Breaking: “Giant hail” is coming for Sydney’s suburbs, the BOM says.

A potentially damaging storm, including “giant hail” is coming for Sydney.

The radar shows massive storms moving towards populated areas of Sydney.

The Bureau of Meteorology warns that, at 4:10 pm, very dangerous thunderstorms were detected on the weather radar near Camden and Oran Park. These thunderstorms are moving towards the east. Very dangerous thunderstorms are forecast to affect Campbelltown, Leppington and Minto by 4:40 pm and Holsworthy, Liverpool and Macquarie Fields by 5:10 pm.

Other severe thunderstorms were detected on the weather radar near Nattai and Oakdale. They are forecast to affect the Penrose State Forest by 4:40 pm and Menangle, the area west of Berrima and Bundanoon by 5:10 pm.

Heavy rainfall that may lead to flash flooding, large, possibly giant hailstones and damaging winds are likely.

The State Emergency Service advises that people should: 
* 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. 

The next warning is due to be issued by 5:10 pm.

A more general severe thunderstorm warning is also current for the Illawarra and parts of the Metropolitan, South Coast, Central Tablelands and Southern Tablelands districts.

Warnings are also available through TV and Radio broadcasts, the Bureau’s website at www.bom.gov.au or call 1300 659 218. The Bureau and State Emergency Service would appreciate warnings being broadcast regularly.

Earlier: Flash flooding for Sydney