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A 21-hour period of snowfall expected to sweep parts of the UK in mid-December as an Arctic blast moves south. While the system will deliver heavy snow to northern regions, areas further south can anticipate rain or periods of dry weather. The forecast supports bookmakers' decision to slash odds on a White Christmas this year.

Snowfall timeline: Britain is bracing for a single, long-duration 21-hour snow onslaught expected to begin on December 15 . The wintry showers are forecast to start in northern Scotland before gradually moving southwards throughout the day.

Heaviest Hit Regions: The deepest snowfall is anticipated in northern areas, with the heaviest amounts expected in Galloway Forest Park in southern Scotland, the Lake District , and the Pennines . By 3 pm on Decemb

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