THE Bureau of Meteorology has issued a severe thunderstorm warning for people in Maitland, Cessnock, and the Greater Newcastle area.
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The warning was for large hailstones, heavy rainfall and damaging winds.
An upper level trough over eastern parts of NSW is assisting thunderstorm development.
The Bureau of Meteorology warns that, at 3.40 pm, severe thunderstorms were detected on the weather radar near Mangrove Creek Dam, the Putty/Howes Valley district, the Wollemi National Park west of Putty and Howes Valley (on the Putty Road).
These thunderstorms are moving towards the east to northeast.
They are forecast to affect Dooralong, Wollombi and the Watagan Mountains west of Cooranbong by 4.10 pm and Budgewoi, Warnervale and Lake Macquarie by 4.40 pm.
Large hailstones, heavy rainfall that may lead to flash flooding and damaging winds are likely.
At St Albans, 41mm fell in the 30 minutes to 3pm.
The State Emergency Service recommends that people move their car under cover or away from trees; secure or put away loose items around their house, yard and balcony; and keep at least 8 metres away from fallen power lines or objects that may be energised, such as fences.
People should also 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 their power bill.
Keep clear of creeks and storm drains, and do not walk, ride bikes or drive through flood water.
If you are trapped by flash flooding, seek refuge in the highest available place and ring triple zero (000) if you need rescue.
Other recommendations include unplugging computers and appliances.; avoiding phone use during the storm; staying indoors away from windows, and keeping children and pets indoors as well.
For emergency help in floods and storms, contact the SES (NSW and ACT) on 132 500.
