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Winter will arrive in the UK in earnest this week, thanks to a large area of high pressure over Iceland which will pull arctic air south.
As this cold air descends on the UK on Tuesday, northern Scotland will experience the first signs of this wintry weather, with daytime temperatures forecast to stay just above freezing with some possible sleet and snow flurries during the day. A cold front will move further south during Wednesday, bringing temperatures below the seasonal norm.
On Thursday and Friday, temperatures are expected to be 5C below average in many places, leading to widespread frost and possibly snow. The cold snap is expected to last until the weekend, although a low-pressure system will move in next week, which could initially bring sleet and snow to many parts of the UK, after which temperatures are expected to gradually rise closer to average. .
Much of Western Europe will also experience wintry weather. Temperatures will drop in Norway, Sweden and Ireland during the first half of the week, in some places up to 10C below the seasonal norm. By the latter part of the week, this icy blast will move south-west into parts of France, Belgium, Luxembourg and Germany.
By the end of the week, this cold air mass, along with a low pressure area moving eastward across Europe, could bring some significant snowfall to many places in Western Europe.
In contrast, central parts of South America are bound for heatwaves affecting northern Argentina, Paraguay and south-eastern Bolivia. High temperatures are expected to arrive on Tuesday, climbing 10C above the seasonal norm. By Wednesday afternoon, the anomaly will widen further, with some places reaching 47C on Thursday – 15C above average for the time of year. The heat wave will begin to ease on Saturday, although temperatures will remain above average.
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