The Department of Fire and Emergency Services (DFES) said the situation had escalated and the towns of Harvey, Cookernup, Wokalup and surrounding areas could be hit within hours.
People in those areas are being urged to evacuate to the south, via the South Western Highway if it is safe to do so.
Police have been door-knocking in Harvey directing people to leave.
An emergency warning also remains in place for east of Waroona, Yarloop, Hamel, the Harvey town site and surrounding areas.
A separate bushfire is also threatening homes in the Dalyup area in the Shire of Esperance on WA's south coast. An emergency warning has been issued for people living south of the South Coast Highway.
DFES said the fire had reached Murray Road and was directly threatening homes at the southern end of the road.
People in the road's vicinity are being warned leaving now would be deadly and they must defend their homes or take shelter.
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