The MET Office has warned of a potential "threat to life" as a month's worth of rain in 24 hours could bring dangerous floods to the UK.
Residents could face more flooding as heavy rainfall is set to bring fast flowing or deep flood water to mid and northwestern areas of Wales tomorrow.
Up to 90mm of rainfall is expected to hit Wales tonight until 10am on Tuesday, with a risk of power cuts and travel disruption.
The average rainfall for March is 117mm in Wales which means the worst affected areas could be hit by three weeks of rain in just over 24 hours.
The Met Office warned there is a good chance some communities will be cut off by flooded roads and fast flowing or deep floodwater could cause a danger to life.
Claire Nasir, Met Office meteorologist, said: "We are expecting some high rainfall totals, particularly over the Welsh mountains – the Peak District as well as the moors of Devon and Cornwall.
"Pretty much the higher ground capturing that wet weather and that will run into the river system, so yet again the River Severn will be vulnerable to higher levels over the next few days.
"Over Tuesday you can see the winds will be strong and then this wavering front continues to feed in cloud and rain to more southern areas for the latter part of Tuesday into Wednesday."
The Environment Agency has issued 180 flood warnings and alerts across the country.
Areas already hit by flooding in February, including Builth Wells and Newtown in mid Wales, are among those expected to be worst hit, with flooding likely to cause damage to homes and businesses.
Last month, the Prince of Wales visited communities already facing massive repair and clean-up operations in the Rhondda Cynon Taf area.
The Met Office has warned a mixed bag of weather is to be expected this week, with conditions as varied as sunshine, heavy rain, powerful winds and snow predicted across the country.
Good news for flood-hit areas could be on the horizon with the long-term forecast predicting drier weather.
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The North East will experience a more slippery start, with some ice expected on the grounds, however no weather warnings are in place.
Conditions will then take a turn, as strengthening rain will build across the country and see conditions deteriorate in the afternoon.
Flood warnings remain across the country, which has already been battered by Storm Ciara, Dennis and Jorge.
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