Giant hail, strong winds and very heavy rainfall pounded parts of northern New South Wales and southern Queensland on Saturday, causing structural damage, flooding and damage to crops. A very humid onshore flow fed a deep inland trough, and combined with a jetstream and a cooling and destabilising upper atmosphere, leading to perhaps the most widespread and intense thunderstorms of the storm season. The talking point of the day was the giant hail that hit inland parts of northern NSW and southern QLD. Narrabri copped hail larger than cricket ball size, severely damaging cars and homes, injuring livestock and damaging crops a mere week before they were due to be picked. Chinchilla was also smashed by giant hail, with reports of hail as large as 12cm, some of the largest ever recorded in Australia. While the large hail didn't reach the coast, slow-moving and moisture packed thunderstorms generated extremely heavy rainfall. Brisbane city was dealt a post-lunch deluge, copping 26mm in just 10 minutes, leading to flash flooding in the CBD. On NSW's Mid North Coast, thunderstorms brought 177mm to Redoak and 172mm to Lake Cathie in the 24 hours to 9am, much of which fell in a short amount of time. The trough will continue to linger over a similar region today, producing further widespread thunderstorms. Along the northern NSW and southern QLD coasts, very heavy rainfall leading to flash flooding is again the greatest risk. About the inland, large hail will again be a feature, most likely about QLD's southern inland. All areas have the risk of wind gusts above 90km/h. Thunderstorms will continue to be prominent over northern NSW and QLD throughout the next week as the trough continues to linger.