70 million in path of 'bomb cyclone' across central US

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For a storm to be classified as a bomb, the barometric pressure has to drop by at least 24 millibars over a 24-hour period.

The weather service said the precipitation will be a wintry mix of rain and heavy snow, but the type depends on the location.

"Heavy rains.isolated flooding and severe weather will accompany these thunderstorms as they march fairly quickly eastward", the weather service predicts.

The storm will sweep right through the Rockies, the Upper Midwest, the central and northern Plains and more of the USA heartland. Wind gusts of 50mph to 70mph are expected across Colorado, New Mexico, Oklahoma, and Texas, while some areas could see hurricane-force gusts of 100mph.

A storm system that could generate severe weather in Alabama tomorrow is bringing "historic" blizzard conditions to parts of the Great Plains today, according to the National Weather Service.

Travel: The National Weather Service for Salt Lake City said on Wednesday it might be better to wait until Thursday to start traveling.

Tracking website FlightAware said that hundreds of flights have been canceled. The powerful winds have left over 200,000 Denver area residents without power while Colorado Gov. Jared Polis has activated the Colorado National Guard for search and rescue operations for stranded drivers in the blizzard. Morning rain in Denver quickly turned to snow by afternoon with the potential of 10 inches of powder to fall in the state's capital, with even more in the mountains and plains to the east.

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"'We are anticipating some possible delays and cancellations, be sure to check your flight status with your airline".

Many police departments across the state have sent out blizzard survival tips, urging people to carry emergency kits with them if they venture out into the formidable weather. The increasingly wide undulations of the jet stream - the wind highway that blows from west to east around the Northern Hemisphere - has allowed for more extreme temperature fluctuations in the continental U.S. And sea surface temperatures, which have been steadily rising, also affect the intensity of storms.

It claimed blizzard conditions are possible for the Central and Northern High Plains.

The NWS has issued flood watches along the Missouri River throughout the Midwest and Great Plains through midday Thursday.

Denver is under a blizzard warming Wednesday, from 10 a.m to midnight, and forecasters with the National Weather Service are calling for 70 miles per hour winds with up to 12 inches of snow.

The snow wasn't falling as much at about 3:40 p.m. but the high winds were creating major visibility problems.

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