Met Office issues 10-hour thunderstorm warning with flash flooding possible

The Met Office has issued a 10-hour thunderstorm warning for North Wales
The Met Office has issued a 10-hour thunderstorm warning for North Wales -Credit:Met Office

The Met Office has issued a 10-hour thunderstorm warning for North Wales. It starts at 12pm on Sunday and lasts until 10pm, covering Wrexham, Flintshire, Denbighshire, Conwy, Gwynedd and Anglesey.

People have been warned there could be flash flooding in areas from downpours, with up to 50mm rain possible over a two to three hour period. A Met Office forecast for Wales said: "Heavy showers and thunderstorms are likely to break out in the south of this area late Sunday morning and early Sunday afternoon, moving steadily north whilst growing into larger areas of rain before clearing the area.

"Some intense downpours are possible in a few places, giving up to 30mm in less than hour and perhaps 40-50mm over 2 to 3 hours leading to surface water flooding. Hail, frequent lightning strikes and strong wind gusts will be additional localised hazards."

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Forecasters warned:

  • There is a small chance of fast flowing or deep floodwater causing danger to life, particularly in places such as road and railway underpasses

  • There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds

  • Spray and sudden flooding could lead to difficult driving conditions and some road closures

  • There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost

  • Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services.

People were also advised to ensure moveable objects or temporary structures are well secured, such as bins or garden furniture, in case of gusts; check road conditions before travelling; have torches and batteries, a mobile phone power pack and other essential items, in case of power cuts.

If outside, protect yourself by finding a safe enclosed shelter, such as a car. Do not shelter under or near trees, or other structures which may be struck by lightning - and if you are on an elevated area move to lower ground.

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