textproduct: WSO Pago Pago

DISCUSSION

The latest satellie imageries show a trough still lingering over the area. This trough was anticipated to move away from the area by this morning. However, satellite imageries together with the upper air observations (RAOB) from this afternoon (11/00Z) supports an unstable atmosphere. Thunderstorm activity embedded within the wind flow are shown to move across the Samoa Islands from time to time. This pattern will likely remain over the islands for tonight. Model projections show a ridge building over the area on Wednesday and remain through the rest of the week. Expect numerous showers, heavy at times, with possible thunderstorms and light to gentle northeast winds for tonight through at least early Wednesday.

Also shown on model data is a mid-level high pressure system lingering over the area for the rest of the forecast period. Thus, expect scattered showers with gentle to moderate easterlies to prevail for the long term forecast period.

There is a low potential for a tropical system to develop within the area of responsibility (AOR) for the next 7 days.

Marine

Favorable ocean conditions continue to remain across the coastal waters of American Samoa. Seas of 5 to 7 feet with peak periods around 14 seconds long will likely remain for tonight through at least Wednesday. These are the latest data collected at the PacIOOS buoys showing the long period swell from the northwest. Model projections show seas trending down more by at least Wednesday night through Thursday night, then slightly build again to 5 to 7 feet by the end of the week. These values align well with the light to gentle northeast winds through Wednesday night. The main threats for these conditions would be the higher surfs closer to shorelines and the potential for strong rip currents due to the long northwest periods. No other significant swell is expected for this forecast period.

PPG WATCHES/WARNINGS/ADVISORIES

NONE