Homes and lives are under threat from two bushfires burning in WA.

A watch and act alert has been issued for people in Ambergate Road, Queen Elizabeth Avenue, Doyle Road and Edwards Road in the southern part of Ambergate, in Busselton.

Authorities say the suspicious blaze started this afternoon between Queen Elizabeth Road and Doyle Road near the Ambergate Nature Reserve.

“There is a possible threat to lives and homes as a fire is approaching the area and conditions are changing,” the Department of Fire and Emergency Services says.

“You need to leave or get ready to actively defend.”

The bushfire has burnt 12 hectares and is moving slowly in a north-westerly direction towards the intersection of Ambergate Road and Edwards Road.

DFES warns the blaze is out of control and unpredictable.

Burning embers are likely to be blown around and spot fires are starting ahead of the fire, the department says.

In a separate blaze, homes and plantations are being threatened by a bushfire burning near Carnarvon.

A watch and act alert has been issued for people in Miaboolya Road, Bibbawarra Road, North River Road and surrounding areas in the north-eastern part of Carnarvon, on the state's north coast.

DFES said the fire, which started this morning, could affect plantations along North River Road.

Residents have been advised to put their bushfire survival plan into action.

DFES says the out of control and unpredictable bushfire is moving slowly in a north-westerly direction along Miaboolya Road. Burning embers are likely to be blown around and spot fires could start ahead of the fire, DFES warns.

The cause of the blaze is unknown.

AAP

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