Dozens of homes have been flooded and villages left under water after parts of England were again deluged by rain.
The Environment Agency has issued 79 flood warnings for the South, Midlands, East and Yorkshire, meaning immediate action is needed.
A mother and her three sons had to be saved after their car got stuck in flood water in Buckinghamshire.
And rivers including the Medway in Kent, Cuckmere in East Sussex and Loddon in Berkshire burst their banks.
The mother and her family were rescued in Edgcott, near Aylesbury, on Saturday night.
Meanwhile, homes and gardens were damaged when a tornado hit Surrey, earlier on Saturday.
Travellers embarking on the Christmas getaway have been advised to check their routes in advance and drivers have been warned not to move or ignore "road closed" signs.
The Medway has flooded towns and villages including Maidstone, Yalding and Teston. Alfriston, in East Sussex, has been flooded.
Cars in the village were swept away and the Environment Agency warns there is more rain forecast for Tuesday.
Police in Bedfordshire said they had received calls from people out walking who had become stuck in rural areas because of the flooding.
They urged people to be aware of weather conditions in secluded locations, with Bedford Borough Council saying several bridges had been closed in its district because they are "no longer safe to use".
Supermarket workers at Sainsbury's in Tonbridge continued to push trolleys despite rising levels of rain water.
Residents of Little Venice Caravan Park in Yalding, Kent, had to be rescued by motorboat.
On Friday night, one officer had to strip down to his boxer shorts to check on a car stuck in Kingsey.
The tornado struck a number of houses in the Chertsey area on Saturday, according to firefighters.
Resident Verity Boultwood said it blew the roof off her conservatory.
Philip Passey said he "froze" when he saw the tornado, which he thought lasted about 40 seconds.
"A trampoline lifted up in the air, like it weighed nothing, and was thrown across the garden," he said.
"My daughter came downstairs and said the shed roof had gone."
The tornado struck after roads were flooded and rail lines blocked on Friday.
The M23 was closed between junctions 10 and 11 in both directions in West Sussex, but was later reopened.
A tractor was used to carry guests to and from the Hilton Doubletree hotel at Sindlesham near Reading, where the car park has been inundated by overflow from the River Loddon.
Highways England has urged motorists to adapt their driving for wet weather by slowing down, keeping well back from the vehicle in front and easing off the accelerator if steering becomes unresponsive.
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