Source: Bureau of Meteorology

For people in parts of South Coast, Southern Tablelands, South West Slopes, Riverina, Snowy Mountains, Australian Capital Territory and Central West Slopes and Plains Forecast Districts.

Issued at 3:17 pm Monday, 20 November 2023.

Severe thunderstorms developing about the south of the state.

Weather Situation: A northeasterly airstream will draw moisture into the state, with a deepening inland trough aiding the development of severe thunderstorms in NSW today.

Severe thunderstorms are likely to produce heavy rainfall that may lead to flash flooding and large hailstones over the next several hours in parts of the South Coast, Southern Tablelands, South West Slopes, Riverina, Snowy Mountains, Australian Capital Territory and Central West Slopes and Plains districts. Locations which may be affected include Cooma, Griffith, Gundagai, Tumut, Junee and Darlington Point.

Severe thunderstorms are likely to produce heavy, locally intense rainfall that may lead to dangerous and life-threatening flash flooding and large hailstones over the next several hours in parts of the South West Slopes and Riverina districts.

32.4 mm of rainfall recorded at Muttama in the 30 minutes to 03:09 pm.

The State Emergency Service advises that people should:
* Move your car under cover.
* 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.
* Be aware that run-off from rainfall in fire affected areas may behave differently and be more rapid. It may also contain debris such as ash, soil, trees and rocks.
* After bushfires, heavy rain and the loss of foliage can make the ground soft and heavy, leading to a greater chance of landslides.
* Unplug computers and appliances.
* Avoid using the phone during the storm.
* Stay indoors away from windows, and keep children and pets indoors as well.
* Stay vigilant and monitor conditions. Note that the landscape may have changed following bushfires.
* For emergency help in floods and storms, ring the SES (NSW and ACT) on 132 500.