Weather Bulletin issued by the Vanuatu Meteorology and Geo-Hazards Department, Port Vila at 1:00 pm Tuesday, April 25, 2017
Synoptic Chart (250000Z).
A trough lies north of Vanuatu. While a broad ridge over to Central islands from a high-pressure system over New Zealand.
Latest satellite (IR/VIS) imagery including a six-hour loop indicates mostly few, scattered to broken low level and mid-level clouds over Vanuatu group. Evidence of few CBs over near Northern group. Latest METAR and Synoptic observations correlate with the imagery.
The trough mention above will remain near south of Solomon area till Friday as it deepens west of Vanuatu and slow moving. The high pressure mentioned above is slowly moving east and is expected over New Zealand till late Wednesday. The ridge is expected to remain over south Vanuatu till late Wednesday. A low pressure will develop over Tasman Sea on Wednesday, moving south southeast and will pass New Zealand on Friday with its associating trough with isolated showers over Vanuatu on Saturday. Another high pressure is expected over the Australian Bight on Saturday while extending a ridge towards Queensland.
Outlook for the next 7 days.
Partly cloudy about the group with chance of isolated showers and possibility of isolated thunder about parts of Northern Islands. Partly cloudy about the group with chance of brief showers about Northern islands is expected tomorrow and on Thursday. Isolated showers tending to isolated heavy falls later over parts of Northern and Central islands on Friday while brief showers expected elsewhere. Showers; becoming heavy at times, about the group on Saturday and Sunday next week. Isolated showers about the group on Monday and Tuesday. Light to moderate southeast winds about the group. Minimum temperature range from 21°C down south to 23°C up north. Maximum temperature range from 29°C down south to 33°C up north.