More than 100mm of rain is expected to fall on parts of Britain this week – double the average for the whole of June.

On Monday the south east was the worst hit as flooding in Kent closed all lines through Orpington railway station for several hours, while police shut a section of the M25 overnight after discovering two sinkholes on the central reservation.

The motorway was closed in both directions and Highways England warned it was expected to remain shut throughout most of this morning.

Highways England: #M25 this is the incident J7 to J8 both directions we currently have recovery on scene who are working to recover this vehicle as quickly and safety as possible.
Image: A lorry overturned in high winds on the M25 between junctions seven and eight

National Rail has also warned that Southern and Thameslink trains will be heavily impacted during the morning commute, with some services delayed or cancelled due to flooding.

Today, north-eastern parts of England and the Midlands are expected to bear the brunt of the downpours, with a yellow warning in place until midnight.

M20 Jct 2-1 where river burst its banks and flooded M20. Pic: Kent Police
Image: The M20 was flooded after a river burst its banks. Pic: Kent Police

Some areas set to see up to 60mm of rain, particularly over the first half of the day.

Another warning covers Devon and Somerset, where similar conditions are expected.

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A total of 31 flood alerts – which mean flooding is possible – are in place across the country.

The Environment Agency has issued three flood warnings in south-east England, for the River Wandle at Morden, south London, the Emm Brook at Wokingham and Ravensbourne at Bromley.

The agency said on its website: “River levels have risen as a result of localised thunderstorms. Flooding of property is expected imminently. Please take action.”

On Wednesday and Thursday, some parts of the UK could be struck by 60mm to 80mm of rain, and possibly even up to 100mm.

Met Office meteorologist Alex Burkill described the figures as the “worst-case scenarios” but added that people need “to be aware that we’re in for some treacherous weather”.

“If you add it all up some places are likely to see over 100mm this week, which is around double the average they would get in the whole of June.”

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