· Perth swelters, Melbourne, Adelaide next

An out-of-control grassfire could impact towns around the Trawalla area in central Victoria, fire authorities say.

An emergency warning has been issued for Brewster, Chepstowe, Mount Emu and Mena Park.

These areas could be impacted any time within the next two hours, the CFA said at 1600 AEDT on Monday.

#Trawalla fire has now been upgraded to an emergency warning for those in the Brewster, Chepstowe, Mount Emu, Mena Park areas.

— PRIME7 News SW Vic (@PRIME7SWVic) January 13, 2014

It says a fast-moving, out-of-control grassfire is travelling in a south-westerly direction from Trawalla East Road towards Carngham-Streatham Roads/Morchup-Mount Emu Roads between the Trawalla West Road, North and South Road and Kayleys Lane.

Spot fires and ember attacks are starting up to 500 metres ahead of the main fire.

The grassfire is burning near Trawalla, located about 40km west of Ballarat.