textproduct: WSO Pago Pago

DISCUSSION

Precipitable water (PWAT) shown on model data outlines moisture content associated with a line of clouds just north of the islands. This line is supported by the latest satellite imageries with clouds moving west-northwest in the trade winds flow. However, model data continues to show a trough to the east and northeast moving closer to the islands. This trough is expected to arrive in the area of responsibility (AOR) by late Sunday night and remain throughout the new week. The trough is also expected to weaken from time to time throughout the new week. Nevertheless, the trough will increase the potential for showers and the possibility for thunderstorms for this time frame. By the end of the forecast period, models show the trough migrating north as strong south winds push it north.

Therefore, expect fair weather patterns to remain for tonight through at least Sunday. Scattered showers with moderate to fresh trade will remain through Sunday, increasing to numerous showers on Sunday night. Trade winds will likely increase to a strong breeze on Thursday from the south.

Marine

Observations from the PacIOOS buoys show heights around 5 to 7 feet with periods around 11 seconds. Although these heights are below the advisory threshold, model data show an upward trend in seas, aligning with the increase in trades tonight through the at least Sunday night. Threats of elevated seas and high surfs with strong rip currents is expected for this time frame. Model data show seas easing back to favorable conditions on Monday through the end of the forecast period. Trade winds are expected to reach a fresh breeze tonight and throughout the forecast period. In the meantime, advisories for high surfs and small crafts remain in effect.

PPG WATCHES/WARNINGS/ADVISORIES

High Surf Advisory Small Craft Advisory