A yellow thunderstorm warning is in effect for southern and southeast England until 3pm on Tuesday as downpours continue across parts of the UK.

Meanwhile overnight engineering works that overran delayed commuters between Bracknell and Wokingham in Berkshire, with rain also causing delays between Nottingham and Mansfield.

Further north, heavy flooding caused the railway station at Carnforth, Lancaster, to close until midday, while ScotRail implemented blanket speed reductions across its services during the morning.

There were also reports of fallen trees, including one in Tower Hamlets, London.

The Environment Agency had 12 flood warnings in place by midday, meaning flooding is expected, with 99 lesser flood alerts also active.

A Met Office meteorologist has warned the wet weather, which he said was caused by a "very active" jet stream, shows "no sign" of stopping in the next week.

Marco Petagna said much of the UK is "in the firing line" with "pretty unsettled" weather expected over the next week.

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Mr Petagna said Storm Debi had been expected to clear away from the UK to the east in the early hours of Tuesday, but "wet and windy weather" should linger.

He said "heavy and potentially thundery showers" will move eastwards across the south of England.

"We could see 15-20mm, almost an inch, of rain across some southern counties of England combined with fairly gusty winds as well," he said.

"A week's worth of rain could fall in an hour or two in that warning area and you could see wind speeds of 40-50mph.

"If you are in that warning area, it is going to be quite tricky [to travel].

"Allow extra time to travel and keep tuned to the forecast overnight.

"If you are out and about, take extra care and be prepared to see thundery showers."

Despite the wet weather, fairly normal temperatures for this time of year of 9-12C are expected.