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UK weather: Yellow warnings as thunderstorms could bring flash floods UK weather: More yellow rain alerts bring threat of flash floods
(about 2 hours later)
Get set for storms: UK weekend weather forecast Some took precautions during Saturday's rain in London
Yellow weather warnings for thunderstorms and heavy rain are in place for much of the UK, bringing potential for flash flooding. An amber weather warning did not produce the intense rain and flash flooding that was feared, but more unsettled weather is on the way for much of the UK.
Most of England falls under the alert which runs until 21:00 BST and may cause disruption to travel, fast-flowing water and power cuts, the Met Office says. All four nations of the UK are blanketed by yellow rain and thunderstorm warnings for the rest of Saturday, with the Met Office saying this could bring flash flooding, power cuts and disruption to travel.
A separate yellow rain warning covers eastern Scotland from the Borders up to Aberdeen, running from 16:00 on Saturday until noon on Sunday. Further yellow alerts for heavy rain and some thunderstorms cover Scotland and south west England on Sunday - with a new yellow thunderstorm alert extended across much of England on Monday.
It follows the agency issuing a more severe amber thunderstorm warning for London and south-east England which ended at 11:00 on Saturday, though the "torrential downpours" forecast were not as bad as feared. But flash flooding forecast for London and south-east England on Saturday morning "thankfully didn't occur", BBC Weather's Simon King said.
The wet weekend comes after a third heatwave of the year that parched swathes of the UK and led to several hosepipe bans being declared.The wet weekend comes after a third heatwave of the year that parched swathes of the UK and led to several hosepipe bans being declared.
The recent warm spell has made flooding more likely and severe as the dry ground is unable to absorb as much water.The recent warm spell has made flooding more likely and severe as the dry ground is unable to absorb as much water.
While the more severe warning is now over, the yellow thunderstorm warning in place for Saturday afternoon covers all of England except for the south west.
Why drought can lead to dangerous floodingWhy drought can lead to dangerous flooding
Thunderstorms are rolling in across large parts of the countryThunderstorms are rolling in across large parts of the country
All of Cornwall and much of Devon fall under a separate yellow warning for rain from midday on Sunday until the early hours of Monday. Earlier, the Met Office warned that London, Cambridge and the south coast could see a month's worth of rainfall - between 20 and 40mm (0.8in to 1.6in) in an hour, but in most areas this was not as bad as feared.
This is alongside the rain warning in eastern and central Scotland, which runs overnight on Saturday. BBC Weather's Simon King said "the really intense downpours didn't occur", with Charlwood in Surrey seeing the most rain with 23mm in an hour on Saturday morning, and 14mm in an hour in Kenley, Croydon.
Wales and Northern Ireland have escaped the alerts. "The worst of the intense rain and frequent thunderstorms expected in south-east England this morning didn't quite develop as forecast," he said.
"Therefore the anticipated flash flooding in the Met Office amber warning thankfully didn't occur.
"However, with yellow warnings still in force quite widely, there is still a chance of more localised and isolated impacts from thunderstorms."
Thunderstorms and rain have interrupted Britain's hot spell
This includes "large downpours bringing the risk of a bit of flash flooding and big puddles that could cause some travel disruption", he added.
The yellow thunderstorm warning in place for Saturday afternoon covers all of England except for the south west.
These additional warnings are in place:
Yellow warning of rain for all of Devon, Cornwall and south Wales, with a risk of localised flooding, thunderstorms and transport disruption, from 18:00 on Saturday until 21:00 on Sunday
Yellow warning of thunderstorms for the western half of Northern Ireland from 12:00 until 18:00 on Saturday
Yellow warning of rain covering all of Scotland, apart from the Hebrides and some areas of the western coast, from midday on Saturday until midday on Sunday
On Monday, from 11:00 to 21:00, a yellow warning for heavy showers and thunderstorms for all of central, southern and northern England apart from the south west - as well as all of central and southern Scotland.
Yellow alerts indicate a "slight chance" of power cuts, flooding for roads and businesses and some delays and cancellations to train and bus services, according to the Met Office.Yellow alerts indicate a "slight chance" of power cuts, flooding for roads and businesses and some delays and cancellations to train and bus services, according to the Met Office.
Stormy clouds gathered on the horizon towards Biscay in Cornwall on Saturday
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.
They have developed over northern France but they will be allowed to "grow" as they move north over the eastern half of the UK on Saturday.They have developed over northern France but they will be allowed to "grow" as they move north over the eastern half of the UK on Saturday.
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.