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Weather warnings

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Warning details for UK

Yellow warning
Thunderstorm
between and

Created:

10:34 on Wed 18 Jul 2018 BST

Headline

Most places will be dry but there is the potential for slow-moving thundery downpours in places.

What to expect

  • There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater.
  • Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train, bus and tube services, particularly during the evening rush hour.
  • Spray and sudden flooding could lead to difficult driving conditions with the possibility of road closures
  • 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 Midlands
  • East of England
  • London & South East England
  • South West England
East Midlands
  • Leicestershire
  • Lincolnshire
  • Northamptonshire
  • 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
South West England
  • Bournemouth
  • Dorset
  • Poole
  • Swindon
  • Wiltshire

Further details

High temperatures may set off some heavy showers and thunderstorms, which in some places could be slow-moving and persistent, bringing a risk of flooding. Should they develop, in the heaviest showers some places could see 30mm of rain in an hour, which would likely bring flooding impacts particularly should this fall on an urban area. There would also be a smaller chance of impacts from lightning strikes. As is the nature of showers, many places will miss them altogether, and it is not possible to say precisely where they will occur, but the warning area highlights the region at greatest risk.

Warning impact matrix

Very
likely
to
Unlikely
Very low
impact
to High
impact

Impact matrix guide

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