/ CBS/AP

A storm impacting Rockies and Plains states has met the scientific definition of what’s commonly known as a “bomb cyclone.” It’s the second such blast to hit the region in less than a month. Hundreds of flights have been canceled and some roads in the region are becoming impassable or accidents have already occurred.

The weather phenomenon is difficult to explain in layman’s terms. Essentially, air pressure drops rapidly and a storm strengthens explosively.

Weather service meteorologist Mike Connelly in South Dakota said the storm could be “historic” in terms of widespread heavy snow. He expects some records to be set. Wind gusts could reach up to 50 mph.

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Blizzard warnings were posted in at least six states from Colorado to Minnesota as the storm developed, CBS News correspondent Adriana Diaz reports. The National Weather Service…