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 [Monday through Friday]
A new ridge of high pressure currently developing over Australia will push eastward into the Southwest Pacific Basin and drive the weather pattern for the long term forecast period. This ridge is forecast to begin building southeasterly surface trade winds over American Samoa by Monday, nearing 30 mph by late Tuesday and remaining strong for the rest of the week. This ridge should hold the aforementioned equatorial trough north of American Samoa through the first half of the week. However, the ridge is forecast to push another trough that is currently near New Zealand and Vanuatu eastward and into the area by early next week. Models depict that this trough will weaken significantly before reaching the Samoan islands, but should still increase atmospheric moisture enough to increase rain chances to scattered early next week.
By midweek, the equatorial trough to the north is forecast to strengthen as equatorial low pressure pushes the trough southward and near the American Samoa islands by the latter half of the week. Numerous to widespread showers are likely for the Thursday through Friday timeframe. It is too early to determine if this trough will bring a threat for flash flooding due to heavy uncertainties in it's exact progression at this extended range.
Marine
Today's marine observations from Aunu'u buoy indicate wave heights of around 7 to 8 feet driven by the moderate to fresh southeasterly breeze. This may make marine navigation difficult, especially for inexperienced mariners operating smaller vessels. Seas should slowly subside to below advisory levels by Saturday night into Sunday as trade winds gradually weaken.
Favorable sea conditions are expected late this weekend through early Tuesday. As strong southeasterlies build by late Tuesday, seas will begin building again. Seas and surfs are forecast to build to hazardous levels by Wednesday with High Surf Warning issuance being possible by mid to late week.
PPG WATCHES/WARNINGS/ADVISORIES
Small Craft Advisory remains in effect
IMPORTANT This is an independent project and has no affiliation with the National Weather Service or any other agency. Do not rely on this website for emergency or critical information: please visit weather.gov for the most accurate and up-to-date information available.
textproduct.us is built and maintained by Joshua Thayer.