Severe thunderstorms hit parts of northeast New South Wales and southeast Queensland on Tuesday, with further storms a chance today. A cold and unstable upper air mass combined with a low pressure trough to generate widespread thunderstorms across the region yesterday. Some of these thunderstorms were severe, with heavy rainfall and flash flooding the most prevalent feature. Casino in the NSW Northern Rivers copped quite a downpour, receiving 63mm to 9am this morning, with 30mm of this coming in just half an hour. Amberley in southeast QLD picked up a quick-fire 28mm, with 7mm coming in 10 minutes. Small hail was seen in some Brisbane suburbs, while golf ball size hail was reported south of Casino during the evening. Winds were quite strong and gusty in places, reaching up to 65km/h on the Gold Coast, although they were generally not strong enough to cause damage. Far northeast NSW and southeast QLD should see further thunderstorms today, although they are likely to be far more isolated as the trough weakens and the cold upper air moves east. Most storms should be confined to the ranges and QLD's Wide Bay and Burnett, with Brisbane a lesser chance to see a rumble today. Severe thunderstorms remain a risk, although they are also less likely than yesterday. A high pressure ridge will develop from Thursday, making thunderstorms unlikely, with only a possible on each day until the weekend.