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Warning details for UK

Amber warning
Rain
between and

Created:

16:48 on Sun 27 May 2018 BST

Headline

Thunderstorms will continue across parts of the Midlands and into north Wales through the rest of Sunday afternoon and into the evening

What to expect

  • Flooding of homes and businesses is likely and could happen quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds
  • Spray and sudden flooding probably leading to difficult driving conditions and some road closures as well as some delays or cancellations to train and bus services.
  • Power cuts likely to occur and other services to some homes and businesses could be lost
What should I do?

Regions and local authorities affected:

  • East Midlands
  • London & South East England
  • North West England
  • Wales
  • West Midlands
East Midlands
  • Leicestershire
  • Northamptonshire
London & South East England
  • Oxfordshire
North West England
  • Cheshire East
  • Cheshire West and Chester
Wales
  • Conwy
  • Denbighshire
  • Flintshire
  • Gwynedd
  • Isle of Anglesey
  • Powys
  • Wrexham
West Midlands
  • Shropshire
  • Staffordshire
  • Telford and Wrekin
  • Warwickshire
  • West Midlands Conurbation
  • Worcestershire

Further details

Thunderstorms bringing torrential rain, frequent lightning and some hail have developed across the Midlands and north Wales and will continue to affect these areas through the rest of Sunday afternoon. These may run across highly urbanised areas with 30 mm in an hour in some places and perhaps 60-80 mm in 3 hours. The thunderstorms are expected to ease through Sunday evening.

Warning impact matrix

Very
likely
to
Unlikely
Very low
impact
to High
impact

Impact matrix guide

Yellow warning
Rain
between and

Updated:

Reason for update

This warning has been updated to remove Cornwall from the warning area.

Headline

Thunderstorms will continue to affect parts of Wales, southern and central England through Sunday and into Monday morning.

What to expect

  • Flooding of homes and businesses could happen quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds
  • Fast flowing or deep floodwater is possible, causing a danger to life
  • Spray and sudden flooding could lead to difficult driving conditions and some road closures and some communities might become cut off if roads flood
  • Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services
  • Power cuts might occur and other services to some homes and businesses could be lost
What should I do?

Regions and local authorities affected:

  • East Midlands
  • East of England
  • London & South East England
  • North West England
  • South West England
  • Wales
  • West Midlands
  • Yorkshire & Humber
East Midlands
  • Derby
  • Derbyshire
  • Leicester
  • Leicestershire
  • Lincolnshire
  • Northamptonshire
  • Nottingham
  • Nottinghamshire
  • Rutland
East of England
  • Bedford
  • Cambridgeshire
  • Central Bedfordshire
  • Essex
  • Hertfordshire
  • Luton
  • Norfolk
  • Peterborough
  • Southend-on-Sea
  • Suffolk
  • Thurrock
London & South East England
  • Bracknell Forest
  • Brighton and Hove
  • Buckinghamshire
  • East Sussex
  • Greater London
  • Hampshire
  • Isle of Wight
  • Kent
  • Medway
  • Milton Keynes
  • Oxfordshire
  • Portsmouth
  • Reading
  • Slough
  • Southampton
  • Surrey
  • West Berkshire
  • West Sussex
  • Windsor and Maidenhead
  • Wokingham
North West England
  • Blackburn with Darwen
  • Blackpool
  • Cheshire East
  • Cheshire West and Chester
  • Greater Manchester
  • Halton
  • Lancashire
  • Merseyside
  • Warrington
South West England
  • Bath and North East Somerset
  • Bournemouth
  • Bristol
  • Devon
  • Dorset
  • Gloucestershire
  • North Somerset
  • Poole
  • Somerset
  • South Gloucestershire
  • Swindon
  • Wiltshire
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
West Midlands
  • Herefordshire
  • Shropshire
  • Staffordshire
  • Stoke-on-Trent
  • Telford and Wrekin
  • Warwickshire
  • West Midlands Conurbation
  • Worcestershire
Yorkshire & Humber
  • North Lincolnshire
  • South Yorkshire
  • West Yorkshire

Further details

Thunderstorms will continue to develop over the southern half of the UK throughout Sunday with some of these persisting into Monday morning. Whilst many areas will see small amounts of rain a few locations may see some very large totals with 30 mm possible within an hour and perhaps up to 80 mm in 3 hours. Along with this hail and thunder are likely as well as some locally strong gusts. The most likely location for seeing these severe thunderstorms is over parts of east and north Wales and extending southeastwards into the West Midlands .

Warning impact matrix

Very
likely
to
Unlikely
Very low
impact
to High
impact

Impact matrix guide

Yellow warning
Rain
between and

Created:

10:34 on Sun 27 May 2018 BST

Headline

Thunderstorms may form across parts of Wales and southern England on Monday afternoon.

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
  • Spray and sudden flooding could lead to difficult driving conditions and some road closures
  • Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services
  • There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost
What should I do?

Regions and local authorities affected:

  • East of England
  • London & South East England
  • South West England
  • Wales
East of England
  • Essex
  • Norfolk
  • Southend-on-Sea
  • Suffolk
  • Thurrock
London & South East England
  • Bracknell Forest
  • Brighton and Hove
  • East Sussex
  • Greater London
  • Hampshire
  • Isle of Wight
  • Kent
  • Medway
  • Portsmouth
  • Reading
  • Southampton
  • Surrey
  • West Berkshire
  • West Sussex
  • Windsor and Maidenhead
  • Wokingham
South West England
  • Bath and North East Somerset
  • Bournemouth
  • Bristol
  • Cornwall
  • Devon
  • Dorset
  • North Somerset
  • Plymouth
  • Poole
  • Somerset
  • South Gloucestershire
  • Torbay
  • Wiltshire
Wales
  • Blaenau Gwent
  • Bridgend
  • Caerphilly
  • Cardiff
  • Carmarthenshire
  • Ceredigion
  • Conwy
  • Gwynedd
  • Isle of Anglesey
  • Merthyr Tydfil
  • Monmouthshire
  • Neath Port Talbot
  • Newport
  • Pembrokeshire
  • Powys
  • Rhondda Cynon Taf
  • Swansea
  • Torfaen
  • Vale of Glamorgan

Further details

Further thunderstorms may form on Monday afternoon. Whilst many areas will miss these and see little or no rain any thunderstorms that do form are likely to be slow moving. These could give 25-35 mm of rain in less than an hour with the potential for 50-60 mm in 2-3 hours were separate storms to affect the same location. Lightning and hail may also be additional hazards.

Warning impact matrix

Very
likely
to
Unlikely
Very low
impact
to High
impact

Impact matrix guide

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