Temperatures are set to plunge by as much as 10C by the end of this month with snow warnings now being issued for the UK.
Meteorologists are expecting the white stuff to fall “as October moves into November” and as the autumnal conditions kick in.
Mercury levels are expected to stay normal for the middle of October ahead of a colder front moving in bringing freezing weather.
It will move down later this week from the North West of Scotland towards the North West and then onto the Midlands.
A freezing polar vortex could blast the country within weeks, bringing with it a “white Halloween” for some.
There is also a chance of heavy rain in parts of the UK in the coming weeks and temperatures falling to as low as 6C in London.
Greg Dewhurst, a Met Office senior meteorologist, told The Sun: “We’re likely to see some snowy weather in higher parts as October moves into November.
“Likely areas to be affected are the Scottish mountains as well as higher ground in northern England and northern Wales.
“Low areas are unlikely to see any.
“It’s quite normal for this time of year.”
Accuweather meteorologists expect a large weather front to bring cold and stormy conditions to UK shores which will last into November.
October 24 is the suggested date for the mercury to drop to 0C north of the Scottish border with some parts of the country expecting lows of -1C.
While Scotland freezes, temperatures will remain at 4C across England. However, some areas in the north will plummet below -2C.
These icy conditions will remain through October 26 – with most of England still balancing above the freezing point.
Some parts of northern Scotland and the east coast of England will stay a little warmer – with the UK’s highest temperature of 5C.
The predicted temperature drop is up to 4C lower than it should be for this time of year.
Former BBC weatherman John Hammond said the freezing weather could also be brought about due to the weakening of the polar vortex with less strong winds than normal over the Arctic circle.
“There are signs of the stratosphere experiencing an unusual warming in the next few days, causing the polar vortex above the Arctic Circle to become less strong than normal later in October,” he told the Sun.
“These high-altitude winds normally intensify as we head towards winter.
“An unusual weakening of the polar vortex may well have impacts on our weather later through autumn and into early winter.
“Sudden stratospheric warming’ events can sometimes lead the polar vortex to go into reverse, which can have dramatic impacts on winter weather and increase the chances of severe cold.”
Here is the weather forecast this week for Lancashire and the rest of the North West:
Rather cloudy at first, with the chance of some light rain or drizzle in places. Slowly brightening up through the morning, with sunny intervals developing by the afternoon. In any sunshine it will feel relatively warm given light winds. Maximum temperature 16 °C.
It will stay mostly cloudy overnight but some clearer intervals are likely and this will allow a few mist and fog patches to form in places. Minimum temperature 9 °C.
Thursday will be another rather cloudy day but some brief brighter intervals are still likely. Thickening cloud later in the day across Cumbria with rain likely arriving by dark. Maximum temperature 15 °C.
Outlook for Friday to Sunday:
Rain clearing south on Thursday evening. Colder but much sunnier on Friday with a local frost at first. Rather cloudy on Saturday and Sunday with occasional light rain in Cumbria.
Updated: 05:00 (UTC+1) on Wed 13 Oct 2021
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