A severe thunderstorm warning has been issued for parts of NSW this afternoon.
The Bureau of Meteorology has warned that we can expect heavy rainfall, damaging winds and large, possibly giant hailstone.
The storm will impact people in parts of Blue Mountains/Hawkesbury, Wollondilly/Wingecarribee and Greater Wollongong areas.
The Bureau of Meteorology warned that, at 3:10 pm, very dangerous thunderstorms were detected on the weather radar near Blackheath and Katoomba.
Very dangerous thunderstorms are forecast to affect the Mount Tomah Botanic Gardens, Hazelbrook and the Grose Valley in the Blue Mountains by 3:40 pm and Blaxland, Springwood and Bilpin by 4:10 pm.
Other severe thunderstorms were detected on the weather radar near the area west of Berrima, Moss Vale and the Stroud district.
They are forecast to affect Bowral, High Range and Robertson by 3:40 pm and Kiama, Lake Avon and Hill Top by 4:10 pm.
Heavy rainfall that may lead to flash flooding, damaging winds and large, possibly giant hailstones are likely.
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 on 131 388, or Endeavour Energy on 131 003 or Essential Energy on 132 080, as shown on your power bill.
- 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.