A large NSW firebombing aircraft has been moved closer to the Victorian border as the state faces the most dangerous day of the bushfire season so far.
Total fire bans are in place until midnight in all regions of Victoria except East Gippsland.
Temperatures in the mid-to-high 30s and northwesterly winds gusting to 100km/h are buffeting the state, prompting a severe weather warning from the weather bureau.
Melbourne will likely get a top of 33C and maximums will peak in the high 30s across the north, with 39C expected in Mildura.
An extreme fire danger warning has been issued for the Mallee, Wimmera, Northern Country and North Central districts, the Bureau of Meteorology says.
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The NSW Regional Fire Service has moved its large air tanker, Thor, to Albury near the Victorian border due to the increased fire danger.
The Warrandyte State Park, Woodlands Historic Park and Organ Pipes National Parks have been closed by Parks Victoria.
The CFA said there are two tree fires burning in Willow Grove and Maffra, but they are small and not spreading.
