Deadly flood warnings with month of rain to fall in 24 hours

UNITED KINGDOM, London. 01 December 2025. ???Londoners make their way across Westminster Bridge this morning during the wet and windy weather. Credit: Thomas Krych/Story Picture Agency
Londoners braving the wet and windy weather while making their way across Westminster Bridge on Monday morning (Picture: Thomas Krych/Story Picture Agency)

An amber warning for heavy rain strong enough to cause landslides has been issued for a large swathes of South Wales.

Forecasters predict a whole month’s worth of rain is set to fall across the area in the space of just 24 hours.

The ‘be prepared’ warning is in place until 11.59pm on Monday night and advises there is a risk of ‘fast flowing or deep floodwater’ which ‘could cause a danger to life’.

Some 120mm of rain could fall on high ground, sufficient to trigger landslides, a spokesperson for the British Geological Survey said.

The Met Office warned that the impact will be felt more greatly in what it termed a ‘significant event for many’ as the ground is already saturated from previous rainfall.

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Wales experienced 240mm of rain last month, far more than its average for November of 162mm.

South Wales has been placed on an amber ‘be prepared’ warning for rain lasting until 11.59pm on Monday

Elsewhere, a yellow rain warning is set to come into effect for the rest of Wales as well as south west and north west England and will stay in place for many until Tuesday.

Senior operational Met Office meteorologist Marco Petagna suggested that the agency would not issue further warnings for beyond tomorrow in order to not ‘distract’ from tomorrow’s expected severe weather.

weather flood warning - metro graphics
There are five flood warnings in place across the UK (Picture: Metro)

He said: ‘All areas have seen above normal rainfall, Scotland and Northern Ireland are less of an issue of tomorrow, away from south-west of Scotland.

‘It’s mostly parts of England and Wales – many areas have seen already well-above normal rainfall and another several inches to come.’

He added that the outlook for Tuesday and Wednesday was looking brighter with less heavy showers.

Mandatory Credit: Photo by Amer Ghazzal/Shutterstock (15875260c) Pedestrians with umbrellas crossing Wimbledon Common, south west London on a wet and blusterty. The forecast is for rain this weekend as temperatures are expected to reach lows of -5C in rural southern England. Seasonal Weather, Wimbledon Common, London, United Kingdom - 22 Nov 2025
As much as one month’s worth of rain could fall in parts of Wales within 24 hours (Picture: Shutterstock)

A total of 38 alerts for flooding have been issued by Natural Resources Wales.

Duty tactical manager Richard Preece urged people to stay alert for possible floods, including by avoiding swelling riverbanks or driving through floodwater.

He said: ‘With some rivers already swollen and the ground saturated, we expect to see a number of flood alerts and warnings issued.

‘We’re urging people to be vigilant and to make preparations for potential flooding now.

‘We also want to remind people to keep away from swollen riverbanks and not to drive or walk through flood waters as you don’t know what lies beneath.’

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