The synoptic chart says it all: a cut-off mid latitude low just SW of the state is driving strong westerly winds into the lower SW of Western Australia.
Small onshore waves tomorrow, becoming large Friday afternoon and Saturday with strong onshore winds. Clean and easing around Perth Sunday and Monday. Large new S/SW groundswell for Tuesday with morning offshore.
Easing SW swell with a morning offshore tomorrow, smaller Wednesday morning ahead of an afternoon increase in new inconsistent SW swell. Onshore winds and easing surf Thursday, with an average W/SW swell for Friday.
Poor small and onshore tomorrow, larger mix of swells building Sunday with easing onshores, cleaner Monday morning and best in the South West Tuesday morning.
Onshore winds and new swell tomorrow, easing Friday and clean early in the South West. Onshore weekend with a large mid-period swell building Sunday, easing early next week as conditions improve.
Building SW swell tomorrow afternoon, easing Wednesday with a light morning offshore around Perth. Onshore again with a new W/SW swell Thursday, easing Friday and clean early.
XL building swell tomorrow with gale-force onshore winds, easing Sunday as winds slowly ease. No let up in the onshore winds across the South West next week, small windows for Perth early Tuesday and Wednesday.
Easing clean swell early tomorrow, onshore from the afternoon through the weekend and most of next week. XL swell building Saturday afternoon, easing Sunday.
Building SW swell tomorrow with onshore winds, easing Wednesday under S/SE breezes, clean early Thursday and smaller again. Large stormy mix of swells developing into the weekend.
Lots of swell for the state but with no let up in the onshore winds across the South West. Sunday is the cleanest.