Powerful cold front to usher in winter across the U.S., but it may not mean heavy snow

For the tens of millions who live in the Midwest, Mississippi River Valley, Ohio Valley, and the East Coast, the first taste of true winter weather is just days away. Ushered in by a powerful cold front, the cold air, with high temperatures running 10 to 15 degrees below average, will come as a shock following one of the warmest fall seasons on record. 

Computer models are in agreement that the weather pattern across the Northern Hemisphere will become extremely amplified, which means that the jet stream — that high altitude superhighway of winds that steers weather systems and forms the boundaries between air masses — will carve out large dips, or troughs, as well as strong, practically immovable “blocking” ridges. Read more…

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Source: Mashable | Powerful cold front to usher in winter across the U.S., but it may not mean heavy snow