'Muggy and unstable' conditions to bring rain, storms and potentially hail to south-east Australia
A car park in Ballina has been flooded as a king tide in northern NSW peaks once again.
The lot on Tamar Street is covered in water which has stranded cars and crept up to the entrance of a medical centre and a gym.
The unpredictable weather could also bring severe storms and hail to much of south-east Australia today, while the north sweats through a heatwave.
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This car park in Ballina in northern NSW has been flooded by a king tide as unpredictable weather continues along the east coast. 9News
The Bureau of Meteorology (BoM) said New South Wales, Victoria, Australian Capital Territory and Tasmania are in the firing line for rain and storms.
"Showers and storms likely in Vic and NSW, which may be severe," it said.
"Heavy rain leading to flooding and damaging wind gusts are the main risks and hail is possible. Tasmania to see rain and storms from Thursday."
The Australian Capital Territory State Emergency Service is urging residents to prepare now.
Responders continue to clean-up after a furious storm swept through the territory on Monday afternoon.
"It's been a wild couple of days with the ACTSES receiving nearly 800 calls for help since Monday afternoon's storm," it wrote.
"More unsettled weather is predicted at the end of the week. Prepare your home and family by completing or updating your Survival Plan."
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The clean-up continues after a powerful storm ripped through the ACT on Monday afternoon. ACT ESA
Days of wild weather have also been felt across south-east Queensland and northern NSW as ex-cyclone Seth lugged its way towards the coast.
The tropical low collided with a king tide generating powerful swell, high tides and damaging winds.
Narrowneck beach on the Gold Coast was almost completely swallowed by the high tides. Luke Bradnam
A lucky ute owner narrowly avoided losing his vehicle to the tides, after it was swept off a Queensland beach.
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The BoM said the coastline from the NSW Central Coast to Queensland's Sunshine Coast has been hit by "abnormally high tides".
"Places like Byron Bay have seen average waves of five metres," meteorologist Agata Imielska said.
"The highest wave we saw in Byron Bay was 10 metres."
Cyclone-triggered tides were present at a Queensland beach. 9News
Here's what's happening across the nation's capitals.
Brisbane
It will be a rainy and cloudy day in Brisbane with a medium chance of showers forecast. Rain is most likely from late this morning, with the chance of a thunderstorm.
A high of 30C is forecast.
Winds will tend southerly at 15 to 25 km/h, before strengthening and moving southeasterly to 20 to 30 km/h in the morning.
Sydney
Showers are also on the cards for Sydney, with the chance of a thunderstorm during this afternoon and evening.
A low of 21C will be experienced before temperatures climb to 28C.
It's been a soggy start to the morning in Sydney with rain falling across the city. Belinda Grant-Geary
Melbourne
Melbourne should brace for a "possibly severe" thunderstorm today, with the BoM also forecasting a "very high chance" of showers and heavy rain.
Temperatures will reach a maximum of 26C.
Canberra
Canberra has a medium chance of showers, most likely during this afternoon and evening.
There is also a chance of a thunderstorm during this afternoon and evening. Winds will tend easterly at 25 to 35 km/h.
The ACT State Emergency Service have received almost 800 calls for help after the last storm swept through Canberra. ACT ESA
Perth
Perth will again have the distinction of being Australia's hottest capital, with a high of 37C forecast.
It will be a clear sunny day.
Temperatures in Western Australia could reach 49C later this week as a three-day heatwave moves across WA, Northern Territory and far-north Queensland.
Darwin
Residents in Darwin will sweat through a 32C day, which will bring showers and the chance of a thunderstorm.
Gusty winds will blow through the city during this afternoon and evening.
Adelaide
Adelaide is in for a cold start with temperatures hitting 14C before climbing to a high of 23C.
There's a high chance of showers about the hills and southern suburbs, and a medium chance elsewhere.
Winds will tend southerly at 25 to 40 km/h.
Hobart
It will be a cloudy day in Hobart, which will reach a maximum temperature of 19C. There's a high chance of light showers.
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