Western Australia Surf Forecast by Craig Brokensha (issued Wednesday 6th September)

Best Days: Swell magnets tomorrow and Friday, Perth and Mandurah Monday morning, all locations Wednesday morning

Recap

Pumping waves across the South West yesterday with clean surf in the 6ft+ range across the reefs with offshore winds. Mandurah eased back to 2ft, with inconsistent 1-2ft waves around Perth.

This morning the swell was much smaller with tiny leftovers to the north and clean inconsistent 3ft waves around Margs.

This week and weekend (Sep 7 - 10)

The surf will remain on the small to tiny size through tomorrow, similar to today, with a slight bump Friday to 3-4ft in the South West, still tiny and to 1ft to the north.

Conditions will be great most of tomorrow with a an E'ly tending variable breeze and then E/NE tending variable winds Friday.

Winds go funky into Saturday with an approaching front, but variable breezes are more than likely, tending fresh W/NW through the afternoon. The swell will remain small and inconsistent.

As touched on last update, the first of a series of large groundswells are due from Sunday and more so Monday, with a strong node of the Long Wave Trough due to develop across the Indian Ocean.

We'll see a strong and broad polar low generating a fetch of gale to severe-gale W/SW winds, producing a large SW groundswell for Monday. An initial pulse should be seen Sunday afternoon, building to the 6ft range on the sets in the South West and 1-2ft around Perth and Mandurah, with the best pulse Monday coming in around 8ft across the South West and 2ft+ further north.

Winds will be poor though as a front from the low pushes up and into us, bringing W/NW tending S/SW winds Sunday and W/NW winds on Monday. Perth and Mandurah are likely to see more variable winds Monday morning though.

A secondary stronger mid-latitude front is expected to fire up through our swell window Sunday, generating a great fetch of severe-gale W/NW winds through our swell window, producing a large SW groundswell for Tuesday afternoon, but again with onshore winds.

We may see offshores kicking back in Wednesday, but we'll look at this closer Friday.