Java, Bali, Lombok, Sumbawa forecast by Craig Brokensha (issued Tuesday 2nd June)

Best Days: Thursday onwards

This week and next week (Jun 3 - 12)

Easing surf from the weekend will continue through this afternoon, bottoming out into tomorrow morning.

The surf should start to build again through Thursday as a long-range and very inconsistent SW groundswell fills in, generated south-west of South Africa and Madagascar last week.

This should build to a very infrequent 5-6ft across exposed breaks later in the day Thursday and then hold a similar size into Friday morning.

Some larger S/SW groundswell is then due into later Friday afternoon/evening and more so Saturday ahead of a secondary pulse through Sunday.

This is related to a strong node of the Long Wave Trough currently moving through the southern Indian Ocean, directing an elongated and vigorous polar frontal progression through our swell window. A substantial fetch of severe-gale W/SW winds will generate two pulses of S/SW groundswell, the first for later Friday and more so Saturday to 8ft to occasionally 10ft across exposed breaks, before a secondary longer-period S/SW groundswell for Sunday to a similar size.

Fresh to strong E/SE trades are also due to kick in from tomorrow afternoon, favouring protected spots which will be a touch smaller than the exposed breaks mentioned above.

The weekend's S/SW groundswells should drop away into early next week but this will be softened by continued but weaker polar frontal activity south-west of WA.

The strongest of these trailing fronts through Thursday and Friday should generate a reinforcing S/SW groundswell for Wednesday morning to 6-8ft across exposed breaks again.

A drop in size is then due into the end of the week, with a long-range and long-period SW groundswell signal on Thursday, slowing this trend. The trades should persist but weaken a touch into the end of next week, but we'll have another look at this on Thursday.

16 day Bali Forecast Graph
16 day East Java Forecast Graph
16 day Sumbawa Forecast Graph