Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
556 FXZS60 NSTU 270100 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 200 PM SST Tue Aug 26 2025 .Short term... TONIGHT THROUGH THURSDAY NIGHT...A ridge positioned to the south will continue to drive breezy to locally strong easterly trade winds across the islands through tonight. These winds may occasionally become gusty over higher elevations, especially through island channels and downslope regions. By Wednesday, an active trough is expected to pass south of the islands, slightly easing tradewind speeds into a moderate to locally breezy range through Thursday night. Despite the slight decrease in wind intensity, the overall easterly flow will persist. Moisture embedded in the trades will keep scattered showers moving across the region, primarily focused over mountainous areas. Rainfall amounts are expected to be scattered, with no significant accumulations anticipated. .Long term... FRIDAY THROUGH TUESDAY...Breezy easterly winds will persist through the weekend, supported by a lingering trough far to the south of the islands. Wind speeds will remain elevated through island channels. Starting Sunday night, a strong high pressure system building to the southwest will bring a noticeable increase in tradewind strength. Winds will likely return to strong levels, particularly over exposed coastal areas and through island channels. These stronger trades are forecast to hold through Monday and Tuesday. Scattered showers will continue during this time, again focused over mountainous areas. The moisture associated with the strong high pressure will hold scattered showers through the new week, though no widespread heavy rainfall is expected. && .Marine... Rough seas will remain across the islands and the coastal waters through the weekend and into the new week. With the breezy to strong winds and swells from the south, rough seas will persist tonight and the next several days. Seas will subside 6 to 8 feet on Saturday. This will continue through Sunday before the trades increase on Sunday night, triggering seas to build 7 to 9 feet. && .PPG WATCHES/WARNINGS/ADVISORIES... High Surf Advisory remains in effect Small Craft Advisory remains in effect && $$