WEDNESDAY22ND AUGUST 2018, AM SHIFT.
Moist Easterly flow continues to prevail over Samoa, due to an intense high pressure system to the Southeast coincide well with the latest satellite loop which shows scattered low-level clouds streaming over the Islands along the Easterly flow. Moisture signature remains near surface. However, a convergence zone to the Northwest is predicted to descend near the group THIS MORNING with showery activities. An upper-level trough analysed West will also drift Eastward within the nowcast period enhancing the convergence zone. Therefore, expect partly cloudy with some afternoon showers for the northern district and cloudy with isolated showers, possible thunderstorms for southern and eastern areas.
THURSDAY TILL MONDAY:
A speed convergences will likely cause showers in the early part of the outlook period with gusty winds. The above-mentioned high will progress farther Eastward by the end of the week. Expect fair weather at most places with showers fall mainly over Highlands and windward locations in the latter part of the outlook period.
Observations from Aunu’u wave buoy show wave heights ranging from 5-7 feet. Most model predictions (JMA EPS, NCEP Wave, Wave watch, South Pacific Guidance) are not indicating any significant occurrence.