1971 had been a relatively mild winter east of the Mississippi. Many areas had been bathed in warmth and humidity for much of February. Such was the situation on the morning of February 21. Meanwhile bitter cold that had been locked in the Arctic regions of Canada was finally able to break free as the jet stream, that up to the point in the winter has remained far north, finally plunged southward.

As the brutal cold moved into the nation’s heartland it came into direct conflict with the early springtime conditions. In areas where the cold became quickly established snow developed and tuned into an all-out blizzard. By the morning of February 22 1-3 feet of snow-covered areas from Texas to Iowa, including drifts to 20 feet high. But the most violent impact of the clash of airmasses occurred in the warm sector where a vicious tornado outbreak killed 212 people. 

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