Parts of western Sydney and outer metropolitan areas were hit by severe thunderstorms on Tuesday afternoon after a warning was issued for damaging winds, hail and flash flooding.

The Bureau of Meteorology issued a warning at about 3.15pm on Tuesday that indicated that parts of the Blue Mountains, Wollongong and Sydney areas were expected to be affected as a result of thunderstorm cells and a low frontal system that was sweeping across the state.

Parts of Penrith and Marsden Park were hit with large hail stones along Springwood and areas of the Blue Mountains.

Meteorologist Jordan Notara said that there was a chance of thunderstorms later in the week, and that showers would persist into Wednesday morning.

“At this point, we won’t be seeing a complete clearance until that system comes through,” Notara said. “However, that is not going to be the end of it. Wednesday afternoon there will still be all the ingredients to see thunderstorms in the metropolitan, Illawarra and eastern parts of the state.”

Notara said that people living in built-up metropolitan areas should remain vigilant in the coming days because flash flooding was likely in areas with poor drainage.

“By Thursday afternoon it will start to clear, but showers will be persistent because of the south-easterly air stream. Further on for Friday and into the weekend we will still see showers on the forecast.”

The forecasts are just the latest in a spate of bad weather that has persisted in NSW over the past few weeks. It comes less than a week after a five-year-old boy died in floodwaters after the vehicle he was travelling in was washed away.