SURF Life Saving NSW is warning swimmers, surfers, boat skippers and rock-fishers about dangerous surf conditions from the Victorian border to mid-north coast, mainly on Thursday.
Surf Life Saving support operations and emergency callout teams are on high alert following the deaths of two surfers in the last week in NSW.
A south-easterly swell is expected to reach 3-4 metres at its peak, with a long swell period of around 12-14 seconds.
These conditions will be hazardous for coastal activities such as swimming, surfing and rock fishing.
Conditions are expected to ease on Friday.
“With the onset of these dangerous conditions, we strongly encourage swimmers to follow all safety warnings and avoid entering the water," Surf Life Saving NSW lifesaving manager Andy Kent said.
If witnessing an in-water emergency call 000.
For full details on which beaches are patrolled and patrol times during winter go to beachsafe.org.au, which is also available as an iPhone app.