Storm Katie is on its way to Kent and could cause power cuts, fallen trees and travel problems, the Met Office has warned.

A severe weather warning for strong winds has been upgraded this afternoon from 'yellow' to 'amber' as gusts of up to 70mph are predicted from the early hours of tomorrow.

The 'amber' warning is due to be in place from 12.15am to noon tomorrow, while the 'yellow' warning for heavy rain covers 9pm today to noon tomorrow.

A Met Office spokesman said: "Winds will strengthen markedly across southern England and south Wales from the start of Monday, with the potential for 50-60 mph gusts inland and 70 mph gusts around coasts exposed to the south and west.

"Additional hazards may include large waves around exposed coasts as well as a period of heavy rain.

"Please be aware of the potential for disruption to outdoor activities and travel, as well as the possibility of fallen trees and temporary interruptions to power supplies."

Storm Katie is the 11th storm named by the Met Office since last autumn.

Train operator Southeastern has announced there will be speed restrictions on the lines between Ramsgate and Faversham and Ramsgate and Dover Priory from late today until about 9am tomorrow.

Other lines due to see speed limits include Folkestone Central to Sevenoaks and Ashford to Swanley.

Southeastern advises passengers to check for the latest details before they travel.

And Highways England has advised drivers of high-sided vehicles, anyone towing caravans or riding motorbikes to take extra care.

A spokesman added: "The winds will be accompanied by outbreaks of heavy rain and as a result driving conditions will be hazardous for all vehicles.

"As the severe weather coincides with the Easter holiday there are more likely to be vehicles towing caravans and trailers or with roof racks and top boxes fitted.

"The wind strength will ease in the afternoon from the west as the low pressure area associated with Storm Katie moves into the North Sea."