A SEVERE thunderstorm warning has been issued for Orange with heavy rainfall predicted.
The Bureau of Meteorology said heavy rain may lead to flash flooding in the warning area over the next several hours.
Other locations which may be affected include Bathurst, Parkes, Young, West Wyalong and Cobar.
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.