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| UK weather: Amber warning as thunderstorms set to bring flash floods | UK weather: Amber warning as thunderstorms set to bring flash floods |
| (about 8 hours later) | |
| Parts of the UK are bracing for potentially dangerous flash flooding as thunderstorms and torrential rain are set to arrive over the weekend. | |
| An amber weather warning came into effect on Saturday morning, when more than a month's worth of rain is forecast to fall in a matter of hours. | |
| The Met Office says fast-flowing and deep floodwaters are likely, leading to road and transport disruption, as well as power cuts. | |
| The warning for torrential downpours comes days after a third UK heatwave of the year that parched swathes of the UK and led to several hosepipe bans being declared. | |
| Why drought can lead to dangerous flooding | Why drought can lead to dangerous flooding |
| This will make flooding more likely and severe as the dry ground will not be able to absorb as much water. | |
| 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. | 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. | 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. | 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. | Lightning strikes, hail and strong winds may also cause train and bus cancellations. |
| Yellow weather warnings are in place for rest of eastern, central and northern England and will be in place for a portion of eastern Scotland later on Saturday. A yellow warning is already in force for parts of eastern England. | |
| Amber warnings indicate 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. | 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. |
| Thunderstorms develop when warm and humid air exists below much colder air in the atmosphere. This destabilises the air, allowing clouds to form and produce heavy rain - and storms. | Thunderstorms develop when warm and humid air exists below much colder air in the atmosphere. This destabilises the air, allowing clouds to form and produce heavy rain - and storms. |
| The thunderstorms will develop initially over northern France but they will be allowed to "grow" as they move north over the eastern half of the UK on Saturday. | The thunderstorms will develop initially over northern France but they will be allowed to "grow" as they move north over the eastern half of the UK on Saturday. |
| 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. | 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. |
| On Sunday and Monday, Yellow warnings for rain will cover parts of England and Scotland as residual parts of the storm linger. | |
| Last week's heatwave brought travel disruption, a number of water-related deaths and hosepipe bans being declared for millions living in Yorkshire, Kent and Sussex. | Last week's 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. | 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. | 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. | 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. | 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. | The rainfall also caused cancellations and delays at Gatwick Airport. |