More than a dozen flood warnings are in place with vast parts of England and Wales facing heavy rain on Saturday.
Up to 120 millimetres could fall in parts of Wales, with the Met Office saying fast flowing flood water was "likely" and could cause a "danger to life".
As rain poured early on Saturday, there were four Met Office weather warnings in place for rain, covering parts of Wales as well as northern and south-western parts of England.
The Government's Flood Information Service has 13 flood warnings where "immediate action is required" across Yorkshire, the Midlands and into Wales.
Early on Saturday morning, Devon and Somerset Fire and Rescue Service said crews had been sent to people who had driven into flood water.
The service tweeted: "Large volumes of flood water in North Devon are making driving conditions hazardous. Fire & Police have attended a number of people who have driven into floodwater. Drivers are asked to respect road closures, not diverting to minor roads which are more treacherous. Avoid travel."
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Humberside Police said a number of roads were impassable due to flooding and urged drivers to avoid the area around the B1246 at Warter.
Meanwhile, a burst of "polar maritime air" is also expected to bring colder temperatures to northern parts of the nation on Saturday, before hitting the rest of the country on Sunday and into next week.
This is expected to bring colder weather, with the first widespread frost of the season anticipated over the weekend, as well as a dusting of snow on higher ground.
Additional reporting by PA.
