268
FXZS60 NSTU 151810
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago  AS
710 AM SST Mon Jul 15 2024

.Update...

As of Monday morning, satellite imagery shows the trough over the
region. The trough is forecast to move north overnight tonight. No
heavy rainfall is expected. East/southeasterly winds are expected
to remain around 15 mph throughout the day.

.Previous discussion... /issued 134 PM SST Sun Jul 14 2024/

Short term...

Light easterly flow continues today across all islands of American
Samoa as more sun than clouds remained over the islands through
early this afternoon. By tomorrow, a very weak trough is expected
to move over the territory from the south. However, this trough
lacks moisture and wind convergence to create severe weather.
Mostly cloudy skies with scattered showers (50% chance) are
forecast to tomorrow. A ridge of high pressure will likely push
the trough to the north by Monday evening/Tuesday morning and
will remain throughout the week. This ridge would provide easterly
winds generally around 15 mph throughout the week with rainfall
below average.

Long term...

By late in the week and into the weekend, the ridge is forecast to
remain over the region. A trough is expected to remain south, but
the pressure gradient between the trough and the ridge may create
winds up to around 20 mph, still below Wind Advisory levels.
Otherwise, if showers occur, it will be in the passing form.

Marine...

Current information from both PacIOOS buoys to the west and east
of Tutuila show seas not only have subsided to below Small Craft
Advisory levels, but to ideal conditions for mariners throughout
the American Samoa coastal waters. The easterly gentle breeze this
morning is expected to increase to a moderate breeze this evening
and may reach up to a east/southeasterly fresh breeze by Monday.
The moderate to fresh breeze is expected to continue throughout
the week, which will increase wind driven waves to near or at Small
Craft Advisory levels. The strength of the southerly swell
decreases this week, but the wind driven seas will likely create
choppy waters starting tomorrow. This weather pattern is expected
to remain through late in the week.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...

A High Surf Advisory is in effect through Monday night.
A Small Craft Advisory is in effect.

&&

$$

LaPlante