Southern England will be battered by intense thunderstorms and torrential rain which could cause 'significant' flooding and a danger to life, forecasters warned today. A seven-hour amber thunderstorm warning has been issued for tomorrow from 4am to 11am amid fears up to 4in (100mm) of rain could fall in a few hours - equivalent to more a month's worth of rain. The alert from the Met Office covers millions of people across major towns and cities including London, Brighton, Portsmouth, Chelmsford, St Albans and Cambridge. It is the first time an amber warning has been issued over London in 18 months since Storm Henk struck England and Wales with very strong winds in January 2024. #weather #ukweather #thunderstorm #weatherwarning #news #rain #flooding #london