THURSDAY 24th MAY 2018, PM.
TONIGHT AND TOMORROW:
A weak trough analysed Southwest of Samoa this afternoon surface streamline. However, The Easterly wind-flow continues to affects the Islands with minimum showers due to a ridge from a high pressure further Southeast. In the upper-levels, A strong South-westerly winds aloft shears cloud tops from a cloudband associated with the aforementioned surface trough over the Islands. This scenario will provide cloudy condition for the Southern portion of the group within the now-cast period, whereas partial cloudiness for the Northern side. Expect possible few thunderstorms in some areas and minimum showers.
SATURDAY TILL TUESDAY:
Winds will change to Northerlies by Monday of the new week, this is because of a low pressure system materializing over the Vanuatu Is will advance Eastwards. As it reaches the South of Samoa; winds will change hence our islands will be affected with a combination of a trough of low pressure and a convergence zone. The high-pressure system centred 1034hPa over the continent of Australia will speed up the progression of the mention low pressure. As the low pressure passes, the mentioned high-pressure system will provide cool Trades whilst converging with the Easterlies just South of the islands. As of that time anticipate cool trades with low possibility of showers for the Northern side and showers may occur from time to time for the South due to the prevailing trades.
Numerical model prediction show waves to likely occur by Tomorrow evening due to fresh Easterly winds. In particular, it will provide southerly swells as the high pressures to the South intensifies while drifting Eastward. Small craft advisory issued in advance to be effective tomorrow evening for the Southern seas.
>> SMALL CRAFT ADVISORY WILL BE IN EFFECT TOMORROW EVENING <<