A deep low-pressure system off Britain’s coast will grow from the union of Martin, the seventh hurricane to spawn in the Atlantic this season, and a separate cyclonic weather feature. While the churning low will anchor off the west coast this weekend making no direct impact, it will hurl bouts of wind and rain towards Britain.
The heaviest rain will set in on Saturday although northern regions are on alert for further downpours on Sunday.
The weather will be ‘twisted and turned’ by the jet stream as it swoops over the county, according to the Met Office.
Meteorologist Aidan McGivern said: “Waiting over the Atlantic is a very deep area of low pressure,
“It has come from Hurricane Martin and another area of low pressure over north America, and they are going to join together.
“Martin transforms, with the help of the jet stream into a mid-latitude area of low pressure, no longer a hurricane but it is sitting there over the mid-Atlantic.
“This low won’t really affect the UK, but we are going to see the weather thrown ahead of this low, and it will lead to another bout of rain and strengthening winds on Saturday.”
Southern regions will turn drier through the weekend while the north braces for further downpours, he warned.
He said: “By Sunday, the rain is clearing the southeast, but it could linger for a time or even clear and return depending on how the jet stream starts to twist it and turn it.
“Sunday will see largely brighter skies with blustery showers, and the heaviest and most frequent showers will be to the northwest of Scotland with some hail and thunder.”
Britons getting ready for Guy Fawkes celebrations are warned to expect soggy bonfire building through the day before an evening soaking.
With low pressure to the west of the UK, western regions stand to fare worst although nowhere is safe from the deluge.
Jim Dale, meteorologist for British Weather Services, said: “The western half of the UK is looking like it will get the worst of the weather over the weekend, while eastern regions look like they are going to be reasonably in the right position to survive with a dry evening.
“Some of the showers may be heavy as they will be associated with this large area of low pressure in the Atlantic.
“There is also the chance of some fairly stiff winds and in the showers, it won’t feel particularly warm, although there is no indication of anything unusually cold this weekend.”
The grotty forecast has prompted bookmaker Coral to slash the odds to 1-2 on the wettest November on record.
Spokesman John Hill said: “Bonfire Night may be a washout for many people this year, as the rain looks set to continue to fall.
“With a wet outlook ahead, we make it odds-on for this month to end as a record-wet November.”
Exacta Weather forecaster James Madden added: “With developing low pressure this weekend, we expect to see a significant rise in the risk of unsettled weather and the chance of stormy conditions developing.”
Martin is the seventh hurricane to form in the Atlantic this season, and follows, among others, Fiona, Earl and Ian which wrought havoc earlier in this year.