An overnight reprieve from wild, wet weather in northern NSW is not expected to last as heavy rainfall is forecast to return on Monday morning when a low-pressure trough sitting off southern Queensland moves onshore.
There have been fears the resulting deluge would coincide with a king tide set to peak at about 8.30am AEDT, but Bureau of Meteorology forecaster Helen Reid said the trough is still "quite a long way offshore" and will take a few more hours to hit.
Ms Reid said it was "helpful" that it is not "bucketing with rain" at the same time as the king tide – but since those rivers are already in flood there is still a serious erosion risk – and there may be another high tide by the time more heavy rain hits later on Monday.
In Byron Bay, where erosion is already heavily impacting the main beach, a Nine News camera captured a walkway collapsing into rising waters early on Monday, taking a member of the public down with it. Thankfully, the man was able to climb back up to safety.
Ms Reid said Monday's rainfall in the north is unlikely to reach quite the heights of Saturday, which saw flash flooding inundate the coastal town of Ocean Shores, near Byron Bay – but she is still predicting upwards of 100 millimetres.
A severe weather warning is in place for damaging winds, heavy rainfall, abnormally high tides and damaging surf in the Northern Rivers, and parts of the Mid North Coast and Northern Tablelands. In the far north, thunderstorms may concentrate heavy deluges and lead to further flash flooding.
A spokesman for the SES said crews were in "watch and wait" mode after rain eased off overnight Monday.
Beaches at Byron Bay have been sandbagged.Credit:Nine
Calls were down to 56 on Sunday night after about 700 people required assistance throughout the weekend – and there had fortunately been no more flood rescues, after five people had to be pulled from floodwaters on Saturday.
"We were expecting quite a bit to hit us last night," the spokesman said, but the low-pressure system was yet to come in off the coast.
"It may hit later this morning... [we're remaining] pretty vigilant."
SES crews have been evacuating caravans in particularly at-risk areas as a precaution and are door-knocking and assisting with preparation in those communities.
People walk along a beach in Byron Bay.Credit:Nine
Byron's Bay's main beach has been extensively sandbagged by council workers due to coastal erosion but no properties were under threat on Sunday.
The fringes of the system were affecting Sydney and the Hunter on Monday, where a few showers are expected throughout Monday and more rain on Tuesday.
In Sydney, Tuesday looks like the biggest rainfall day with 20-30 millimetres forecast, Ms Reid said.
"By comparison, it will be easing in the Northern Rivers and Mid North Coast [on Tuesday], but they can still expect about 100 millimetres," she said.
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Jenny Noyes is a journalist at the Sydney Morning Herald.
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2020-12-13 21:22:00Z
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