THE Bureau of Meteorology has issued a thunderstorm warning for eight NSW weather forecast districts, including parts of the Upper Hunter.
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The Bureau said large hailstones, heavy rainfall and damaging wind is possible.
Areas included in the Bureau's yellow warning zone are Scone and Murrurundi to the north, and further west through Denman, Sandy Hollow, Merriwa and Cassilis.
BoM said flash flooding may occur in some weather forecast districts over the next several hours.
Areas likely to be affected outside the Hunter include Lismore, Grafton, Port Macquarie, Taree, Armidale, Bathurst, Tamworth, Gunnedah, Moree, Narrabri, Walgett and Lightning Ridge.
The Bureau said heavy falls have already been recorded in a short space of time in the Northern Rivers, where 43mm of rain fell in 30 minutes between 3:30pm and 4:00pm at Brays Creek on Tuesday.
On the Mid-North Coast, 32mm of rain fell in 30 minutes between 3:35pm and 4:05pm at Girralong.
The Bureau will issue an updated warning around 8pm on Tuesday night.
If hail, heavy rain and damaging winds are forecast, the State Emergency Service (SES) always advises residents to do the following:
- move their car under cover or away from trees;
- secure loose items around the house, yard and balcony;
- keep clear of fallen power lines;
- unplug computers and appliances;
- avoid using the phone during the storm;
- stay indoors away from windows; and
- keep children and pets indoors.
