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
A ridge to the south of the aforementioned trough is to strengthen and push the trough further north to be at least near the American Samoa islands for Friday night through Monday morning. In the meantime, an equatorial ridge to the north and east is to strengthen. This will create wind convergence that will increase the strength of the trough and to advect more moisture of the region. If the trough moves directly over the area, this may bring widespread rainfall and/or heavy rain at times pending on the exact location. This would warrant a Flood Watch during this time. If the heavy rainfall from the trough remains to the south, the risk of rainfall would still remain elevated (60% chance) for the weekend. We will continue to monitor this weather pattern and the development of the trough throughout the rest of the week.
Marine
The latest data from the PacIOOS buoys to the east of Aunu'u and to the west of Tutuila shows seas below the Small Craft Advisory criteria. Winds have decreased to a gentle easterly breeze throughout the day today to create less choppy conditions compared to earlier in the week. However, we are monitoring a southerly swell that is to begin moving through the waters later today and to last through the weekend. Seas are to build to 6 to 8 feet and build to 9 feet by the weekend. For Friday night through Monday morning, a strong trough is to move over to at least the southern half of the coastal waters region, which may bring heavy rain at times with gusty winds possible in showers along with the possibility of thunderstorms.
PPG WATCHES/WARNINGS/ADVISORIES
A Small Craft Advisory is now in effect.
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