Area Forecast Discussion
Issued by NWS Pago Pago

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14
FXZS60 NSTU 200016

Area Forecast Discussion
National Weather Service Pago Pago  AS
116 PM SST Fri Apr 19 2019

Latest visible satellite imagery show cumuli building across the
forecast area. These showery cumuli appear attached to a trough to
the south of the Samoan islands. Current model data show these
showers lingering across the territory throughout the weekend and
into the new week as the associated trough remains nearly
stationary just south of the territory. Latest 20/00Z upper air
sounding also show a slightly unstable atmospheric profile,
verifying the enhanced chances for showers and thunderstorms
likely for American Samoa.

Additionally, winds will primarily be southeast and east throughout
the weekend, then becoming more southeasterly by Monday as the
associated high pressure system near New Zealand builds and
migrates eastward. In the long term, winds are forecast to become
more light and variable as the aforementioned high pressure
system moves further east.

Hence, will adjust forecast to slightly increase the probability
of precipitation for the short term and add thunderstorms for
surrounding waters.


Latest PacIOOS Aunu`u wave buoy show seas remaining between 8 to
10 feet this afternoon, maintaining thresholds for advisories.
Current SWAN Wave Watch III model output are keeping heights above
advisory criteria through at least Monday night, largely due to a
southerly swell. Hence, both high surf and small craft advisories
remains in effect.


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



ELM/TM is the U.S. government's official web portal to all federal, state and local government web resources and services.