Area Forecast Discussion
Issued by NWS Pago Pago

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FXZS60 NSTU 180148

Area Forecast Discussion
National Weather Service Pago Pago  AS
248 PM SST Tue Oct 17 2017

.Short term...
.TONIGHT THROUGH THURSDAY NIGHT...A nearly stationary surface
trough will intensify as it remains across the Samoan Islands
through Thursday night. This trough combined with a mid-level
trough will generate increasing rainfall across the Samoan
Islands. As light and variable winds persist...sea and land breeze
conditions will also influence local weather especially during
mid-morning into afternoon hours. This situation will enhance
drier humidity...and a slight chance of afternoon thunderstorms
are possible. As a result...anticipate scattered to numerous
showers and isolated thunderstorms over the next few days.

.Long term...
.FRIDAY THROUGH TUESDAY...A surface ridge to the east of Manu`a
will destabilize a surface trough axis Friday night. This will
allow a high pressure system southwest of the area to build
eastward into the weekend thus allowing gentle to moderate
tradewinds to return Saturday night and Sunday. Will continue to
monitor this situation and provide updates. For now...anticipate
warmer conditions and isolated to scattered showers across the


.Marine...FNMOC Wave Watch III continues to show long-period
swells from the SW moving past the region around the weekend.
Though moderate seas are expected to last through Friday...these
expected SW swells will either boost local seas and surfs to
reach advisory thresholds or near borderline advisory levels. For
now...anticipate sea heights of 5 to 7 ft to persist over the next
couple days.




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