Amber warning of thunderstorm affecting London & South East England

 
⚠

Amber warning for London & South East England

Thunderstorm
Between 15:21 (UTC+1) on Mon 12 Jun 2023 and 19:00 (UTC+1) on Mon 12 Jun 2023

Headline

Active thunderstorms will bring heavy rainfall, lightning, strong winds, and hail. Travel disruption and surface water flooding are likely.

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
  • Where flooding or lightning strikes occur, delays and some cancellations to train and bus services are likely
  • Spray and sudden flooding probably leading to difficult driving conditions and some road closures
  • Some communities likely to become temporarily cut off if roads flood
  • Power cuts likely to occur and other services to some homes and businesses could be lost

What should I do?


Issued: 15:21 (UTC+1) on Mon 12 Jun 2023

Further details

A cluster or line of very active thunderstorms is moving towards the northwest from from Bedfordshire and Buckinghamshire towards the West Midlands. These will bring a period of exceptionally heavy rainfall with 30-40mm falling in around 30 minutes, perhaps around 60mm in an hour for some locations. Frequent lightning strikes, winds that may gust to 45 mph, and some large hail stones perhaps up to 4cm in diameter will also accompany the storms. Surface water flooding may happen very quickly, likely disrupting travel and flooding some properties (especially in urban areas). Lightning, strong winds and hail will all pose a significant danger to those outdoors. The ultimate northwestern extent of this area remains somewhat uncertain.

View full warning details and map view


Regions and local authorities affected

East Midlands

  • Derbyshire
  • Leicester
  • Leicestershire
  • Northamptonshire

East of England

  • Bedford
  • Central Bedfordshire
  • Hertfordshire

London & South East England

  • Buckinghamshire
  • Milton Keynes
  • Oxfordshire

South West England

  • Gloucestershire

West Midlands

  • Herefordshire
  • Shropshire
  • Staffordshire
  • Warwickshire
  • West Midlands Conurbation
  • Worcestershire