Area Forecast Discussion
Issued by NWS Pago Pago

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FXZS60 NSTU 290120

Area Forecast Discussion
National Weather Service Pago Pago  AS
220 PM SST Wed Jun 28 2017

.Short term...
TONIGHT THROUGH FRIDAY NIGHT...Surface trough slightly to the
southwest is slowly descending southwest. Satellite shows
convections dissipating across the islands. However RAOB from this
afternoon depicted an unstable profile. A dry subsidence up north
will move across the islands late tonight and hence reduce
showers. A front approaching from the south will again enhance
showers across the islands on Friday morning. Also a gradual
increase of gentle trades from Thursday night to breezy conditions
on Friday morning. The cold front is expected to pass up north of
the islands on late Friday night as the strong high pressure to
the south migrates eastward. Therefore expect a gradual increase
of trades on Thursday night and the lingering of unstable weather
during the short term.

.Long term...
SATURDAY THROUGH WEDNESDAY...As the high pressure migrates farther
east, the trough up north will again move across the islands on
Monday. The trough will linger across the islands during the
beginning of the new week. Therefore with the trough moving back
across the islands, breezy trades will shift to gentle east
winds on Monday.


Southwest swells of 5 to 7 ft will continue to impact coastal
waters in the next few days. With this...surfs will climb 8 to 10
ft across south and west facing shores tonight. With the
approaching front and breezy trades moving across the islands on
Thursday night...seas will build 7 to 9 ft on Friday morning.


High surf advisory is in effect.
Small craft advisory is in effect.



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