Periods of heavy rain possibly leading to flooding and disruption to transport is expected this week.

The Met Office yellow warning for rain is set to come into force from noon on Thursday, October 29, until 11.59pm on Friday, October 30.

Forecasters are warning that the heaviest rainfall is expected to be across the hills and mountains of north-west Wales where between 100 and 130 millimetres of rainfall is possible by the end of Friday.

They added that accumulations of 30-40 mm can be expected widely, whilst areas of higher ground exposed to strong southwesterly winds are likely to see 50-80 mm.

Chief Meteorologist Andy Page said: “Until the end of October we are looking at an unsettled spell of typical autumnal weather which will dominate the forecast. Every year we expect the remnants of decaying tropical hurricanes to disrupt conditions when they enter the North Atlantic.

“The remnants of former Hurricane Epsilon have been subsumed into another deep area of low pressure to the south-west of Iceland, and although the low centre is a long way from our shores and won’t cause disruption, the trailing weather fronts associated with this system will bring wind and rain to the UK, along with a potentially heavy swell.

“However, it is rain rather than wind that will dominate our attention later in the week with a so-called ‘warm conveyor’ set up to bring a flow of very moist and warm air to the UK from further south in the Atlantic, triggering heavy rainfall for high ground in the west of the UK. We have issued a Yellow warning covering parts of Wales and north-west England for Thursday and Friday as additional rainfall in these areas may lead to impacts, including flooding.

"Across the warning area accumulations of 30-40mm of rain can be expected, while isolated areas exposed the strong south-westerly winds could see 50-80mm. We expect the heaviest rainfall to occur in the mountains of Wales where some areas could witness 130mm of rainfall."

At the weekend, the forecast is showing potential for the remnants of ex-hurricane Zeta to move into the North Atlantic, with the associated moisture being entrained into the Atlantic frontal systems, to again bring the potential for further heavy rain to parts of the UK later in the weekend and into early next week.

However, confidence at this time range is fairly low for this aspect of the forecast.

Andy Page added: “We will continue to monitor the situation, issue warnings accordingly, and work with partners to provide advice to the public.”