Parts of the UK have had more than fortnight's rainfall in the past 24 hours and there is more to come as heavy thundery downpours sweep across the country, forecasters said.

Traffic disruption is possible as low pressure moves west across England, the Met Office said, after Somerset saw a day of dismal weather.

A yellow warning for rain is in place across the south of England valid until 10pm and the Environment Agency has 10 flood alerts in place, five in the south west and five in Wales.

A Met Office spokesman said an area of low low pressure moving through the south of the England and would affect an area south of a line between the Wash and Cardigan Bay in Wales.

"It is already bringing heavy showers to the south coast from Portsmouth westwards," he said.

"It is heavy rain that will become thundery in nature through the course of the day.

"We could see another 20mm of rain, so for a lot of areas that is a third of a month's rain. There is 40mm to 60mm possible in some places."

He added: "There is the possibility of disruption."

More rain is forecast for Somerset on Tuesday and Wednesday before the weather improves into the bank holiday weekend, the Met Office spokesman said.