A high pressure system lies in the Bight, directing an east to northeast flow
over the south of the state. Areas of high cloud will persist over the southern
half today, with hot to very hot temperatures expected over western parts as a
trough deepens near the west coast. In the north, isolated thunderstorms and
showers through the west Kimberley, east Pilbara and northwest Interior should
extend further into the Pilbara and eastern Gascoyne this afternoon.

The west coast trough will deepen further on Friday, and should trigger isolated
afternoon showers and thunderstorms over the western Pilbara, western Gascoyne
and the northern half of the Central West. 
The trough moves inland on Saturday ahead of an approaching cold front. Isolated
showers should develop about the southwest corner in the morning, possibly
extending as far as a line from Mandurah to Albany by the evening. The trough
may trigger very isolated afternoon and evening showers and thunderstorms over
central and eastern parts of the Division on Saturday afternoon. Afternoon
thunderstorm activity is also possible over parts of the Kimberley and the far
western Pilbara.
A high pressure ridge will rapidly develop to the south of the state on Sunday
in the wake of the front. An onshore flow is expected to produce isolated
showers along the south coast. The surface trough will lie over far eastern
parts of the Division and the adjacent Goldfields, and should again trigger very
isolated afternoon and evening showers and thunderstorms. Thunderstorm activity
should increase over the Kimberley on Sunday and extend into northeastern parts
of the Interior.

Thursday until midnight: NE winds 10/15 knots, easing to NE/SE 8/13 knots early
afternoon and S/SW 10/15 knots later in the  afternoon. Seas to 1.0m. Swell to
1.0m.
Swell at Cottesloe:  to 0.3m.
Winds on Melville Water: Similar, 5 knots lighter during the afternoon.

Friday: NE winds 10/15 knots, shifting NW 8/13 knots in the afternoon and W/SW
10/15 knots during the late afternoon. Seas to 1.0m. Swell to 1.5m.
Saturday: W/NW winds 8/13 knots, tending W/SW 13/18 knots during the afternoon.

Current Swell Observations:
Rottnest Waverider Buoy:  0.7m.
Cottesloe Waverider Buoy: 0.2m.

Current swell height information is supplied by the Department of Transport and
is current only at the time of issue of this forecast

The next routine forecast will be issued at 11:30 am WST Thursday.

Warning summary
Nil.


Forecast for Thursday 
Some high cloud about, although mostly sunny. Moderate to fresh NE winds, easing
before a sea breeze develops during the afternoon.

Precis:      Mostly sunny.                      
City:        Max 38 
Mandurah:    Max 35 

UV Alert:    8:50 am to 4:00 pm, UV Index predicted to reach 11 [Extreme]  
Fire Danger: Coastal Plain: HIGH        
             Hills:         HIGH        

Friday       Partly cloudy.                         Min 24     Max 39
Saturday     Cloudy periods.                        Min 21     Max 30
Sunday       Mostly sunny.                          Min 18     Max 29
Monday       Sunny.                                 Min 18     Max 30
Tuesday      Possible shower.                       Min 17     Max 25
Wednesday    Partly cloudy.                         Min 15     Max 24

The next routine forecast will be issued at 11:20 am WST Thursday.