London

Information on update: The warning has been extended north and east to cover more of southern England. Areas of heavy showers and thunderstorms will move northwards across southern parts of England and Wales later Monday, clearing northwards overnight. Some places will see 20-30 mm of rain within 2-3 hours, with a small chance that a few places could receive 40 mm. Thunderstorms are most likely for south-facing coastal districts, and hail and some strong gusts of wind could accompany the heaviest showers and thunderstorms. What should I do? Consider if your location is at risk of flash flooding. If so, consider preparing a flood plan and an emergency flood kit. Give yourself the best chance of avoiding delays by checking road conditions if driving, or bus and train timetables, amending your travel plans if necessary. People cope better with power cuts when they have prepared for them in advance. It’s easy to do; consider gathering torches and batteries, a mobile phone power pack and other essential items. If you find yourself outside and hear thunder, protect yourself by finding a safe enclosed shelter (such as a car). Do not shelter under or near trees, or other structures which may be struck by lightning. If you are on an elevated area move to lower ground. Be prepared for weather warnings to change: the Met Office recommends staying up to date with the weather forecast in your area. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings What to expect: There is a good chance driving conditions will be affected by spray, standing water and/or hail, leading to longer journey times by car and bus; Delays to train services are possible; Some short term loss of power and other services is possible; Some flooding of a few homes and businesses is possible; Perhaps damage to a few buildings and structures from lightning strikes, hail or gusty winds, this most likely close to coasts.