Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
801 FXZS60 NSTU 180004 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 104 PM SST Mon Aug 17 2026 .Short term... Plenty of sunshine has been observed over all islands of American Samoa today as a weak ridge remains over the region with drier than average air in the lower levels of the atmosphere. The ridge is forecast to move further away on Tuesday and Tuesday night as southeasterly winds slowly increase to around 10 mph. The risk of showers are isolated (10% chance) for the rest of today and tonight while Tuesday is 20% to 30% chance. .Long term... By Wednesday, a stronger ridge of high pressure from the southwest begins to move over the territory. This will increase southeasterly trades throughout the day before reaching up to 25 mph on Wednesday night through the rest of the week. More clouds than sun are anticipated. Trade wind showers may occur, but flash flooding from this potential rain is not expected. Overall for the next 7 days, rainfall is forecast to be below average but southeasterly trades return mid-week. Temperatures are to be at or just below normal. && .Marine... The PacIOOS buoys to the east of Aunu`u and to the west of Tutuila shows ideal sea conditions along the American Samoa coastal waters. As winds remain a gentle breeze through early Tuesday, seas are to remain around 5 feet. Southeasterly trades of up to 10 mph are forecast throughout the day on Tuesday, but seas are to remain well below the Small Craft Advisory criteria. For mid to late week, a strong ridge from the south is to move over the region. Southeasterly trades increase to a moderate to fresh breeze throughout the day on Wednesday before becoming a fresh to strong breeze by Wednesday night through the weekend. This is forecast to build seas of up to 12 feet as the breeze becomes strong. Expect Small Craft Advisory conditions during that time. && .PPG WATCHES/WARNINGS/ADVISORIES... NONE && $$ LaPlante