People in NSW are expected to get out and enjoy the forecast warm weather on Saturday, but the Bureau of Meteorology has warned severe thunderstorms will develop quickly in the afternoon.
Large parts of NSW could be hit with thunderstorms on Saturday afternoon and evening, with the potential for a supercell storm in the state's northeast.
The temperature is expected to be up to eight degrees above average.
However, BoM meteorologist Hugh McDowell warned the day could quickly take a turn.
"It's going to look nice, it's going to look like a decent day to get out and enjoy the weather with your family and friends," Mr McDowell said.
A cold front hitting the southeast could create a line of storms in the afternoon, with likely severe storms predicted for an area stretching from Dubbo to Coffs Harbour.
"It's a large area where thunderstorms are possible but not all areas are going to see thunderstorms and they won't all be severe," Mr McDowell said.
The severe thunderstorms could carry with them heavy rain, large hail and damaging winds.
Mr McDowell said people should keep an eye on the skies and BoM's social media accounts.
"If you see something brewing on the horizon have a look... there could be warnings, there could be a severe thunderstorm heading towards your location," Mr McDowell said.
Australian Associated Press