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Wales Online
Wales Online
National
John Cooper

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

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 (Natural Resources Wales)

    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 (Natural Resources Wales)

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

    • Remain vigilant and ensure you access the latest weather forecast 
    • Consider re-scheduling your journey. Don’t drive or walk through flood water 
    • Think about preparing for flooding and take precautions where possible 
    • Review your flood plan and start taking action 
    • Check the Natural Resources Wales flood warning page or call Floodline 0345 988 1188 for the latest flooding information

    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 (Met Office)
    and stretches almost to the M4 in South Wales (Met Office)

    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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