Source: Bureau of Meteorology

For people in parts of Gosford/Wyong and Sydney areas.

Issued at 8:58 am Tuesday, 22 February 2022.

The Bureau of Meteorology warns that, at 9:00 am, severe thunderstorms were detected on the weather radar near Hornsby, Calga, Gosford, Woy Woy, Glenorie, Mangrove Mountain and Dooralong. They are forecast to affect Spencer, Baulkham Hills, Riverstone, Schofields, Mangrove Creek Dam and the Watagan Mountains west of Cooranbong by 9:30 am and Upper Mangrove, Richmond, Windsor, Blacktown, Londonderry and the area between Wollombi and Bucketty by 10:00 am.

Heavy rainfall that may lead to flash flooding is likely.

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.
* 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.