Source: Bureau of Meteorology

For people in Mid North Coast and parts of Northern Rivers, Illawarra, South Coast, Southern Tablelands, North West Slopes and Plains, Snowy Mountains, Northern Tablelands and Hunter Forecast Districts.

Issued at 2:34 pm Monday, 21 April 2025.

Severe thunderstorms across parts of eastern NSW.

Weather Situation: An upper trough is moving through central and northeast parts of NSW and is destabilising the atmosphere, thereby aiding in thunderstorm development across eastern parts of the state.

Severe thunderstorms are likely to produce large hailstones and possible damaging winds over the next several hours in the Mid North Coast and parts of the Northern Rivers, North West Slopes and Plains, Northern Tablelands and Hunter districts. Locations which may be affected include Lismore, Armidale, Ballina, Casino, Kyogle and Dorrigo.

Severe thunderstorms are likely to produce large hailstones and possible heavy rainfall that may lead to flash flooding over the next several hours in parts of the Illawarra, South Coast, Southern Tablelands and Snowy Mountains districts. Locations which may be affected include Braidwood, Araluen, Nerriga and Captains Flat.

The State Emergency Service advises that people should:
* Move your car under cover or away from trees.
* Secure or put away loose items around your house, yard and balcony.
* Keep at least 8 metres away from fallen power lines or objects that may be energised, such as fences.
* Report fallen power lines to either Ausgrid (131 388), Endeavour Energy (131 003), Essential Energy (132 080) or Evoenergy (131 093) as shown on your power bill.
* Trees that have been damaged by fire are likely to be more unstable and more likely to fall.
* 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.