Western Australia Surf Forecast by Craig Brokensha (issued Monday 25th May)

Best Days: Wednesday morning, Thursday, Friday, Saturday morning Perth and Gero

Recap

Poor conditions early Saturday around Margs with an onshore change, while Perth was clean but tiny. A new long-range SW groundswell filled in through the day and then eased from a cleaner 3-4ft in the South West Sunday morning with tiny waves around Perth.

Today a new SW groundswell started to build across the coast with early variable winds in the South West, but these have since gone onshore as the swell became larger. Perth was tiny and clean but is now a bit bigger with a light onshore wind.

This week (May 26 - 29)

Today's kick in SW groundswell should ease back through tomorrow, but a new short-range SW swell will take its place, generated by a frontal system currently pushing up and towards us. This system should cross us through early tomorrow, with the surf remaining in the 6ft range on the sets around Margs with 2ft waves in Perth and 3-4ft surf up at Gero.

Conditions will be poor though with a fresh S/SW wind, that should swing S/SE later in the day around Margs, cleaning up conditions in protected spots.

Wednesday should be nice and clean if not a little lumpy with a light offshore E'ly breeze, tending more onshore into the afternoon. The SW swell should ease from the 5-6ft range in the South West with 2ft sets in Perth.

Our large S/SW groundswell due into Thursday is still on track, with a vigorous polar low currently just south of Heard Island, generating a fetch of storm-force W'ly winds.

This low will be projected north-east towards the Bight over the coming days, under the influence of the Long Wave Trough while continuing to generate a fetch of severe-gale to sub-storm-force SW winds through our swell window.

A large and powerful long-period S/SW groundswell will be created, arriving dawn Thursday in the South West and building rapidly towards a peak during the middle of the day to 10-12ft across exposed breaks. Perth should kick to a solid 3ft on the sets into the afternoon with a late pulse to 5-6ft up at Gero.

The swell will then ease through Friday from 6-8ft in the South West and 2-3ft up at Perth and 5-6ft around Gero,

Winds are looking Good but not great for Thursday and then great as it ease Friday. Margs should see SE tending S/SE winds Thursday with E/SE tending SE winds around Perth, while Friday should be excellent with straight offshore E'ly winds that are due to give into weak sea breezes.

This weekend onwards (May 30 onwards)

The surf will continue to ease away into the weekend with favourable winds each morning for Perth and Gero, but Margs looks dicey with a weak trough bringing onshore winds both Saturday and Sunday. There may be a period of variable breezes through the morning, but we'll review this on Wednesday.

Longer term there's some new SW swell due into next week, but check back here Wednesday for the latest update.