Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
845 FXZS60 NSTU 060022 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 122 PM SST Thu Jun 5 2025 .Short term... A ridge of high pressure from the southeast remained over the American Samoa islands throughout the morning and early afternoon hours. As the ridge continues to weaken, the easterly trade winds have also weakened. However, more sun than clouds have been observed throughout the day today. We are monitoring a trough from the west than is expected to approach the territory late tomorrow and Saturday. Easterly winds are to become northeasterly throughout the day on Friday and weaken to around 10 mph. Even though stronger wind convergence, which leads to showers likely, will be to the south, additional moisture is forecast to advect into the lower levels of the atmosphere on Friday night through Saturday. This will lead to an increased chance of passing showers during that time, but rain is not expected to be heavy enough to cause flash flooding. Otherwise, more clouds than sun are anticipated throughout the day on Saturday with light winds on Friday night through Saturday night. .Long term... Another ridge of high pressure is expected to move over the region from the second half of the weekend and into the middle of next week. This would produce similar conditions to what is currently over the American Samoa islands from earlier this week with more sun than clouds during the day, east/southeasterly trades up to 20 mph, and an isolated to scattered chance (20 to 30% chance) of passing showers. Therefore, no severe weather is anticipated during this time. && .Marine... With easterly winds continuing to decrease from moderate to a gentle to moderate breeze, wind driven seas continue to ease. Also, south/southwesterly swell period timing continued to decrease this afternoon. Therefore, the Small Craft Advisory has been canceled. Benign conditions are forecast through at least Sunday morning with variable winds. By Monday, another ridge is anticipated to move into the region to increase east/southeasterly trades along with another round of long period southwesterly swell to begin moving through the region. This would likely create Small Craft Advisory conditions by early next week. && .PPG WATCHES/WARNINGS/ADVISORIES... NONE && $$ LaPlante