The areas and major roads most at risk of flooding as Storm Dennis is poised to strike Wales

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Widespread flooding is predicted across Wales this weekend as Storm Dennis brings heavy and persistent rain to the UK.

The Met Office has issued yellow and amber weather warnings for rain for much of the country from midday on Saturday, February 15 until 3pm on Sunday, February 16.

Warnings for winds of up to 70mph are also in place for much of the weekend.

The storm system is expected to develop in the North Atlantic and then drift eastward towards Wales and the rest of the UK.

Sixteen areas of Wales are predicted to be at a medium risk of flooding – which means floods are expected and preparations need to be made.

A high risk of flooding means there is a significant risk to life in an area. No high level warnings are in place at the moment. 

Natural Resouces Wales has said that “river and surface water flooding is probable for parts of Wales” on Saturday and Sunday and that people need to be prepared.

The areas with flood warnings forecast for Storm Dennis on Saturday and Sunday

Maps key:

Green – very low risk

Yellow – low risk

Orange – medium risk



sixteen areas of Wales have a medium flood warning for Saturday and Sunday

Medium risk  

  • Blaenau Gwent
  • Bridgend
  • Caerphilly
  • Carmarthenshire
  • Ceredigion
  • Conwy
  • Denbighshire
  • Gwynedd
  • Merthyr Tydfil
  • Monmouthshire
  • Neath Port Talbot
  • Newport
  • Powys
  • Rhondda Cynon Taff
  • Torfaen
  • Wrexham

Low risk

  • Cardiff
  • Flintshire
  • Isle of Anglesey
  • Pembrokeshire
  • Swansea
  • Vale of Glamorgan

The worst is expected to have passed by Monday when only five areas of Wales – Denbighshire, Flintshire, Monmouthshire, Powys and Wrexham are forecast to have a low risk of flooding.



The map for Monday shows that the worst will be over

What do I need to do if I live in an area with a flood warning? 

The country was battered by high winds and rain last weekend when Storm Ciara brought flooding, transport disruption and power cuts in its wake.

Many areas of Wales saw floods but one town in north Wales, Llanrwst, had particular problems with the high street and many areas of the town being turned into a torrent.

Although forecasters are predicting that Storm Dennis won’t be as severe as Storm Ciara they say “disruption is likely” when it sweeps in with 70mph winds and nearly five inches (120mm) of rain.

The rain will be heaviest in upland areas of Wales but lower areas will also see between 20-80mm of rainfall.

Road, air, rail and ferry transport is likely to face problems and power cuts are likely as well.

Which roads will be worst affected?

The Met Office warns that driving conditions are likely to be treacherous, particularly in the areas with the heaviest rainfall.

The amber weather warning covers major roads including almost the whole length of the A470 from North Wales and through Merthyr Tydfil to Cardiff.



The amber warning covers major roads in north Wales



and stretches almost to the M4 in South Wales

The M4 in South Wales is in a yellow weather warning area but other major trunk roads such as the A465 are expected to have dangerous conditions due to rain, as well as the A494 and A5 in north Wales.



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