Western Australia Surf Forecast by Craig Brokensha (issued Monday 15th October)

Best Days: Early tomorrow Margs, most of morning Perth and Mandurah, Wednesday morning all locations

Recap

Small onshore waves across the South West Saturday, larger and messier Saturday with a building mix of groundswell and windswell.

Perth and Mandurah were small to tiny and onshore Saturday, larger and stormy yesterday as a mid-latitude front pushed into the coast.

This morning conditions were still average across the South West, cleaner but not ideal across Perth and Mandurah with weak onshore winds.

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This week and weekend (Oct 16 - 21)

We should see cleaner conditions across all locations tomorrow morning with a temporary low point in swell ahead of our new large long-period W/SW groundswell building into the afternoon.

The swell looks to be a touch smaller than forecast on Friday with the strong but slightly disjointed storm not being as ideally aimed through our swell window as it could be.

A pre-frontal fetch of severe-gale W/NW winds looked best, with a stronger but tighter fetch of storm-force W/SW winds around the core of a low, followed by strong to gale-force W/SW winds.

Size wise we're now looking at a strong pulse on size to 6-8ft, if not for the odd bigger one tomorrow afternoon/evening across the South West, with 2-3ft sets in Mandurah and 2ft+ in Perth.

The easing trend looks slow with easing 6-8ft sets across the South West magnets Wednesday morning, 2-3ft in Mandurah and 2ft+ Perth.

Coming back to the expected winds and all locations should see a morning E/NE offshore tomorrow morning, N/NW across the South West into the afternoon with SW sea breezes to the north.

Wednesday morning looks super fun with an E/NE offshore again, giving into stronger onshore winds through the afternoon as a mid-latitude front pushes in from the west.

This first front will be relatively weak and generating a broad and elongated fetch of strong W/SW winds while projecting east towards us.

A moderate sized mid-period W/SW swell is due off the front, building Thursday and then easing Friday.

Size wise the South West should build to 5-6ft, 2-3ft in Mandurah and Perth but with gusty W/SW tending SW winds, easing from a similar size range Friday with persistent W/SW winds.

From the weekend a couple of stronger storms will develop south-west of us as a strong node of the Long Wave Trough forms and stalls across the Bight.

This will project non-stop polar and mid-latitude fronts up through our south western swell window generating large levels of groundswell but with onshore winds through the weekend, possibly improving mid-late week as the swell starts to ease.

We'll have a closer look at this on Wednesday though.