Flood-hit communities are warned to brace for strong winds and heavy of rain as the unsettled weather continues to batter large parts of Britain.
The Met Office has issued yellow warning for rain in Wales and yellow warning for snow and ice in Scottish Highlands.
Forecasters said the wave of torrential rain will give way to more showery weather as the day progresses.
But the heavy weather will sweep in again on Sunday night, bringing rain and high winds to many areas and snow to parts of Scotland and northern England on Monday.
While the extreme weather should settle down over Tuesday and Wednesday, the Met Office said further heavy rain is expected later in the week.
The heavy downpour could create further challenges as river catchments are more likely to respond to extra rainfall more quickly.
Bus and train services could be affected as a band of persistent rain to lash the UK where South Wales could see up to 60mm of rainfall.
The number of flood warnings in force in England dropped slightly on Saturday afternoon as the rain relented in many areas - albeit with gale-force winds continuing in the north.
On Saturday night, five flood warnings remained in force across Wales - mainly on the River Severn and River Dee - with 23 flood alerts.
In England, the two severe flood warnings on the River Lugg, in Herefordshire, were downgraded but 74 flood warnings and 170 flood alerts remained in place.
Dan Suri, chief forecaster at the Met Office, said: "A relatively deep area of low-pressure system on Monday provides a continuation of the extremely unsettled period the UK has endured.
"Despite reports to the contrary, this system hasn't been named, and there is no plan to do so currently, despite some speculation on social media.
"With further rain in the forecast over the coming days, additional rainfall could create further challenges as river catchments are more likely to respond to extra rainfall more quickly.
"Flooding, especially in areas already heavily affected, remains a possibility."
Scott Squires, duty tactical manager for Natural Resources Wales, said: "As the floodwaters recede and communities start to get back on their feet, we'll continue to support local authorities and emergency service in these affected areas.
"Over the coming days our teams will be checking for any signs of damage to our flood defences, and removing blockages and debris which has built up in culverts and drainage grids etc."
There was further flooding on Friday night and Saturday morning on the southern edge of the Yorkshire Dales.
The village of Horton-in-Ribblesdale was cut off by rising water and there were road closures and further flooding along the Otley-Ilkley-Skipton corridor, north of Bradford.
North Yorkshire Fire and Rescue Service said they had to rescue four people from a stranded car in Skipton and two horses stuck in floodwater nearby.
