The Bureau of Meteorology said reports of damage stretched 25 to 30 kilometres, with the path running roughly north-west.
Agata Imielska, bureau manager for NSW and ACT, said at least some of that damage was due to a tornado occurring.
She said tornadoes in general were “pretty rare” and localised at an even smaller scale than thunderstorms.
“We generally need to see damage that’s associated with them and observe the actual tornado, that really aids in being able to say yes, we’ve definitely, actually seen a tornado,” Ms Imielska said.
“There are other types of really localised systems, like a microburst. These, like tornadoes, tend to be associated with severe thunderstorms and conditions that we see.”
One man, believed to be aged in his 40s, was assessed for an arm injury after the tornado destroyed a property at Meadow Flat, near Lithgow. He was taken to Orange Hospital in a stable condition.
In Clear Creek, one male suffered cuts to his face while a female patient had sustained back and neck injuries. She was taken to Bathurst Hospital in a stable condition.
NSW Ambulance Inspector Meah Ferguson said the woman was lucky to have escaped with relatively minor injuries.
“It’s not every day you get called out to a tornado and this one packed quite a punch,” she said.
In Sydney, hail stones of up to two centimetres in size were reported on Thursday afternoon in Castle Hill and Pennant Hills.
Thunderstorms redeveloped over Parramatta on Thursday night, moving towards the south-east.
Severe thunderstorms are again forecast to hit parts of the state on Friday, marking the third day of damaging storms. The bureau said there would be unsettled conditions, but storms were unlikely to be as “dramatic” as those that hit on Thursday.
Bureau of Meteorology forecaster David Wilke said severe thunderstorms are possible on Friday over the state’s north-east, including Sydney.
“The system that has brought pretty wild conditions over the past couple of days is still at play,” he said. “We still have that trough sitting over eastern NSW.
“There is still the risk we could see significant phenomena through the afternoon.”
The bureau received reports of “pea-sized” hail over the Central Tablelands, including the regional city of Orange, on Friday afternoon.
Mr Wilke said the risk of severe thunderstorms would not ease until the trough moves offshore on Saturday.
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