A severe thunderstorm warning has been issued for parts of the Illawarra.
A warning from the Bureau of Meteorology asks residents to prepare for heavy rainfall that may lead to flash flooding over the next several hours.
The most recent warning was issued at 3.36pm.
The State Emergency Service advises people:
* Move their car under cover or away from trees;
* Secure or put away loose items around their house, yard and balcony;
* Keep clear of fallen power lines;
* Don't walk, ride their bike or drive through flood water;
* Unplug computers and appliances;
* Avoid using the phone during the storm; and
* Stay indoors away from windows, and keep children and pets indoors as well.
For emergency help in floods and storms: SES, 132 500