textproduct: WSO Pago Pago

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

Long term

For Friday and the weekend, rainfall is forecast to be above average. The aforementioned high to the south is expected to strengthen while an elongated ridge to the east moves closer to islands. This will cause stronger wind convergence with increasing northwesterly winds to create a South Pacific Convergence Zone setup over the islands throughout this time. We will monitor the exact location of the SPCZ throughout the week for the potential for flash flooding. Confidence is growing that the strong trough will be at least near the American Samoa islands for the potential to give continuous rainfall with cloudy skies. Northwesterly winds may reach up to 20 mph with higher gusts in heavier rainfall and stronger winds funneling through the Pago Pago Harbor region.

Marine

A south/southeasterly swell began to move through the American Samoa coastal waters throughout the overnight last night. The PacIOOS to the east of Aunu'u showed 18 second peak periods and 10 to 11 second average periods. These conditions are enough prompt a High Surf Advisory for the south and eastern shores of the islands through Wednesday. Throughout the day Wednesday, period timing is anticipated to slowly decrease as well as seas gradually subsiding. The advisory will likely be lifted late in the day. By Thursday, seas are anticipated to be below the Small Craft Advisory conditions. However, a trough is anticipated to form by late in the week and this weekend. Winds are to become northwesterly by Thursday and increase to a fresh breeze by the weekend. This is forecast to create choppy short period waters for Friday through Sunday.

PPG WATCHES/WARNINGS/ADVISORIES

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

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