Source: Bureau of Meteorology

For people in the South Coast, Southern Tablelands, Central West Slopes and Plains, Upper Western and parts of the Northern Rivers, Mid North Coast, Illawarra, Central Tablelands, South West Slopes, Riverina, Lower Western, Snowy Mountains, Australian Capital Territory and Northern Tablelands Forecast Districts.

Issued at 3:35 pm Monday, 20 March 2017.

Severe thunderstorms are likely to produce heavy rainfall that may lead to flash flooding in the warning area over the next several hours. Locations which may be affected include Lismore, Grafton, Orange, Goulburn, Walgett, Parkes, Cobar, Bourke and Lightning Ridge.

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.