Bureau of Meteorology issues a severe thunderstorm warning for northern NSW and south-east Queensland which could cause floods 1200 homes blacked out in Epping Central Coast woman struck by lightning Three treated after powerlines fall in Engadine Hail in Port Macquarie A SEVERE thunderstorm warning has been issued for a vast stretch of NSW - from the Central Coast to the Queensland border - bringing the threat of flash flooding, hail stones and damaging winds. The Burea of Meteorology said a 106km/h gust has already been recorded at Murrurundi Gap near Scone in northern inland NSW at 11:30am. "Severe thunderstorms are likely to produce damaging winds and large hailstones in the warning area over the next several hours," the Bureau has warned. Hailstones on Town Beach at Port Macquarie. Picture: Port Macquarie Council/Twitter Source: Supplied Hailstones the size of golf balls have hit at Port Macquarie. Picture: Lauren Kelly/Twitter Source: Supplied Some of the big hailstones that hit Port Macquarie. Locations which may be affected include Lismore, Grafton, Coffs Harbour, Port Macquarie, Taree, Newcastle, Gosford, Armidale, Tamworth, Gunnedah, Moree and Narrabri. Bureau forecaster Michael Knepp said storms could also hit southern Queesland, and have the potential to be the worst of the season. As these photos show hail has already hit Port Macquarie in a big way. Not so tropical. Picture: Bel Morrison@belsbakery4m/‏Twitter Source: Supplied More hail covers a backyard in Port Macquarie. Picture: Kev T. ‏@truuebluu19m/Twitter Source: Supplied Bureau of Meteorology has warned of severe thunderstorms threatening a big chunk of northern NSW. Mr Knepp said a trough moving through the southern part of Queensland had created enough moisture in the air to cause potentially damaging conditions in southern Queensland and northern NSW. Closer to home, the Bureau said it would issue another warning this afternoon if Sydney is also under the threat of severe thunderstorms. Already more than 1200 homes and businesses around Epping, in Sydney's north-west, are without power as emergency crews work to restore the grid. Power has also been lost in 700 homes around Castle Cove and Roseville on the city's North Shore. Channel 9 is reporting that a woman on the Central Coast was struck by lightning on her arm but is conscious and breathing. Fire and Rescue NSW has already swung into action around Sydney while Ambulance NSW reports that it is treating three people after powerlines were brought down. A short time ago the Bureau of Meteorology issued a severe weather warning to people living in the Hunter. It said damaging wind gusts are forecast to approach 90km/h and advised people to take cover. "Move vehicles under cover or away from trees; Secure or put away loose items around your house, yard and balcony; Keep clear of fallen power lines," the warning reads.