Source: Bureau of Meteorology

For people in parts of Wollondilly/Wingecarribee and Greater Wollongong areas.

Issued at 6:13 pm Saturday, 25 December 2021.

Severe thunderstorms are occurring west of Wollongong. Heavy to INTENSE rainfall is possible.

The Bureau of Meteorology warns that, at 6:05 pm, very dangerous thunderstorms were detected on the weather radar near Appin and Bowral. These thunderstorms are slow moving. Very dangerous thunderstorms are forecast to affect Lake Cataract, Moss Vale and the area just east of Bowral by 6:35 pm and Darkes Forest, Lake Avon and Robertson by 7:05 pm.

Intense rainfall that may lead to dangerous and life-threatening flash flooding, large 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.