TUESDAY 18th DECEMBER 2018 (PM SHIFT)
A warm and moist Northeasterly wind-flow continues to prevail over Samoa. Latest satellite loop shows scattered low-mid level clouds streaming over the Islands with some showery activities observed from local stations throughout the day. An upper divergence which enhanced showers at early hours of the day is moving Southward in the last 6-12 hours. This scenario marked the movement of deep convections away from the Islands. However, surface heating and warm Northeasterly flow could still support the development of convections within the nowcast period. But it would be only brief showers with a chance of a few thunderstorms to occur. Therefore, expect fair weather for both Islands.
WEDNESDAY TOWARDS MONDAY:
A ridge of high pressure will dominate the early part of the outlook period. Providing moderate to fresh Easterlies with drier and stable weather conditions. A convergence zoneis expected to descend over the islands from the North by Saturday followed by a trough of low pressure, and these two systems will be the rainmaker for the latter part of the outlook period.
MARINE OBSERVATION & OUTLOOK:
Aunuú bouy recorded wave height of less than 2.5m and remains below our advisory threshold. Wavewatch models predicted the current seas condition to persist throughout the outlook period.
ADVISORIES & WARNINGS: