Area Forecast Discussion
Issued by NWS Pago Pago

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FXZS60 NSTU 200048

Area Forecast Discussion
National Weather Service Pago Pago  AS
148 PM SST Tue Sep 19 2017

.Short term...
TONIGHT THROUGH THURSDAY NIGHT...Latest satellite imagery shows
the band of showers that has been bringing rainshowers across the
islands this afternoon is still lingering over the island chain.
This line of showers, marking a surface trough, is forecast to
continue to linger over the Samoan islands through the short term.
However, by Wednesday, the line will be pushed slightly north of
the territory as a high pressure system to the Southwest moves
Eastward. However, this line will then migrate back across the
island chain several times, bringing periods of showers across the
islands. Hence, expect gentle to moderate trades to return across
the forecast area by Wednesday, then diminish slightly again by
Thursday as the aforementioned high pressure continue to weaken as
it moves further East.

.Long term...
FRIDAY THROUGH TUESDAY...Current model data continue to keep the
aforementioned trough lingering near the Samoan islands through
the long term. Hence, will maintain previous forecast for the


Latest PacIOOS Aunu`u wave buoy observations show a Southerly
swell impacting coastal waters this afternoon. However, the
heights are not high enough to warrant any advisories for
mariners. Latest Wave Watch III/SWAN model data show heights
remaining below advisory thresholds this week. Hence, we do not
anticipate any advisories for coastal waters through the forecast





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