Temperatures in France and England could rise by 15C, while hot air could to give way to snow in parts of US
After a prolonged spell of cool conditions across much of Europe, a dramatic swing in temperatures is expected in the coming days as warmer air surges north into western and central parts of the continent.
A large blocking high over the North Atlantic and slow-moving low pressure across southern Scandinavia dragged Arctic air southwards last week, sending temperatures 10-15C below the seasonal average for more than a week.
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