Overnight into Friday, the suburb of Couchy Creek near Numinbah recorded 222mm in the three hours to 12.40am, while Chillingham in the Tweed Valley was hit by 171mm in the three hours to 12.48am.
On Thursday, the Bureau of Meteorology’s Jane Golding said grounds in the region would only become more saturated in the coming days.
“Some locations have seen almost a couple of hundred millimetres fall within the last 24 to 36 hours, and we are expecting more rain and thunderstorms,” she said.
“We’re expecting areas to see 24-hour totals a bit above 100 millimetres, but there will be some bulls-eyes in there, with some higher totals than that.”
The extreme weather resulted in the dramatic rescue of three people from floodwaters in Bingleburra near Dungog on Thursday.
Using a rope as a safety line, senior police constable Richard Hansen entered the floodwater to reach a car that was submerged.
Re-entering the water three times, the constable managed to bring a four-year-old boy and two women, aged 51 and 47, to safety. They were uninjured, but treated for shock.
Speaking at a press conference on Friday morning, Hansen said the “real drama” came after the evening news played the rescue vision, and his wife saw the lengths he went to save the trio.
“She understands, it’s the nature of the beast,” he said.
Hansen said he positioned a camera on the car to record the rescue so that his loved ones could see what he was trying to achieve if things went south.
Detective Superintendent Wayne Humphrey said Hansen had shown “incredible bravery”.
If Richie didn’t do what Richie did, this press conference would be an entirely different press conference,” he said. “He’s humble, he’s a fantastic country cop, and he saved those three peoples’ lives.”
Further north of the Northern Rivers, the Gold Coast also experienced flash flooding overnight into Friday. In the hinterlands, Upper Springbrook recorded 309 mm overnight, while Clagiraba was drenched with 292 mm.
The heavy rain also forced a campground in Helensvale, located near the Gold Coast’s popular theme parks, to be evacuated during the middle of the night.
Earlier this month, the bureau declared a third La Nina event was underway in the Pacific Ocean.
The weather event is set to increase the chance of above-average rainfall in eastern and northern Australia across spring and the upcoming summer season.
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