Colorado low

A Colorado low is a low pressure that forms in southeastern Colorado or northeastern New Mexico, typically in the winter. After forming, the system moves across the Great Plains. Colorado lows produce heavy wintry precipitation, and have a general east to northeast movement, impacting regions as far north as Winnipeg and as far east as the Atlantic coast. If upper level conditions are right, the jet stream can push the low farther south, bringing wintry precipitation as far as Texas. When pushed this far south, the system is often referred to as a "blue norther". On the more typical track, a Colorado low can be similar to an Alberta clipper. Winter Colorado lows are responsible for a majority of the snow that the Midwest receives; however, summer systems can trigger vast, long-lasting thunderstorms. Spring and early summer Colorado low cyclogenesis can precipitate significant "syoptically evident" tornado outbreaks over the Great Plains and Midwest.

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Wikipedia