On Monday there was a minor but frustrating breakthrough in the search for a missing 87-year-old Perth man with dementia.
Alex Henderson, who is also deaf, hasn’t been seen since last Thursday.
The search zone stretches from Hillarys, where he lives, to Woodvale.
On Monday sniffer dogs picked up his scent, but then the trail went cold on Craigie Drive.
One theory is that Mr Henderson might have caught a bus to the Joondalup Shopping Centre, where the amateur nature photographer often went to buy supplies for his camera at Harvey Norman.
Another theory is that he went to look at wildflowers in the Pinnaroo Valley Memorial Park.
With no new sightings, police say time is now critical, as weather is forecast to worsen on Monday night.
Mr Henderson’s family is asking everyone in Perth’s northern suburbs to check their backyards and sheds in case he seeks shelter there.
If Mr Henderson is found, police ask for him not to be left on his own. Instead, stay with him and call police on 131 444.