Storm season has begun in earnest in NSW, with much of the state's coast warned to prepare for severe thunderstorms.
A deep low pressure system pushing in from the west has the potential to bring damaging winds, large hailstones and heavy rainfall to the seaboard between Grafton and Bateman's Bay, the Bureau of Meteorology says.
Flash flooding is also possible in some locations.
"It will be a little bit hit or miss. Storms often tend to change track as they move towards the coast," BOM's David Wilke said.
"We have a very changeable, dynamic situation so the best bet is really to just keep an eye on the radar."
The storms will stretch inland too, with Armidale, Tamworth and Goulburn also in the firing line.
Residents in Goulburn have already reported 3cm hail stones.
Early morning thunderstorms have also already deposited up to 30mm of rain on parts of Canberra, with more likely Thursday evening.
Australian Associated Press