Police say harsh conditions are making the search for a man missing in far north Western Australia "very difficult".

Mark Sear, 62, was last seen driving a white tray-top truck near Moola Bulla Station, 80 kilometres north of Halls Creek in the Kimberley on September 19.

The vehicle was found bogged in a dry riverbed near the Great Northern Highway at Sandy Creek six days after he was last seen.

Kimberley Superintendent John Hutchison said the truck contained an esky with refreshments inside.

"We're not really sure what he had in his possession when he walked away from the vehicle," he said.

Superintendent Hutchison said searchers had identified a "number of footprints" in the area but were unable to confirm whether they were Mr Sear's.

Superintendent Hutchison said the aerial and

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