Western Australia Surf Forecast by Craig Brokensha (issued Monday November 14th)

Best Days: South West magnets tomorrow morning, Perth and Mandurah Saturday morning, Sunday all locations, Monday all locations

Features of the Forecast (tl;dr)

• Easing mid-period S/SW swell tomorrow with fresh but easing E/SE tending E/NE winds ahead of a late S/SW change
• Small mid-period SW swell Wed with E/SE tending N then W winds
• Moderate sized S/SW swell building later Thu, peaking Fri with strong W/SW tending SW winds Thu, strong SW Fri
• Moderate sized + S/SW swell building Sat with strong but easing S/SW winds in the South West, E/SE for a period Perth and Mandurah
• Peak in S/SW swell early Sun with S/SE-SE tending SW winds, easing Mon with E/SE tending SW winds

Recap

The swell dropped in size with cross-shore S/SE winds on Saturday across the South West, cleaner yesterday morning with small waves, best suited to the swell magnets. Mandurah and Perth were tiny, wind affected on Saturday and cleaner yesterday but only for beginners.

Today we've got a fun pulse of new swell with fresh offshore winds, best across the South West magnets and to 4-5ft on the sets, but only 1ft in Perth and Mandurah.

Wind affected sets later this AM

This week and weekend (Nov 15 - 20)

Today's lift in mid-period S/SW energy will ease through tomorrow and conditions will be clean again through the morning, best on the South West magnets along with a fresh but easing E'ly tending E/NE offshore ahead of weak sea breezes and a late S/SW change.

This change will be linked to a trough projecting up towards us, with it lingering Wednesday and Thursday ahead of a stronger cold front and change on Friday.

The trough will be weak Wednesday allowing offshore winds to develop across all locations again in the morning, swinging N'ly into the afternoon and then W'ly later. Strong W/SW tending SW winds are then due into Thursday and Friday, along with some building mid-period S/SW swell.

Coming back to Wednesday and we should see another small pulse of mid-period SW swell for the morning, generated by an off-axis fetch of pre-frontal strong to near gale-force NW winds attached to a strengthening polar low, south-west of us. This only looks to generate a slow 3ft to possibly 4ft wave in the South West through the day, tiny to the north.

On the backside of the low, a better fetch of S/SW winds should generate a slightly better pulse of mid-period S/SW swell Thursday afternoon but with those onshore winds.

Of greater importance is some better, moderate sized + mid-period S/SW swell due into the weekend, generated by a secondary, stronger polar front projecting a fetch of strong to gale-force SW winds through our southern swell window Wednesday and Thursday. This front will weaken while approaching us, with the swell due to build through Saturday and peak Sunday morning.

At the peak of the swell, sets to 6ft+ are due in the South West, 2-3ft in Mandurah and Perth but with strong, easing S/SW winds in the South West, cleaner to the north and with a period of E/SE offshores.

Sunday looks cleaner around Margs with a lighter S/SE-SE offshore wind, E/SE to the north with the peak in size and power, easing through the day along with sea breezes.

Monday looks cleanest again with an E/SE offshore around Margs but easing S/SE energy from 4-6ft, slowed by a pulse of reinforcing S/SW energy, smaller and to 2ft in the north on the sets. Following this there's nothing too significant on the cards for the longer term, but we'll look at this in more detail on Wednesday.