UK weather: Amber warning as thunderstorms to bring flash flooding
Why drought can lead to dangerous flooding
The amber warning covers a stretch of the south coast, London and Cambridge, and is in force from 04:00 BST to 11:00 on Saturday.Between 20 and 40mm of rain could fall within an hour in this area, the Met Office has warned, which could accumulate to 70-100mm in just a few hours. It said homes and businesses are likely to be flooded, which will happen "quickly", while this amount of surface water will make driving difficult and may lead to road closures.Lightning strikes, hail and strong winds may also cause train and bus cancellations.Yellow weather warnings will cover the rest of eastern, central and northern England and a portion of eastern Scotland. A yellow warning is already in force for parts of eastern England.Amber warnings indicated there is an increased chance severe weather could affect people's day-to-day lives, including a potential danger to life. Yellow warnings are less severe.The last amber warning over London was in January 2024, when Storm Henk hit parts of central England and Wales, according to the Met Office.After arriving on Friday night, the storm is forecast to move inland, pushing northwards across England on Saturday morning before arriving in Scotland by midday.Yellow warnings for rain cover parts of England and Scotland on Sunday and Monday as residual parts of the storm linger.Last weeks heatwave brought travel disruption, a number of water-related deaths and hosepipe bans being declared for millions living in Yorkshire, Kent and Sussex.One might think a heavy dose of rainfall would help reduce these drought conditions - but because the rain will be very heavy in localised areas, it will run off the dry, baked earth rapidly, perhaps overwhelming local sewers and waterways.A substantial recovery in reservoir and groundwater aquifer levels would require a more sustained spell of wet weather.Yorkshire's hosepipe ban is expected to last until winter.Thunderstorms following a heatwave in the summer of 2022 brought flash flooding to London and the surrounding areas, flooding roads and Tube stations. The rainfall also caused cancellations and delays at Gatwick Airport.
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