Authorities are growing in confidence that they are starting to gain the upper hand on a huge bushfire that has been threatening a string of coastal communities north of Perth.

The large coastal bushfire has been burning since Monday and authorities are preparing for more ‘very challenging’ conditions.

The volunteer aged in his 60s was at the scene of the fire near Wedge Island which is about 150km north of the city when he was injured. He was flown to Fiona Stanley Hospital in a stable condition yesterday afternoon.

After an evacuation order was issued for Cervantes last night, firefighters working to protect the town are expected to face tricky conditions today.

An evacuation warning remains in place as an enormous bushfire bears down on the town of Cervantes on the coast of Western Australia.