Search resumes for missing WA bushwalker

A search for a missing bushwalker in Western Australia's Pilbara has resumed with more than 50 people now looking for Felicity Shadbolt.

The 36-year-old is missing in the Mount Nameless area where she walks regularly.

She failed to return from one of those treks on Sunday.

Thirteen officers from Tom Price and Karratha police are leading the search with aerial support.

About 20 State Emergency Service volunteers and another 20 community volunteers are also involved.

Ms Shadbolt is about 150cm tall, of slim build and has blonde hair which is braided in two ponytails.

She is believed to be wearing blue pants and a black T-shirt and is carrying a light blue backpack.