT OF MOISTURE AND GUSTY NW WINDS UP TO 35 KT ACROSS THE
SAMOAN ISLANDS. THEREFORE...ANTICIPATE FREQUENT SHOWERS AND
LOCALLY HEAVY RAINFALL THROUGH MONDAY NIGHT.

.LONG TERM...
.TUESDAY THROUGH SATURDAY...A SURFACE RIDGE UPSTREAM WILL BRING
FAVORABLE AND DRY WEATHER CONDITIONS ACROSS THE FCST ZONES. AN
ELONGATED MONSOONAL TROUGH AXIS WILL TRACK SSE...MEANWHILE
MODERATE TO FRESH NW WINDS ARE EXPECTED DURING MOST OF THE LONG
TERM. AS A RESULT...ANTICIPATE A QUIET FCST PERIOD WITH ONLY
ISOLATED TO SCATTERED SHOWERS OVER THE NEXT SEVERAL DAYS.

&&

.MARINE...LARGE SEAS AND LOCALLY GENERATED SWELLS ASSOCIATED WITH
THE MONSOONAL TROUGH WILL BE HIGHER NEAR THE TROUGH AXIS. FNMOC
WW3 SUGGESTED SEAS UP TO 12 FT NEAR THE ENE OF AMERICAN SAMOA AND
W OF SAVAII TONIGHT THROUGH SUNDAY. UNFORTUNATELY...MAINLY CALM SEAS
HAVE BEEN OBSERVED ACROSS AMERICAN SAMOA. THE LATEST ASCAT SWATH
SHOWS SURFACE WINDS UP TO 25 KT ALONG THE W AND N PERIPHERY OF
UPOLU AND SAVAII. PERHAPS SEAS ARE HIGHER NEAR SAVAII THAN THE
REST OF THE FCST ZONES UNTIL LATE TONIGHT INTO SUNDAY NIGHT. AS A
RESULT...ANTICIPATE SEAS TO CONTINUE BUILDING SUNDAY NIGHT TO
NEAR 9 TO 12 FT AS THE BULK OF HEAVY RAINFALL AND STRONG GUSTS
PASS THROUGH THE COASTAL WATERS.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...

A FLASH FLOOD WATCH HAS BEEN EXTENDED UNTIL MONDAY NIGHT.
A SMALL CRAFT ADVISORY REMAINS IN EFFECT.
A SPECIAL WEATHER STATEMENT.

&&

$$

CB








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