LONDON — Storm Dennis hammered Britain on Sunday, bringing a month’s worth of rain in just 48 hours to parts of South Wales, which bore the brunt of the country’s second severe storm inside a week.

Rivers across Britain burst their banks and a number of severe flood warnings remained in place as authorities strove to get people to safety and to protect homes and businesses. The Met Office, Britain’s meteorological service, said the disruption is set to carry through into Monday.

Major incidents have been declared in a number of areas in England and Wales as authorities mobilized resources to deal with the impact of the overflowing rivers that have cut off some communities.

Police recovered the body of a man in this 60s from the River Tawe in South Wales.

On Saturday, the storm was blamed for the deaths of two men who were pulled from the sea in separate searches off England’s southeastern coast.

Dennis has been so intense that England posted a record number of flood warnings and alerts and a rare “red warning” for extremely life-threatening flooding was announced for South Wales.

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The Met Office only issues its highest red warning when it thinks the weather will be so dangerous there’s a “risk to life” and that people must take immediate action to protect themselves. It was the first time a red warning has been sounded since December 2015.

Though the warning only lasted a few hours, South Wales police declared a major incident as firefighters and rescue crews continued to help communities following multiple floods, landslides and evacuations.

The Met Office said the highest wind gust recorded was 91 mph at Aberdaron in north Wales on Saturday. It also said a total of 6.1 inches of rain fell at Crai Reservoir in the Welsh county of Powys over two days. One of the worst-hit areas in South Wales was the village of Nantgarw, Rhondda Cynon Taff, near Cardiff, which saw entire streets left underwater since the early hours of Sunday morning.

As the wet and windy weather headed north and eastwards, flood warnings across the U.K. declined but there were still around 360 in place Sunday, from the north of Scotland to southwest England.

John Curtin, the executive director of flood and coastal risk management at the Environment Agency, said in a tweet that at one point during the day, England had the most flood warnings and lower-level alerts in force – than on any other day on record.

Flood warnings could remain in place for a while since much of Britain is still saturated from last week’s Storm Ciara, which left eight people dead across Europe.

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Army personnel were dispatched to assist people in northern England that were badly hit by flooding during last weekend’s Storm Ciara.

The British Red Cross said that with water levels expected to peak on Monday or Tuesday it was ready to respond.

“British Red Cross have been liaising with relevant local authorities, offering to support people affected by Storm Dennis across the U.K.” its crisis response officer Georgie Timmins said.

Hundreds of flights were canceled due to the high winds while train services were disrupted by flooding.

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