5.40pm:
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A severe thunderstorm is predicted to affect Wombeyan Caves by 6:40 pm.
Large hailstones, heavy rainfall that may lead to flash flooding and damaging winds 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.
The next warning is due to be issued by 6.45pm.
Visit http://www.bom.gov.au for the latest information.
EARLIER:
The Bureau of Meteorology has issued a severe weather warning for hail, heavy rainfall and damaging winds.
The BoM warns that a line of thunderstorms were detected on the weather radar near the Taralga district (north of Goulburn), the Crookwell district and Wombeyan Caves.
These thunderstorms are moving towards the southeast. They are forecast to affect the area west of Berrima, the Penrose State Forest, Sutton Forest, Bundanoon and Wingello over the next hour.
Heavy rainfall that may lead to flash flooding is likely. Large hailstones and damaging winds are also possible.
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.
The next warning is due to be issued by 4.40pm.