Forecast issued at 4:30 pm WST on Saturday 25 May 2013.
Northern Western Australia
A high pressure system in the Bight , with a trough developing near the west coast. Expect a fresh easterly flow over northern districts for the next few days.
Southern and Central Western Australia
A high pressure system in the Bight slowly moving eastwards over the next few days, with a trough developing near the west coast. A middle level disturbance will affect western parts of the state on Monday, as a cold front approaches the southwest corner. On Tuesday the cold front will move into the Bight and weaken, while a ridge of high pressure will develop near the SW corner in its wake.
Forecast for the rest of Saturday
Isolated showers possible over the western and southern Pilbara, the western and northern Gascoyne and northern Central West.
Sunday 26 May
Isolated showers and thunderstorms over the southwest Pilbara, and the far northwest Gascoyne. Isolated showers extending through the remainder of the Gascoyne, the southern Pilbara, northern Goldfields, northern Central West and far western Interior. Isolated showers possible over the Southeast Coastal district , southern Goldfields, adjacent Eucla as well as west coastal parts of the SW Land Division.
Monday 27 May
Isolated showers and thunderstorms over the western of the Pilbara and adjacent Gascoyne. Isolated showers over the remaining Gascoyne, far western Interior, western Goldfields, western and northern parts of the SW Land Division, extending into central parts during the afternoon and evening. Thunderstorms possible near the SW corner during the evening.
Tuesday 28 May
Showers over the southwest half of the state. Thunderstorms possible about the lower SW and South Coastal district. Isolated thunderstorms in the western Pilbara and adjacent Gascoyne.
Wednesday 29 May
Isolated showers about the western Pilbara and adjacent Gascoyne. Isolated showers in the southern Interior and Eucla, clearing eastwards during the day. Isolated showers developing about the Lower West and SW districts during the day , and increasing towards evening, with possible thunderstorms.
The next routine forecast will be issued at 4:45 am WST Sunday.