Storms have swept across Sydney, bringing giant hailstones, heavy rain and damaging winds.

A severe thunderstorm warning was issued in the morning, with the wild weather hitting the Blue Mountains and Penrith just after 8am.

“Very dangerous thunderstorms are forecast to affect Gordon, Mona Vale and Terrey Hills by 9:05 am,” according to the Bureau of Meteorology.

Image: Bureau of Meteorology

The severe warning was cancelled by 9.30am, but storms are still expected to continue across Greater Sydney for most of today.

Callers phoned in from across western Sydney as the storm swept in from the Blue Mountains.

Listener Wayne sent this photo from McGraths Hill in Sydney’s north-west.

A severe thunderstorm is currently heading east over the Northern Beaches. pic.twitter.com/K2gLGZanCo

— 2GB 873 (@2GB873) January 23, 2020

Listeners Sue, Darryl and Gloria all told Chris Smith about giant hailstones falling, powerlines coming down and flash flooding setting in.

The State Emergency Service (SES) has issued the following advice:

• Move your car under cover or away from trees.
• Secure or put away loose items around your house, yard and balcony.
• Keep at least 8 metres away from fallen power lines or objects that may be energised, such as fences.
• Report fallen power lines to either Ausgrid (131 388), Endeavour Energy (131 003), Essential Energy (132 080) or Evoenergy (131 093) as shown on your power bill.
• Keep clear of creeks and storm drains.
• Don’t walk, ride your bike or drive through flood water.
• If you are trapped by flash flooding, seek refuge in the highest available place and ring 000 if you need rescue.
• Unplug computers and appliances.
• Avoid using the phone during the storm.
• Stay indoors away from windows, and keep children and pets indoors as well.
• For emergency help in floods and storms, ring the SES (NSW and ACT) on 132 500.

Feature image: File photo (Instagram)