Java, Bali, Lombok, Sumbawa forecast by Craig Brokensha (issued Tue 10th Jun)

Best Days: Wednesday morning exposed spots, Thursday, Friday and Saturday out of the trades, Sunday onwards at exposed spots again

This week and weekend (Jun 10 - 15)

An afternoon increase in groundswell should have been seen yesterday and this swell is due to be on a slow downwards trend from a peak early this morning. Winds looked as if they were variable with the trades backing off, opening up more exposed locations for business. We should see a moderate trade-wind kick in through this afternoon though with the dropping swell.

A further drop in size is due tomorrow ahead of a new large SW groundswell on Thursday. This swell was generated over the weekend by a vigorous polar front pushing up towards WA, with that state currently seeing the swell pushing in at 6-8ft, and more size is due into the afternoon.

The swell should arrive across our coasts on Thursday and peak through the afternoon to 6ft to occasionally 8ft at exposed breaks around Bali, with smaller waves in more protected locations. Locations further east towards Sumbawa can expect less size to 6ft or so.

A drop in size is then due through Friday from 5-6ft+ at exposed locations early around Bali. Trade-winds are expected to freshen from the E/SE as the swell kicks Thursday and persist into Friday before easing off slowly through the weekend (likely becoming variable Sunday morning).

Through the weekend, the easing SW groundswell will be replaced by a new long-range S/SW groundswell and this should soften the easing trend through Saturday with exposed spots around Bali holding around 3-5ft.

From Sunday though the swell will drop away from 4ft or so, with smaller surf due into Monday.

Next Monday onwards (Jun 16 onwards)

There's nothing too major on the cards for the first half of next week with small to medium levels of SW groundswell due to pad out the region until Thursday afternoon.

On the upside winds are due to tend light and variable opening up better options at exposed breaks.

Into the end of the week we could see a large and long-range SW groundswell moving in, generated by a vigorous and prolonged polar frontal progression from south-east of South Africa all the way across to the Heard Island region during the second half of this week and into the weekend.

This is still a long way down the track though, so check back here on Thursday for an update on this.

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