Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
456 FXZS60 NSTU 180051 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 151 PM SST Tue Jun 17 2025 .Short term... Satellite imagery throughout the morning and early afternoon hours has shown plenty of clouds over the American Samoa islands with scattered showers, but the trough continues to weaken over the region. A ridge of high pressure from the southwest is to slowly push the trough to the north and a change of the weather pattern is to occur over the territory for the rest of the week. As the ridge moves over the region, this is forecast to bring increasing southeasterly winds up to around 25 mph at times through Friday evening. We continue to have numerous showers (70% chance) in the forecast for Wednesday, but in the form of passing tradewinds showers. An inversion is to occur over the islands on Thursday and Friday to reduce the risk of passing showersto scattered (40% chance). Overall, rain is not forecast to be strong enough to cause flash flooding but seasonable east/southeasterly winds reaching up to 25 mph is to occur at this time. Temperatures are also expected to be below normal. .Long term... The aforementioned ridge is forecast to move further away from the region by Friday night. This will allow a trough to the north to move over the territory on Friday night and Saturday. Easterly winds remain around 10 to 15 mph, but become northeasterly by Monday as a low pressure is anticipated to form near the Fiji region by early next week. Severe weather is not anticipated this weekend. && .Marine... Ideal conditions remained over the American Samoa coastal waters throughout the morning and early afternoon hours. However, there is high confidence that conditions are expected to change for Wednesday through Saturday. Wind driven waves build as a southeasterly breeze increases to a fresh to strong breeze by Wednesday evening. Winds are to become more easterly on Friday and Friday night, but the fresh to strong breeze continues. Therefore, expect Small Craft Advisory levels from mid-week through at least the beginning of the weekend. A southerly swell is to mix with the rough seas to reach High Surf Advisory conditions by Wednesday and may reach warning levels late in the week. && .PPG WATCHES/WARNINGS/ADVISORIES... NONE && $$ LaPlante