American Samoa's Tropical Cyclone Outlook 2025-26

Below Normal to Near Normal Tropical Cyclone (TC) Activity anticipated for American Samoa in the 2025-26 TC Season Read More >

058
FXZS60 NSTU 220029
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
129 PM SST Tue Apr 21 2026

.DISCUSSION...
Satellite observations of open-cell cumuli clouds streaming
across the islands as it builds into towering cumuli clouds
increased the potential for afternoon showers. These clouds are
associated with a high pressure system anchored southeast of the
area. However, upper air observations (RAOB) from this afernoon
(22/00Z) show stable conditions with prevailing gentle to moderate
east-southeast winds and decreased moisture content compared to
the last 12 to 24 hours. Model data show this high pressure
system lingering through at least Wednesday. By Wednesday night,
another broad high pressure system from the southwest will move
into the area as it generates gentle to fresh east-southeast winds
for the remainder of the forecast period.

Therefore, expect scattered showers, heavy at times with gentle to
fresh east-southeast winds for the rest of the week into the new
week.

&&

.Marine...
Favorable ocean conditions continue to remain across the American
Samoa coastal waters throughout the day. However, observations
from the PacIOOS buoys (Aunu`u & King-Poloa) show a gradual build
in seas. Seas will likely continue to build to at least 7 to 9
feet by tonight as a southwest swell moves into the area. Also,
the threat of rough seas, high surfs, and strong rip currents is
possible due to the swell periods peaking at more than 15 seconds
long. Gentle to moderate winds will also produce wind waves mixed
in with the aforementioned swell, keeping conditions rough for
tonight and Wednesday. Thus, a small craft advisory is now in
effect for tonight and Wednesday. Model data show seas subsiding
by late Wednesday into the rest of the forecast period.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory

&&

$$

JTAllen