Storm Dennis shut down roads and flooded railway lines on Sunday as it lashed large parts of Britain with heavy rainfall and strong winds.

The Met Office issued a red warning for rain -- the highest level of its kind -- for parts of south Wales on Sunday morning.

Red warnings are issued when it is highly likely the weather will cause a high level of impact, and this warning is the first red warning for rain the Met Office has issued since December 2015.

"Whilst the heaviest rain has cleared from Northern Ireland and Scotland, England and Wales will continue to see heavy rain on Sunday, with a risk of severe flooding in places. In particular, heavy rain has led to severe flooding across parts of south Wales triggering a red rain warning, where around 140 mm of rain in total could fall, before it gradually eases this afternoon," said Met Office Chief Meteorologist Andy Page.

Meanwhile, the storm has caused disruption at Edinburgh, Glasgow, Newcastle, Southend, Stansted, Heathrow and Gatwick airports over the weekend, as about 170 flights were cancelled as of Sunday morning, affecting at least 25,000 passengers.

Rail services have also been suspended in south Wales and parts of England and Scotland, according to the National Rail.

There are 594 alerts currently in place, including four severe warnings in England and widespread amber alerts from the Met Office. There are also two severe flooding alerts in Wales.

Across 24 hours in South Wales, 105 mm of rainfall and gales of up to 146 kph were recorded in the area.

British experts said that Storm Dennis can bring more damage to the country than Storm Ciara, which brought as much as 184 mm of rainfall and gusts reaching 156 kph to the country last weekend, resulting in hundreds of homes flooded and more than 500,000 being left without power. 

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