Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
032 FXZS60 NSTU 270120 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 220 PM SST Sun May 26 2024 .Discussion... As a ridge gradually diminishes over the territory, instability will increase in the area through midweek. This pattern is evident on latest satellite data showing some build up of clouds across the Islands. The lightning cast probability also detects lightning signals, which suggests possible thunderstorm development within the next hour. Expect scattered showers through tonight with a slight chance of thunderstorms. As mentioned earlier, the aforementioned pattern will hold through midweek until the ridge completely exits the region. Hence, passing showers and an east breeze of 10 to 15 mph will persist for this time. Thereafter, an active trough to the south will push towards the Islands on Thursday. Model data depicts an uptick in showers with the trough. Meanwhile, a strong ridge building behind the trough (Southwest of the Islands) will enhance windspeeds due to the difference in pressure gradients. Inclement weather is expected with this weather pattern, however, the potential for flooding is low at this time. .Marine... Latest wave heights remain around 4 to 6 feet, which indicates calm and smooth seas across the American Samoa coastal waters. Expect this wave state to continue through Monday before building Monday night. Model data has been consistent in this building trend due to a strong south swell. In addition, the enhanced winds expected Thursday will add on to even worse ocean conditions through the new week. We encourage all mariners to stay tuned as hazardous seas are possible for part or even most of the week. && .PPG WATCHES/WARNINGS/ADVISORIES... None && $$ TM