Western Australia Surf Forecast by Craig Brokensha (issued Wednesday June 29th)

Best Days: Tomorrow Margs and Mandurah, Friday all locations, Saturday and Sunday all locations, selected spots out of the wind Monday morning

Features of the Forecast (tl;dr)

• Inconsistent SW groundswell building later tomorrow PM, peaking Fri with moderate E/NE tending N/NE winds tomorrow, lighter E/NE tending N/NE winds Fri
• Large, long-period and inconsistent W/SW groundswell for Sat, peaking in the PM with moderate E/NE tending N/NE winds
• Large reinforcing levels of W/SW swell Sun PM and Mon with moderate E/NE tending N/NE winds on Sun, strong N/NE tending N/NW Mon
• Easing swell Tue with strong N/NW winds
• New moderate sized W/SW swell Wed with S/SW winds (S/SE early Perth and Mandurah)

Recap

Good improving waves across the South West yesterday with a new mix of mid-period W/SW and SW swells in the 5-6ft range, a bit cleaner today and slightly small to 4-6ft. Perth and Mandurah were fun with 2ft sets across both locations, building a little more around Mandurah into the afternoon as winds remain favourable.

Today we've got 2-3ft sets in Mandurah and 2ft waves across Perth with great conditions.

Silky in the South West this morning

This week and weekend (Jun 30 – Jul 3)

Our current mix of swells should ease back temporarily into tomorrow morning ahead of some new inconsistent W/SW groundswell into the late afternoon, peaking Friday morning.

The source of this swell was a distant but strong polar low that formed over the weekend to the south-east of South Africa.

Infrequent 5-6ft sets are due in the South West, with 2ft sets across Mandurah and 1-2ft waves in Perth under favourable, moderate E/NE tending N/NE winds tomorrow, similar Friday but lighter.

Saturday looks clean again with light to moderate E/NE tending N/NE winds along with a large, long-period building W/SW groundswell.

This swell has been generated the last couple of days by a very intense low forming south-east of South Africa again, projecting a fetch of severe-gale to storm-force W/SW winds towards us. The low is now weakening but will be followed by a broad, elongated fetch of weaker, strong to gale-force W/SW winds over the coming days, breaking down Friday evening.

We should see an initial, large, long-period W/SW groundswell for Saturday, peaking during the afternoon with reinforcing pulses of lower period W/SW energy on Sunday, easing slowly Monday.

Saturday's pulse will be largest and strongest with the South West building to 10ft+ across the exposed reefs, 3ft in Mandurah and 2-3ft across Perth.

Those local winds look favourable as stated above, with Sunday looking similar as the swell starts to slowly ease with moderate E/NE tending N/NE winds.

The reinforcing energy should maintain 6-8ft surf on Monday, 2-3ft sets in Mandurah and 2ft waves across Perth but winds will deteriorate as a trough approaches from the west. This will bring strong N/NE tending N/NW winds which may persist Tuesday before giving into a late W'ly change.

At this stage no major swell is expected in the wake of this change with some moderate sized mid-period W/SW swell likely to be in the mix. The models diverge from here onwards with more mid-latitude frontal activity and lows on the cards bringing dicey winds and mid-period swells but we'll have a closer look at this Friday. In the meantime make the most of the coming swells.