Forecasters have warned that a month's rain could fall in parts of the UK by tomorrow, with three inches expected in Cumbria.
Met Office forecaster Charlie Powell told the Daily Mail: "There will be an awful lot of rain but the places that will see the most will be on the tops of hills in Cumbria and in largely unpopulated areas.
"The average rainfall for Cumbria in February is usually around 100 to 105mm and we forecasting that by tomorrow morning 80mm may have fallen in these areas.
"However in most places it's likely to be more like 20 to 30mm. In the south there will be not an awful lot of rainfall, it will be mostly dry and mild."
The Environment Agency has issued a flood warning for Keswick Campsite, near Derwent Water.
A spokesman told the News & Star: "We have no reports of flooding but we have issued alerts for all 14 river areas in Cumbria.
"At this stage, we are not expecting any flooding of properties or land, but the alerts meant people should be prepared and they should be alert and be aware of what's happening."
The Met Office said on its website that over the South West on Sunday it will "remain cloudy with patchy rain continuing in many areas. More persistent and heavy rain is expected in the west of the region by morning. It will stay rather windy with gales likely."
The BBC reports that a yellow warning to 'be aware' remains in place for parts of North Wales until Monday morning.
Winds are also expected to reach 70mph in a number of places.