What may be happening to the cold air mass as it moves southward from the Great Plains Explain what is happening to air along the cold front. Figures 1-4 are weather maps for a 24-hour period. The maps show the position of ystems and fronts in the United States every pennours beginning at 12:00 A.M. on Thursday. Examine the maps and think about what is occurring. Then answer the following questions.

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