Area Forecast Discussion
Issued by NWS Pago Pago
Issued by NWS Pago Pago
991 FXZS60 NSTU 220119 AFDPPG Area Forecast Discussion National Weather Service Pago Pago AS 219 PM SST Sun Apr 21 2024 .DISCUSSION... The latest satellite imageries continues to show open cell cumuli clouds moving across the area, producing consistent rainfall throughout the day, heavy at times. This pattern will continue throughout the week as a high pressure system to the south migrates eastward. A gentle to moderate easterly flow will remain across the islands throughout the week. The upper air profile from this afternoon (22/00Z) shows an unstable atmosphere. An increasing trend in showers with an enhances probability of thunderstorms remains over the area. Therefore, expect scattered showers with gentle to moderate easterlies for tonight through the short-term forecast period. Long term model data shows an easterly flow with embedded showers remaining for the rest of the forecast period. By this time frame, the high pressure system will have moved well east of the area, allowing a trough to the north to migrate closer to the territory by Wednesday night. Expect scattered to numerous showers with a gentle easterly flow for the rest of the week. && .Marine... Model data shows a downward trend in seas for the forecast period. Seas are around 5 to 7 feet gradually subsiding to 4 to 6 feet by Monday afternoon through at least Wednesday night. Seas will build again to 5 to 7 feet on Thursday through the end of the forecast period. Gentle to moderate (10 to 15 knots) easterlies will remain for tonight through Monday, decreasing to a gentle east breeze by Monday night into the rest of the week. Furthermore, the advisory for small crafts remains in effect. && .PPG WATCHES/WARNINGS/ADVISORIES... Small Craft Advisory && $$ JTAllen