FIRE and health authorities in Western Australia have both been placed on red alert as Perth braces for its hottest day in more than five years on Saturday.
Temperatures in the city are tipped to soar past 44C, with outlying metropolitan suburbs warned to expect even more intense heat over the weekend.
With catastrophic fire conditions to stretch from the Pilbara to the south west, bushfire brigades across the state have been told to prepare for the worst.
Deputy Commissioner Lloyd Bailey, from WA's Department of Fire and Emergency Services, said volunteer firefighters have been rostered on all weekend, and extra water bombers have been placed on stand-by.
"We ask people not to just lock themselves up with the air-conditioning, but be cognisant of what is going on around them," Deputy Commissioner Bailey said.
The elderly, those with young children and babies and tourists who might not be used to the heat have been particularly warned of the potential effects of the heat.
"Although we are used to the heat, it is very important not to become complacent," said Dr Revle Bangor-Jones, Director WA Health's Disaster Management Unit.
"It is very important to keep the hydration levels up, and recognise any signs in the body that you are overheating.
Dr Bangor-Jones said emergency departments around the city were all on stand-by for an influx of heat victims.
Symptoms include dry, red, hot skin, high body temperature, nausea, and rapid heart rate.
St John's Ambulance advised anyone suffering from heat stroke should have cold packs or wrapped ice applied to their neck, groin and armpits, or be covered with a wet sheet while emergency services arrive.
In anticipation of the scorching heat, the scheduled race meeting at Ascot in the city was postponed until Sunday.
Perth Zoo distributed monster icy poles to its animals as the heatwave gripped the city, with even the otters enjoying icy poles made from whitebait, blue bait, prawns and mussels.
Even fortunate pool and spa owners were being warned to take precautions, with a reminder to ensure water was properly treated so swimmers avoid catching amoebic meningitis, which thrives in water temperatures between 28 and 40 degrees.
The scorching temperatures will arise as a pocket of very hot air, which has subjected the Pilbara to intense heat this week, begins to move south.
Onslow has suffered through two successive days over 40C, with Paraburdoo topping 40C by 9.30am on Friday.
Mike Burgin, regional director from the Bureau of Meteorology, said Saturday was likely to be Perth's hottest day since Boxing Day, 2007.
"And Perth certainly won't be the worst of it. To the north-east of the city we will get temperatures up to 46, 47 degrees," he said.
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