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Emergency ACT Fire Downgraded But Danger Not Over

Dangerous fire conditions are expected to linger in the ACT as parts of Australia brace for a heatwave, with temperatures expected to soar into the 30s.

The ACT will be choked with smoke hailing from fires burning south of Canberra, as firefighters prepare for a day of dangerous conditions.

An emergency fire in Orroral Valley was downgraded to Watch and Act overnight after razing more than 8000 hectares.

It's believed heat from a helicopter landing light may have sparked the fire.

"It is deeply regrettable that our support operations have likely started this fire," a statement on Tuesday from the Department of Defence said.

"Defence has taken immediate action to reduce the risk of fires being started by helicopters, including not using certain aircraft lighting in extreme weather conditions."

National

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Dire Warning As ACT Faces Worst Fire Emergency Since 2003 Crisis

Residents in the nation's capital are bracing for dangerous fire conditions over the coming hours as an out-of-control fire threatens lives, with some communities told it's too late to leave.

An emergency-level fire in Namadgi National Park. Image: AAP

Firefighters will continue to battle the blaze today as Canberra experiences sweltering temperatures of up to 36 degrees.

Adelaide is also bracing itself for a day of extreme heat, with the city facing temperatures of 38 degrees -- the hottest forecast across the country.

Hot weather is forecast across the country. Image: AAP

A fire warning is also in place for parts of Western Australia including the West Pilbara Coast, Goldfields and Esperance Shire Inland.

As of 7am (AEST) there was a Watch and Act warning for the Shire of Jarrahdale.

"Very hot conditions ahead of the trough with fresh and gusty northeast to northwesterly winds tending fresh and gusty southeast to southwesterly in the wake of the trough," the Bureau of Meteorology warned.

Sydney will experience warm temperatures in the high 20s, with NSW Rural Fire Service warning there is "high to very high" fire danger across the state.

"Be prepared for forecast higher temperatures later in the week that will see elevated fire danger," NSW RFS wrote on Twitter.

While Brisbane will be sunny on Wednesday, BOM has issued an alert for damaging winds of more than 90 km/h and heavy rainfall for northern Queensland.

"Heavy rain, which may lead to flash flooding, is likely about the Gulf Country... Move your car under cover or away from trees [and] beware of fallen trees and powerlines," BOM said.

Contact Eden at egillespie@networkten.com.au