Source: Bureau of Meteorology

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

Issued at 3:17 am Sunday, 18 January 2026.

Heavy rainfall has redeveloped about parts of Sydney and the Blue Mountains

The Bureau of Meteorology warns that, at 2:10 am, a severe thunderstorm likely to produce heavy rainfall that may lead to flash flooding was detected near Liverpool and Warragamba. This thunderstorm is moving towards the northwest. It is forecast to affect Glenbrook, the Jamison Valley, Katoomba, Horsley Park and Blaxland.

The State Emergency Service advises that people should:
* 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.
* Stay indoors away from windows, and keep children and pets indoors as well.
For emergency help in flood and storms, ring the SES on 132 500.
Stay updated on the Hazards Near Me NSW app or the ACT ESA website (https://esa.act.gov.au).