American Samoa's Tropical Cyclone Outlook 2024-2025

WSO Pago Pago Office Predicts a normal to BELOW normal Tropical Cyclone (TC) Season for 2024-25 for American Samoa Read More >

990
FXZS60 NSTU 260105
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
205 PM SST Fri Apr 25 2025

.DISCUSSION...
The latest satellite imageries with GREMLIN applications
(composite radar reflectivity) clearly show a moist bounday layer
lingering just north of the Samoa Islands. Model data shows the
aforementioned boundary layer held in place by a high pressure
system to the south as open-cell cumuli clouds moves across the
territory in waves. This feature will likely dominate local
weather patterns for tonight through the beginning of the new week
as it brings moderate trade winds with embedded passing showers
from time to time.

By Tuesday, winds will slightly shift east, as the aforementioned
high pressure system continues to migrate east. Also, a shortwave
trough from the east will be pushed closer and over the territory
by this time frame. Expect moderate easterlies and embedded showers
to prevail for the rest of the forecast period. Will continue to
monitor as uncertainties in model data are far greater after 3
days of data resolutions.

&&

.Marine...
Data from the PacIOOS buoy to the west (King-Poloa) has been
reporting seas around 4 to 6 feet with peak periods around 10
seconds. With moderate trade winds prevailing across the area,
models are showing combined seas (swells & wind waves) gradually
building to at least 8 to 10 feet by Saturday night. This is
mainly due to a large south swell moving into the area together
with the trade winds. Models are showing seas easing below
advisory thresholds by at least Monday. Additionally, swell
periods of more than 10 seconds is expected and will likely
enhance surfs and strong rip currents for this time frame. This
will prompt the issuance of advisories for small crafts and high
surfs.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...
NONE

&&

$$

JTAllen