Western Australia Surf Forecast by Craig Brokensha (issued Wednesday 10th January)

Best Days: Saturday morning South West magnets, Monday and Tuesday

Recap

A kick in good swell across the South West yesterday with morning offshores, poor into the afternoon. Perth and Mandurah started tiny but Mandurah saw OK waves before the sea breeze developed.

This morning the swell was on the ease with average S'ly winds which will swing more onshore through the day.

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This week and weekend (Jan 11 - 14)

Today's onshore winds are linked to a weak front pushing across the South West, spoiling a new SW swell tomorrow as fresh and gusty SW winds persist across all locations.

Tomorrow's swell should be a touch stronger than yesterday's, coming in at 5-6ft across the South West, 2ft in Mandurah and 1-1.5ft up in Perth.

Winds across the South West as the swell eases Friday are still a little up in the air. We're likely to see variable tending S/SE winds across the northern half of the cape, but onshore across the southern half.

The swell will be down on Thursday and back to 3-5ft or so, with tiny waves in Perth and Mandurah though with morning offshore E/SE winds.

A small reinforcing S/SW swell is expected Saturday morning from a weak front passing the South West on Friday, with 3-4ft sets due early with much better E/SE offshore winds. Sunday will also be clean through the morning but small.

We then look ahead to the 'bombing low' in the Southern Ocean.

Currently tropical cyclones Ava and Irving are heading towards each other and will combine along with an injection of cold air in the Southern Ocean, north of Heard Island.

We're still expected to see this system 'bomb' with a slow moving fetch of severe-gale to storm-force W'ly winds due to be generated through our south-western swell window.

We should see two separate pulses of large long-period SW groundswell, the first for Monday ahead of a secondary larger kick late in the day/Tuesday morning.

The size has been downgraded a touch since the last update but we should see a large kick Monday to the 10ft range across the South West, 2-3ft in Mandurah and 2ft in Perth, with Tuesday morning possibly seeing a touch more size.

Conditions are looking great each morning with E'ly offshores Monday morning and E/NE winds Tuesday. We'll confirm this and the expected size on Friday.