Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
319 FXZS60 NSTU 070129 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 229 PM SST Fri Jun 6 2025 .Short term... A ridge of high pressure over American Samoa led to a fair mix of sun and clouds throughout the morning and early afternoon hours. However, satellite imagery shows a trough just to the west of Samoa moving eastward towards American Samoa. Wind convergence is expected to weaken as it approaches the territory, but an elevated chance of showers is forecast for region. This rainfall is not expected to be heavy enough to cause flash flooding. Otherwise, we are forecasting plenty of clouds in the overnight hours with winds remaining light. The weak trough is expected to remain at least near the territory throughout the weekend. Scattered showers (50% chance) are forecast for Saturday and numerous showers (60% chance) on Sunday. If showers occur on both of these days, rainfall would spotty and not heavy. Winds are to remain light with mostly cloudy skies. .Long term... A strong ridge of high pressure from the southwest is expected to push the trough away from the territory. This will also create partly cloudy skies with plenty of sunshine throughout the days. Scattered showers (40% chance) are forecast on Monday, but becoming isolated (20% chance) on Tuesday through the rest of the week. East/southeasterly trade winds, however, increase up to around 20 to 25 mph. Severe weather is not expected for the next 7 days. && .Marine... Data from the PacIOOS buoys to the east of Aunu`u and to the west of Tutuila show seas around 6 to 7 feet for the majority of the American Samoa coastal waters. With weak winds and no major swell moving through the region this weekend, expect conditions to be below Small Craft Advisory levels. However, east/southeasterly trades are forecast to increase starting early next week and another round of long period south/southwesterly swell is anticipated to begin late Sunday night. Therefore, sea conditions are forecast to be benign, especially for the trade wind season, but back to Small Craft Advisory levels by Monday with a High Surf Advisory likely. && .PPG WATCHES/WARNINGS/ADVISORIES... NONE && $$ LaPlante