Weather tracker: Polar wind set to end warmth in US south and midwest

Spring-like weather experienced by many Americans to end, while heavy snow in Japan brings deadly conditionsA week of extremes in the US as Arctic air plunges southwards across many states, sweeping away record-breaking warmth from last weekend. With low pressure in the west drawing up warm, humid air from the Gulf of Mexico, much of the south and midwest basked in spring-like weather this weekend with temperatures widely an extraordinary 15-20C above normal for late December.This week, however, most people will ditch their summer clothes for hats and scarves as a ridge pressure builds across the west, allowing for a polar air mass to dive southward, bringing freezing temperatures and the risk of snow. Continue reading...