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Thunderstorm warning following hottest day of the year

Whilst many places will be dry or see little rain, thunderstorms may cause flooding and disruption in a few places.

The Met Office has issued a yellow warning for thunderstorms, following the hottest day of the year so far which saw temperatures reach as high as 30′ degrees in Wales.

Thunderstorms may develop across parts of western UK late on Thursday afternoon and into the evening. A larger area of thunderstorms is then expected to move northeastwards overnight into Friday. Many places will miss the worst of the storms but where they do occur torrential downpours could bring 30-40 mm rain in less than two hours. Lightning and hail are also likely to be additional hazards.

What to expect

  • 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
  • Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services
  • Spray and sudden flooding could lead to difficult driving conditions and some road closures
  • There is a small chance that some communities become cut off by flooded roads
  • There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost

Areas affected in Wales

  • Blaenau Gwent
  • Bridgend
  • Caerphilly
  • Cardiff
  • Carmarthenshire
  • Ceredigion
  • Conwy
  • Denbighshire
  • Flintshire
  • Gwynedd
  • Isle of Anglesey
  • Merthyr Tydfil
  • Monmouthshire
  • Neath Port Talbot
  • Newport
  • Pembrokeshire
  • Powys
  • Rhondda Cynon Taf
  • Swansea
  • Torfaen
  • Vale of Glamorgan
  • Wrexham
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