Wild storms ravage Sydney

Wild storms have ravaged parts of NSW leaving trees down, sparking a house fire and keeping emergency services busy.

The State Emergency Service (SES) has logged about 420 jobs since the storms swept across the Sydney area on Saturday afternoon.

SES spokesman Dave Buchtmann said the south Penrith area in the city's west had been hard hit.

"And there is more storm activity coming through this afternoon," he said.

NSW Fire and Rescue (NSWFR) has also responded to calls for help with storm damage with trees down and fallen powerlines across the Sydney area.

Part of a medical centre's roof in Kingswood in Sydney's west has also been blown off by strong winds.

NSWFR Superintendent Tom Cooper said a fire started in a two-level house in Lansvale in the south-west after a lightning strike.

A woman in her 40s was inside at the time and felt a tingling sensation from the strike.

Firefighters have extinguished a blaze in the roof but are still working to put out other smouldering fires throughout the house.

The rain, damaging winds and lightning strikes are a stark contrast to the perfect weather conditions that saw many flock to the coast on Saturday morning.

The Bureau of Metrology (BOM) has issued a severe thunderstorm warning for the Sydney, Hunter, Illawarra districts and some western parts of the state.

Ironically firefighters are also battling 68 blazes burning across NSW, including a fire that burned over a cliff edge in the Blue Mountains.