A joint search involving a police dive squad, rescue helicopter and coastguard has failed to turn up any sign of a missing canoeist in the Grey River.
Nicholas Clive McAlister has not been seen since early on Saturday afternoon, and police now admit there's only a 50/50 chance he will be found alive.
The 32-year-old was out with his two children, and another man and his child, when their Canadian-style canoe overturned at the head of a rapid.
The four, eight and 11-year-olds swam ashore in their lifejackets; Mr McAlister was not wearing one and has not been seen since.
The West Coast Search and Rescue coordinator Sean Judd says nothing of significance was found on Sunday, before the weather began closing in at about 6pm.
He says the family of the missing man are deeply saddened that Sunday's search was unsuccessful.
Constable Judd says police will assess the river conditions after 8am on Monday, before deciding what direction the search will take.