Damaging winds , hailstones and severe thunderstorms were predicted to hit Sydney 's far west as well as the Hunter , Illawarra and Central Tablelands regions on Thursday evening . The Bureau of Meteorology said a severe storm swept through Springwood , Bilpin and the Yengo National Park in the Blue Mountains on Thursday evening before heading north . Photos on social media show large hailstones raining on residents in the Blue Mountains , described as 'sheets of ice ' by local Shannon King on Twitter . Photos on social media show Blue Mountains residents holding up large hailstones in the wake of the severe storm . Jacki Allen uploaded this image of several large hailstones found in Faulconbridge . ' I have some small dents in my car but animals ( are ) ok , ' Ms King said . Large hail was reported at Faulconbridge on the lower Blue Mountains at about 7pm . Faulconbridge resident Andrew Ballard said on Twitter the hail was 'twice the size of golf balls , ' reports ABC . The Bureau previously warned the hail , severe winds and heavy rainfall could lead to flash flooding . The Bureau of Meteorology said a severe storm swept through Springwood , Bilpin and the Yengo National Park in the Blue Mountains . The storms come after wild weather lashed Sydney 's west and south on Wednesday evening . More than 20,000 homes lost power when heavy rainfall , damaging winds and lightning rolled through after 7pm . A Bringelly family was forced to leave their home when their roof collapsed , while another piece of roof blew onto train tracks at Mount Druitt . Faulconbridge resident Amy Margaret Thorpe uploaded the following image following the wild thunderstorm on Thursday evening . Faulconbridge , situated on the lower Blue Mountains , was the area worst hit by the storm .
Damaging winds , hails and thunderstorms lashed the area on Thursday . Photos on social media show large hailstones raining on residents . A severe storm swept through the Blue Mountains before heading north .