Source: Bureau of Meteorology

For people in parts of Blue Mountains/Hawkesbury, Wollondilly/Wingecarribee and Greater Wollongong areas.

Issued at 4:59 pm Friday, 31 October 2025.

Severe thunderstorms have developed on and east of the ranges.

The Bureau of Meteorology warns that, at 4:35 pm, severe thunderstorms likely to produce large hailstones and heavy rainfall that may lead to flash flooding were detected near Moss Vale and the Yengo National Park northwest of St Albans. Significant accumulations of small hailstones are also likely. These thunderstorms are slow moving. They are forecast to affect Robertson and Kangaloon by 5:05 pm and Bowral, St Albans and Berrima by 5:35 pm.

The State Emergency Service advises that people should:
* Move your car under cover.
* 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.