Area Forecast Discussion
Issued by NWS Pago Pago

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FXZS60 NSTU 170113

Area Forecast Discussion
National Weather Service Pago Pago  AS
213 PM SST Wed Aug 16 2017

.Short term...
TONIGHT THROUGH FRIDAY NIGHT...A low pressure to the south of the
region is the main driver for the weather during this period. As
it continues to move further south, a trailing trough brushes
over the Samoan region bringing in scattered to numerous showers
for the rest of the short term period. Because of a broad high
pressure system to the southeast this will help enhance the
likelyhood of the trough being stalled over the Samoan Islands
through the short term period before moving east. Therefore
expect winds to stay variable through Thursday night.

Additionally, another high pressure to the west will push the
trough further east through the weekend. This high pressure will
help cut off the trailing end of the low pressure to the south
and merge with the high pressure to the southeast.

.Long term...
SATURDAY THROUGH WEDNESDAY...Latest model solutions show the
latter aforementioned high pressure to the south merging with the
high pressure to the southeast. This high pressure will continue
to dominate the rest of the long term. Expect moderate to fresh
tradewinds to kick in again through the end of this forecast


Wave Watch III model solutions are showing sea heights of 7 to 9
ft through Friday before dropping below advisory levels. Data from
the PACiOOS Aunu`u buoy confirms these scenarios. Will extend the
high surfs and small crafts advisories until tomorrow afternoon.


A High Surf Advisory remains in effect
A Small Craft Advisory remains in effect



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