UPDATE: VICTORIANS have been urged to make sure they have their bushfire plan ready amid predictions of a heatwave this weekend.
Federal Emergency Management Minister Nicola Roxon warned people to get ready in case they were trapped by a fire.
Ms Roxon said people should know where they would go, what they would do with children and animals and what they needed to pack.
"We'll have a number of these days over the coming months. It is important to ask the community to think whether they have their plans ready if there is a fire risk," she said.
"Do they know what they're doing, have they already got a plan? Please, you can make yourself much safer, your family safer and you can make the work of the CFA easier if you are able to respond quickly if there's a risk."
Ms Roxon, who visited the Sunbury CFA yesterday, urged people who already had plans to refresh them.
She also promoted the new location-based mobile phone alert system being used by Telstra this summer.
Previous alert systems sent warnings only to landlines or mobile phones registered in a particular area.
The new system reaches phones if they are in a location at risk of a disaster such as fire, flood or cyclone.
Ms Roxon said the Government had put $60 million into the upgraded system.
Other phone companies are expected to have the service in the next 12 months.
Meanwhile, sweltering conditions are forecast for South Australia tomorrow with the mercury set to hit 40C early in the day.
Originally tipped to reach the high 30s, forecasters now say the temperature could get even higher before a massive cool change arrives tomorrow afternoon.
The change will bring the chance of isolated showers over southern coastal areas later in the day taking conditions down to a milder 26C ahead of Christmas.
Fine weather conditions are expected for Christmas Day and Boxing Day with temperatures expected in the mid-20s.