Met Office verdict on when UK temperatures will plunge 10C with polar plume

The Met Office has issued a verdict on a predicted incoming 10C temperature drop, with a polar plume captured on maps looking set to creep over the UK this weekend.

The October “Indian summer” is expected to come to a screeching halt this week, returning the mercury to its usual range after the month started above its historic averages.

Forecasters expect the last days of unusual highs to fall between Wednesday, October 11 and Friday, October 13, as England grows increasingly wet and Wales, Northern Ireland and Scotland increasingly cold.

Met Office meteorologists have pinpointed the days with the most profound changes this week.

In some cases, the agency has advised, temperatures may fall as low as 3C, and snow may even descend on the mountaintops of Scotland.

READ MORE: European holiday islands loved by Brits hit with brutal 34C October heatwave

The latest forecasts from the Met Office suggest temperatures will reach 20C in London for the last time on October 11, with other southern cities – such as Cardiff and Plymouth – seeing 19C and 18C.

From October 12, the mercury will start plummeting, placing those areas in line with those further north, between 15C and 17C, the highest being in Cornwall.

By the weekend, temperatures should fall as low as 10C in formerly 20C areas during the day, the Met Office has said, and even lower at night.

Temperature maps released by the agency show lows of 3C at night in Glasgow, while London and Manchester drop to 6C.

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The changes will leave some people with weather whiplash as the polar plume brings temperatures down from highs of 25C in the south, ushering in a nearly 20C change.

Heavy rain is expected to fall across Wales on Wednesday, with England and Wales tipped for a “very wet day” this coming Friday as colder conditions “become established from the north”.

The Met Office has warned there is a “cold snap” on the horizon, with the incoming chilly system likely to bring rain which, in turn, could become snow.

Brent Walker, the Met Office’s Deputy Chief Meteorologist, said an incoming cold mass would bring temperatures down for “all regions of the UK”, and added that some areas would see the first autumn frost.

He said: โ€œWith high pressure continuing to dominate our weather early next week, it will start largely fine, settled, and cool by day, with cold nights and a risk of rural air frosts in places.

“Any early morning mist or fog should clear quickly and there could be a few showers possible around some coasts at times.โ€

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