Forecast issued at 4:31 pm EST on Saturday 2 August 2014.
A strong high pressure system over western Victoria extends a firm ridge over southern and central Queensland. The high will move slowly eastwards into the western Tasman Sea while strengthening on Sunday, extending the firm ridge into northern Queensland. Another high pressure system will move eastwards over southern western Australia on Monday and across the Great Australian Bight on Tuesday and Wednesday. A surface trough should develop over the tropical interior on Sunday and shift west into western Queensland on Monday in response to a developing upper level trough over central Australia.
Forecast for the rest of Saturday
Fine and mostly clear over most of the state. Isolated light showers about the far northeastern tropical coast. Moderate to fresh southwest to southeasterly winds.
Sunday 3 August
Isolated showers along the north tropical east coast, central coast, and the southern coast, tending scattered along the coast between about Cooktown and Cardwell. Fine and mostly sunny elsewhere with areas of morning frost over the southern interior. Moderate to fresh south to southeasterly winds, strong and gusty at times along the Gulf coast, and central parts of the east Queensland coast.
Monday 4 August
The high is expected to move slowly east and weaken, and the next upstream high should move eastwards across southwestern Australia while strengthening. Thus maintaining the firm ridge along the east coast of Queensland and fresh to strong southeasterly winds. Isolated showers should develop along remaining parts of the east coast in the moist onshore wind flow, and become scattered about the North Tropical Coast. An upper trough should shift north over central Australia, and a surface trough should shift into western Queensland. Onshore flow should feed sufficient moisture over the interior to the east of the surface trough increasing chances of isolated showers about the western, central and southern interior. Early frosts to continue about inland southeastern parts.
Tuesday 5 August
The strong high is expected to move slowly over the Great Australian Bight, maintaining the firm ridge and fresh to strong winds along the Queensland east coast. Scattered showers about the northeast coast, with isolated showers about the remaining east coast in the moist onshore wind flow. There is some uncertainty surrounding the development and movement of the upper trough, and subsequent moistening of the flow into the eastern side of the surface trough. At this stage it appears there is potential for isolated showers to develop through the western and central interior.
Wednesday 6 August
The high is expected remain slow moving over the Great Australian Bight while weakening slightly but fresh to strong southeasterly winds about the east coast are likely to continue. Scattered showers about the northeast coast, with isolated showers about the remaining east coast in the continuing onshore wind flow. Uncertainty continues about the development and movement of the upper trough but there is a possibility of isolated showers over the northwest and central interior.
Thursday until Saturday
The high is expected to move slowly east and weaken as it moves into the Tasman Sea late on Friday. The fresh to strong southeasterly winds about the east coast are therefore likely to decrease. Scattered showers about the northeast coast, with isolated showers about the remaining east coast. There is some uncertainty about the development and movement of the upper trough during the outlook period but there is a possibility of isolated showers over the northwest and central interior on Thursday.
The next routine forecast will be issued at 4:30 am EST Sunday.