Almost 130 bush and grass fires are currently burning around NSW after widespread thunderstorms sparked blazes across the state.
The Rural Fire Service NSW on Wednesday said 129 fires were burning in NSW, with 66 uncontained and more than 1800 firefighters in the field.
One persistent blaze on Myall Creek Road at Bora Ridge, south of Casino, is currently at "watch and act" level after an overnight southerly wind change pushed the fire north and impacted the Pacific Highway.
The highway remains closed between Jacky Bulbin Flat and New Italy.
Total fire bans are in place in the New England and Northern Slopes regions on Wednesday due to very high fire danger.
The Bureau of Meteorology said thunderstorms which hit Sydney on Tuesday afternoon and the state's northeast in the evening had produced large hailstones and damaging winds, while lightning also sparked new fires.
Building impact assessment teams from the RFS continue to investigate damage in fire grounds across the state.
Some 663 homes have been destroyed in bushfires this season and six people have died.