Western Australian Forecast by Craig Brokensha (issued Wednesday October 23rd)

Best Days: Tomorrow morning, Sunday morning, Monday morning Margs, Tuesday morning, Thursday morning

Features of the Forecast (tl;dr)

• Easing swell tomorrow with light E/SE winds ahead of strong S/SW-SW sea breezes
• Small, building SW swell Fri with S/SE tending strong S/SE-SW winds
• Moderate + sized mid-period SW swell building Sat, peaking later, easing Sun
• S/SE tending S/SW-SW winds Sat, E/SE Sun AM ahead of sea breezes
• Small-mod sized SW swell Sun PM, easing Mon with E/SE tending S/SW-SW winds
• Moderate + sized SW groundswell Tue with E/NE tending S/SW winds
• Easing swell Wed with S/SE winds, smaller Thu with E/SE winds

Recap

Light winds eventuated across Perth and Mandurah through yesterday morning with a fun 2ft or so of swell, onshore and average across the South West.

Today we’ve got a bit more swell and decent conditions across Perth and Mandurah again while Margs was still fairly average with the cross-offshore S/SE breeze.

This week and next (Oct 24 - Nov 1)

Tomorrow looks much better for a surf across the South West with winds swinging offshore from the E/SE along with easing levels of swell from today.

Margs should come in around 4-5ft with fading 2ft sets in Mandurah, 1-2ft across Perth. Make the most of the morning as sea breezes will kick in through the afternoon.

As touched on in Monday’s notes, from Friday, building levels of mid-period SW swell are due thanks to weak but healthy frontal systems moving in from the south-west over the coming days.

Friday’s swell looks minimal in size and winds look fresh out of the S/SE ahead of strong S/SW-SW sea breezes, with better energy due to fill in Saturday afternoon.

This best pulse will be generated by near gale-force SW winds being projected towards us from the Heard Island region today.

The South West looks to build to 4-6ft Saturday afternoon with 2ft sets in Mandurah, 1-2ft across Perth, easing from a touch smaller size Sunday.

Winds look to be S/SE again on Saturday morning ahead of sea breezes, with better E/SE offshores on Sunday as the swell eases.

A smaller reinforcing pulse of mid-period SW swell is due Sunday afternoon, easing Monday along with morning offshores again.

Come Tuesday, our better SW groundswell is due, generated by a great fetch of pre-frontal W/NW gale to severe-gale winds ahead the formation of a low which will then generate stronger core winds but aimed away from us. There's also expected to be some long-range energy from the earlier stages of the pre-frontal storm, south-east of South Africa but this will be inconsistent and under the size of the more local swell source.

Moderate + sized levels of SW groundswell are due from the W/NW fetch with 6ft+ sets due across the South West, 2ft+ in Mandurah and 1-2ft across Perth along with morning E/NE winds.

A trough looks to bring a S/SE change into Wednesday as the swell eases, back offshore Thursday but smaller.

Longer term we’re looking at a return to frontal activity from late week into next weekend and beyond along with no major size. More on this Friday.