Swathes of the U.S. have been battered by intense snowstorms, with cold weather forecast for days of blizzards and freezing rain.
The massive storm system swept across parts of the Northwest, Great Plains and Southwest on Monday.
Snow fell as far south as Arizona, New Mexico and parts of California, and as far north as Idaho.
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The storm is expected to move slowly east across the U.S. to the northeast, where a blizzard warning will be issued later this week.
The National Weather Service (NWS) is warning of disruptions through Thursday.
“This developing storm system will cause substantial, widespread and impactful weather damage in the heart of the country this week,” it said.
Blizzard warnings have been issued for parts of Wyoming, Montana, South Dakota and Nebraska this week.
Up to 2 feet (60 centimeters) of snow and wind gusts of up to 60 mph are expected. A winter storm warning was also issued for North Dakota.
Officials in Pennington County, South Dakota tweeted: “Keep your shovel handy, buy your groceries & check other needed supplies. Roads will be impassable.”
Schools in Idaho, South Dakota and Nebraska delayed Monday’s start of classes or canceled classes entirely because of the snow.
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The NWS also warned of possible storms in Minnesota and Wisconsin, where freezing rain and up to half an inch of ice could occur.
The ice could down trees and power lines, leading to possible power outages, the NWS said.
Much of Europe was also hit with snow over the weekend, including the UK.
Heavy snow blanketed much of London on Sunday night, while Essex saw 7cm (2.7in).
Parts of northern Europe, including Germany and Lithuania, were also attacked over the weekend.