Ex-tropical cyclone Oswald has brought widespread flooding and strong winds to eastern Australia.
The Environment Agency has issued flood warnings and flood alerts across the UK.
Milder temperatures overnight will cause snow to thaw rapidly, with heavy rain expected to bring the risk of flooding in England and Wales.
Torrential rain has flooded several towns in eastern Australia, killing three people, reports Associated Press.
Businesses in the Queensland state capital Brisbane were inundated while 1,200 properties were flooded by record-high waters in the city of Bundaberg, 240 miles to the north.
Helicopters were used to rescue 18 people from the roofs of their homes in Bundaberg, which has a population of 98,000.
Queensland police said that three people were confirmed dead in the floods.
There was also flooding in the Queensland towns of Gladstone, Gympie and Ipswich
Severe weather warnings have been put in place across parts of the UK by the Met Office.
More flooding is expected to continue over the next two days, affected areas are:
- Central, Tayside & Fife, Grampian, Highlands & Eilean Siar, Orkney & Shetland, SW Scotland, Lothian Borders, South West England, South West England, Strathclyde, Wales, West Midlands
To find out what to do when it floods, visit the Environment Agency website.
The Environment Agency has issued 80 flood warnings across the UK, with no severe flood warnings in place.
Water levels remain high, with more rain expected over the next two days.
Tuesday could see the worst of the floods, as rain falls on already saturated ground.
Many parts of Britain are on flood alert tonight after rain and rising temperatures triggered a sudden thaw. There are 79 flood warnings, and 289 flood alerts across the country - with the forecast of yet more heavy rain tomorrow.
ITV News reporter Lewis Vaughan Jones reports:
Wherever you are tomorrow, take your umbrella with you - even if you wake up in sunshine - you won't regret it.
RAF and Mountain rescuers are seen above the scene of an incident in Reeth, in the Yorkshire Dales, today, where a canoeist got into difficulties in the swollen River Swale.
The man, in his 30s, was transported to hospital but later died.
A canoeist who was pulled from a swollen river in Reeth, North Yorkshire today has died, the Great North Air Ambulance Service said.
A spokesman confirmed the man, who was in his 30s, died "despite efforts to save him."
"This was a large-scale rescue effort involving police, fire, RAF and Swaledale Mountain Rescue Team.
"Sadly, despite everyone's best efforts, the man was later pronounced dead. Our thoughts are with his family and friends."
A male canoeist has been rescued from the River Swale at Reeth, in the Yorkshire Dales, after a major operation involving an RAF Sea King helicopter, mountain rescuers and local police and fire services.
– North Yorkshire Fire Service spokesman
Together with the Swaledale Mountain Rescue Team, fire service level three trained water teams deployed and rescued a male canoeist from the water.
The male casualty has been transported to hospital by air ambulance. There is no further current information as to the casualty's condition.
There is a risk of further flooding as heavy downpours are predicted to return tomorrow. Surface water and river levels are expected to rise, as gusts of up to 60mph are expected to hit the west coast, before "severe" stormy weather is forecast for western areas and Scotland by Wednesday.
– Paul Knightley, MeteoGroup forecaster
Most areas have seen between 5-10mm of rain but parts of the south west, Wales and Cumbria have seen 20-30mm in just a couple of hours. This is likely to cause flooding issues because the rain has fallen on already saturated ground.