Large parts of NSW are in for a wet and stormy weekend, with leftover moisture from a tropical cyclone creating unstable conditions.
Thunderstorms have already begun rolling in over the northern ranges, around the Barrington Tops area, with the potential for severe storms over the central inland areas of the state later on Thursday.
"The greatest risk is that we may see damaging winds or heavy rainfall," the Bureau of Meteorology's Helen Kirkup said.
Friday will be more of the same, she says, with Sydney down to the south coast and west to the Riverina next in the firing line.
"With the thunderstorms, where they pass we could see some much heavier rainfalls, and some of this may be very intense and could lead to flash flooding."
"We're not ruling out the chance of large hail either."
Lingering moisture from Tropical Cyclone Lucas is combining with front create the system causing the havoc, which is expected to begin clearing out by Sunday.