Hobart swelters through hottest on record

HOBART has sweltered through its hottest day since records began in 1883.

The island capital hit 41.8C at 4.05pm (AEDT), smashing the previous high of 40.8C set in January 1976.

That record had stood since 1899, when the mercury hit 40.1C.

The searing heat came after residents tossed and turned their way through a record overnight January temperature - 23.4C.

Bureau of Meteorology senior forecaster Malcolm Downing said hot air from Western Australia and South Australia had not cooled as it was drawn across the Great Australian Bight.

"Although you may think that length of passage over the water is enough to cool it down, it only really produces very shallow cooling," he told AAP.

"So once it gets back over Tasmania it has a chance to mix up again and that hot air comes back down to the surface."

The temperatures and gusty winds of up to 90km/h were making it difficult for firefighters battling several big blazes across the state.

And in another freak of the weather, the rising heat from one fire east of Hobart had created its own thunderstorm, the bureau said.

Huge smoke plumes and thunderclouds were seen east of the River Derwent on Friday afternoon with lightning flashes created by the mini-storm.

A southerly change was expected to hit Tasmania late on Friday night, bringing little rain but a top temperature of just 26C for Hobart on Saturday.

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