textproduct: WSO Pago Pago

DISCUSSION

Although fair weather conditions was observed throughout the day and the last 12 to 16 hours, the latest model projections and satellite imageries continue to show a trough lingering near west and south of the the islands. Model data show this trough migrating back over the territory by at least Sunday night. Upper air observations (RAOB) from this afternoon (20/00Z) show a conditionally unstable atmospheric profile potential building and increasing adverse weather conditions in the next couple of hours. Additionally, a high pressure system from the southwest will likely hold the trough over the area for the majority of the forecast period. This will maintain scattered to numerous showers with increasing wind strength as the week progresses.

Thus, expect scattered to numerous showers with a light to gentle breeze for tonight and Sunday, increasing to a moderate to fresh east-southeast wind flow for the rest of the forecast period.

Marine

Favorable ocean conditions remain across American Samoa coastal waters out to 40 nautical miles. Winds have also been light and variable for the last 16 to 24 hours. Model data have shown seas and wind to remain favorable for tonight through at least Sunday night. By Monday, winds will slightly increase to a moderate flow, increasing further to a fresh east flow by Tuesday. This increase in winds will likely elevate seas with peak periods sustaining at more than 10 seconds long for the entire forecast period. Although the peak periods are expected to be more than 10 seconds, the risk for rip currents will be minimal for this forecast period. Additionally, once winds increase on Tuesday, seas will likely become choppy.

PPG WATCHES/WARNINGS/ADVISORIES

NONE