Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
125 FXZS60 NSTU 190107 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 207 PM SST Tue Jun 18 2024 .Short term... A ridge of high pressure has moved over the American Samoa islands today. This has caused a change in the weather pattern as rainfall is expected to be below average for the next 7 days. If a shower occurs through early Friday morning, it would be a passing shower and flash flooding is not expected. Winds are to decrease through at least early Friday. From Wednesday night through Friday morning, winds are forecast to be a light and variable wind. More sun than clouds are expected during this time, so temperatures are forecast to be above average. On late Friday afternoon through early Saturday morning, a shear line trough is anticipated to move from the south of the territory to the north. Mid level air will remain drier than usual, but there will be wind speed convergence as the trough moves through. Therefore, the risk of rainfall increases to numerous (60% chance) during this time but flash flooding is not expected. .Long term... After the aforementioned shearline trough moves to the north on Saturday, a strong ridge will move over the region. Confidence is high that winds will become southeasterly and may reach up to 20 mph. The drier than average rainfall is anticipated to continue from the weekend and into early next week. && .Marine... The latest information from the PacIOOS buoy to the east of Aunu`u shows seas remaining around 8 feet. The seas remained slightly higher than expected this afternoon as winds are still reaching a fresh easterly breeze with a long fetch of winds from the east. However, winds are expected to slowly decrease tonight to eventually become a light and variable breeze for Thursday and early Friday. There are no significant swell expected to move through, so sea heights will primarily be caused by wind driven waves. Since winds will decrease, expect seas to slowly ease through early Friday. && .PPG WATCHES/WARNINGS/ADVISORIES... A Small Craft Advisory remains in effect. && $$ LaPlante