Western Australian Forecast by Craig Brokensha (issued Friday August 1st)

Best Days: Perth/Mandurah Monday and Tuesday mornings, Wednesday morning all locations, Thursday all locations

Features of the Forecast (tl;dr)

• Poor tomorrow with strong N/NW tending W-W/NW winds
• Large to extra-large, stormy mix of swells developing Sun with strong W/SW tending SW winds
• Slowly easing surf Mon with strong SW tending W/SW winds in the South West (likely variable to the north in the AM)
• Easing surf Tue with fresh W/SW tending weaker SW winds in the South West, variable offshore to the north in the AM
• Large SW groundswell Wed AM with E/SE tending S/SW winds
• Easing swell Thu with freshening E/NE tending N/NE winds

Recap

A reinforcing pulse of SW groundswell filled in yesterday providing a boost to 2-3ft in Mandurah, 2ft+ Perth during the afternoon and 6ft+ across Margs with favourable early conditions before winds increased and shifted more northerly.

This morning the swell was hanging in the mix across metro regions, a little smaller in the South West and early NE winds have since shifted more N’ly and strengthened.

This weekend and next week (Aug 2 - 8)

I hope you got a few waves over the last two days, as from the weekend we’ve got a large, stormy run of swell on the cards, not improving for the South West until the middle of next week.

Looking at tomorrow though and an approaching polar front al system will bring with it strong N/NW tending W-W/NW winds, with a small window of variable winds expected between wind shifts, though with no quality surf.

The frontal system is currently a polar low, forming around the Heard Island region last night, with it due to project a great fetch of storm-force SW winds towards us today and tomorrow.

The storm will then cross the coast Sunday, bringing with it strong W/SW tending SW winds and a mix large to extra-large, stormy windswell and developing groundswell energy.

The peak in groundswell from the storm-force winds is expected Monday, though regardless, Sunday looks to come in at a stormy 15ft+ into the afternoon across Margs, 4-6ft Mandurah and 3-5ft Perth.

Monday will be a touch smaller in size (still XL in the South West) but stronger in period, with strong SW tending W/SW winds due across the South West, with a possible window of variable winds around Perth/Mandurah through the morning.

Mandurah looks to ease back from 4-5ft with 4ft waves in Perth, smaller Tuesday as winds remain onshore from the W/SW tending SW in the South West, variable again to the north.

Come Wednesday, winds are due to finally ease off and swing light E/SE across the South West and swell wise, a new pulse of SW groundswell is due.

This should be generated by a strong polar frontal progression firing up east of the Heard Island region this weekend, projecting towards us while weakening.

The South West should come in at 10ft with 3ft+ sets in Mandurah, 2-3ft Perth, easing through the day and smaller again Thursday under great, fresh E/NE tending N/NE winds.

Longer term the outlook is slower so make the most of the windows of improving to great surf next week. Have a great weekend!