National Weather Service United States Department of Commerce

FXZS60 NSTU 260039

Area Forecast Discussion
National Weather Service Pago Pago AS
139 PM SST Mon Mar 25 2019

Latest visible satellite imagery shows the active trough that
brought rainfall and thunderstorms across the territory overnight
is mainly south of the Samoan islands this afternoon. There are
still few thunderstorms shown over surrounding waters, but each
frame shows a diminishing trend in cloud coverage across the
territory. This is in agreement with current model data, showing
this trough migrating and remaining south of the islands through
the week. Keeping the trough south of the islands is a surface
ridge that will dominate weather conditions across the forecast
area through at least Thursday. There are still some showers that
will migrate over the islands from the aforementioned trough by at
least Wednesday, but will be scattered.

In the long term, model data show the trough edging back close to
the territory over the weekend.

Light and variable winds will also dominate across the area
throughout the week.


Model data have downplayed heights the past few days as evident in
latest PacIOOS Aunu`u wave buoy, showing heights meeting the 8
feet criteria for at least small crafts mainly due to the arrival
of a southerly swell. As current Wave Watch III model output
continue to show a subsiding trend after today, completely
different from observations, will continue the advisory for small
crafts until tomorrow morning and also issue an advisory for high
surfs as the translated surfs meet advisory criteria.


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