Storm Dennis is set to hit Britain with torrential rain and gales – and extraordinary maps show the whole of the UK will be affected.
Weather Outlook maps show that by midday on Saturday there will be torrential rain in Wales, Scotland and northern England.
Only the south-east of England will be dry, but that rapidly changes by 6pm when even that area is engulfed by rain and snow hits Scotland.
On 6am on Sunday, heavy rain will be in Wales and the Midlands, with snow in Scotland, before both the torrential rain and snow moves south-eastwards by midday.
The forecast of heavy rain, strong winds and snow could leave hundreds of homes across the UK flooded this weekend this weekend, experts have warned.
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Storm Dennis is forecast to batter large swathes of the country with 70mph winds and up to 140mm of rain in some areas.
The Environment Agency (EA) said the flood impact from the weather system is likely to be worse than last weekend's Storm Ciara due to rain falling on already saturated ground.
The Met Office has issued severe weather warnings covering most of the UK this weekend.
These include amber warnings stating that flooding could cause a danger to life, power cuts are expected and there is a good chance transport links will be impacted.
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Weather Outlook forecasters said: “Storm Dennis brings very wet and windy weather to much of the country.
“Winds widely gust up to 60mph and in exposed locations 70mph is possible.
“During the second half of the day winds may ease in Scotland. Travel disruption and flooding is expected. It will be mild.
“During Sunday colder and showery conditions return to the north. In the south outbreaks of rain continue but by the evening they probably become confined to the south eastern corner.”
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Storm Ciara, which hit the UK last weekend, left 800 properties flooded in England alone, according to the EA.
There are currently 14 flood warnings, meaning flooding is "expected”, and 135 flood alerts, meaning flooding is possible, in place across the country.
Flood defences will be in operation, and additional temporary flood barriers were installed in Shropshire and Lancashire on Friday ahead of the anticipated deluge.
Barriers to be deployed on Saturday include at Ilkley in Yorkshire and Leatherhead in Surrey.
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More than 500 staff are on active incident duty and 30 mobile pumps have been deployed, the Environment Agency said.
Over this winter period, the agency has issued more than 1,400 flood warnings, while flood defences have protected around 64,000 properties.
Network Rail advised passengers to expect disruption on many routes due to flooding and to allow more time for their journeys.
Tracks could be flooded as the ground near parts of the railway is already saturated, particularly in the north-west.
Cross-border journeys between England and Scotland were severely restricted last weekend.
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Network Rail's network services director Nick King said: "As we saw last week, stormy weather brings high winds that can lead to trees and other debris falling on to the railway, and floods that prevent us from running trains on parts of the network.
"That is why we are again asking passengers to check their journeys before they travel this weekend, either with their train operator directly or through National Rail Enquiries.
"Our teams of engineers will again be out working at all hours and in all weathers to remove fallen trees and debris from the railway, repair damaged infrastructure and work to reopen lines affected by flooding."
Households living near rail lines are being urged to secure any loose items in their gardens, after several trampolines were blown on to tracks and overhead electric wires last weekend, blocking lines.
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The storm is also likely to cause treacherous driving conditions.
RAC patrol of the year Ben Aldous said: "After so much wind and rain last weekend, drivers will again have to contend with some pretty dreadful conditions on the road with the arrival of Storm Dennis.
"With transport disruption likely, drivers should expect their journeys to take longer than usual and should stay up to date with the latest traffic and travel information, as the conditions could change quickly.
"It's essential motorists never attempt to drive through deep floodwater. Those that do are not just risking damage to their vehicles but risking their lives and those of their passengers."
- Met Office
- Weather Forecast
- UK Weather
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