The Met Office has extended a severe amber weather warning for large parts of Wales, forecasting that nearly a month's worth of rain could fall within just 24 hours, posing a potential danger to life.
Widespread Disruption and Flooding Risk
The critical amber warning is active from midnight to 11:59pm on Monday, covering the majority of South Wales. It explicitly warns that fast flowing or deep floodwater is possible, which could cause a serious risk to the public. Simultaneously, yellow rain warnings have been issued for parts of England and Wales from the early hours of Monday until 3am on Tuesday, and for most of Monday in south-west Scotland.
Forecasters predict that the highest ground within the amber zone could see a deluge of up to 120mm of rain. More widely, 20mm to 40mm is expected, with hilly areas likely to receive up to 80mm.
Saturated Ground and Landslide Threat
The impact of this heavy rainfall is expected to be significantly worsened because the ground is already saturated from weeks of above-average rain. The Met Office stated that Monday could be a significant event for many.
Adding to the danger, a spokesperson for the British Geological Survey confirmed that rainfall amounts similar to those forecast have previously triggered landslides in Wales. They warned that both natural slopes and man-made infrastructure could be affected.
Senior Met Office meteorologist Marco Petagna provided context, noting that Wales has already seen around 240mm of rain this month, drastically exceeding its November average of 162mm. Combined, England and Wales have experienced 143% of their normal rainfall for the period.
Official Warnings and Public Advice
The amber warning highlights the likelihood of widespread disruption and probable flooding. The public should be prepared for the possibility of homes and businesses being flooded, transport cancellations, power cuts, and some communities being cut off by flooded roads.
In response, Natural Resources Wales (NRW) has issued 34 flood alerts for southern regions. Richard Preece, NRW's duty tactical manager, urged vigilance: We're asking people to be alert for potential flooding... 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.
The Environment Agency has also posted numerous alerts and warnings across England, indicating that flooding is possible or expected in many areas.
