National Weather Service United States Department of Commerce

Heavy rain and higher elevation snow continue for the Northwest, fire danger continues in Southern California

A series of Pacific storms will bring strong winds, heavy rain, and mountain snow to the Pacific Northwest and northern Rockies through Sunday. Heavy rainfall and flooding is possible from the Mississippi Valley to the Deep South and Southeast U.S. this weekend and into early next week. Dry winds will prolong the fire weather threat for Southern California for several days. Read More >

FXZS60 NSTU 220048

Area Forecast Discussion
National Weather Service Pago Pago AS
148 PM SST Sat Oct 21 2017

.Short term...
TONIGHT THROUGH MONDAY NIGHT...Latest satellite imagery shows a
band of showers lingering to the south of the equator this
afternoon. This band of showers marks a weakening surface trough
that has brought some mid to high level clouds streaming across
the area through today. Current model data show this dissipating trough
bringing early evening passing showers across the islands. A high
pressure system is forecast to build across the area tonight,
bringing the onset of trades through Sunday night. By Monday,
latest model data still agrees with previous solutions in
developing a weak surface trough just north of Manu`a islands,
causing an uptick in showers and clouds. The aforementioned high
pressure system is then forecast to rebuild and push the trough
northward along with the associated showers by Tuesday. Hence, the
high pressure system will dominate weather conditions across the
territory through the short term with the exception of Monday.

.Long term...
TUESDAY THROUGH SATURDAY...Current model data show the
aforementioned high pressure system continue to migrate eastward
and weaken. Hence, expect gentle to moderate easterlies to prevail
across the forecast area with periods of showers.


Current PacIOOS Aunu`u wave buoy shows seas reaching advisory
thresholds this afternoon as a southerly swell reaches coastal
waters. Latest forecast data also show the return of moderate to
fresh level trades tonight. Hence, will issue both advisories for
small crafts and high surfs tonight. We anticipate these
advisories to remain through at least Monday afternoon.


High Surf Advisory is now in effect
Small Craft Advisory is now in effect