Forecast issued at 4:30 am EST on Tuesday 21 April 2015.
An intense low pressure system has developed near the boundary of the Hunter and Mid North Coast districts, and is expected to move gradually southwards later today. Gale force winds, heavy rain and dangerous seas are being generated on the southern side of this low. Meanwhile, a strong high centred to the south of Adelaide extends a ridge across the southern Tasman Sea, and another through central Australia. This ridge will become dominant during Wednesday and Thursday as the the low weakens into a trough and moves away to the east. The next cold front appears likely to cross the state at the end of the week.
Forecast for the rest of Tuesday
Widespread rain about central parts of the coast, heavy at times, extending onto the adjacent ranges and western slopes although generally less intense further inland. The chance of showers through remaining central and eastern districts, most likely on the southern coast. Isolated thunderstorms about the Hunter and Mid North Coasts. Fine and mostly sunny in the far west. Fresh to strong southeast to southwesterly winds, reaching gale-force along central parts of the coast, tending northwesterly in the northeast. Large seas creating dangerous surf conditions along much of the coast, with potential to cause damage by way of coastal erosion in central parts.
Wednesday 22 April
Showers about the southern and central coasts, and adjacent ranges. The chance of a shower or two in the northeast. Mostly fine and sunny west of the Divide. Southwest to southeasterly winds, fresh to strong near the coast, gradually easing later. Dangerous surf conditions along the coast.
Thursday 23 April
The chance of showers along the coast and adjacent ranges, mainly in the south. Fine and partly cloudy elsewhere. South to southwesterly winds.
Friday 24 April
The chance of a shower across the south and east, more likely on the western slopes of the southern ranges. Otherwise fine. West to southwesterly winds.
The next routine forecast will be issued at 4:30 pm EST Tuesday.