October Snow and Frost

Snow began falling in the Northern Rockies in Montana on October 2nd. By the morning of October 4th, a significant snowstorm had developed in the Northern Plains:

Up to 14 inches fell in northern Minnesota (10 nnw Badger), and 3.5 inches fell in Grand Forks. On October 7th (today), cold air surging southward in the wake of the snowstorm prompted a frost advisory (blue) for Oklahoma City, and a hard freeze warning (dark blue) for Dodge City, where this morning's low was 29:

Freeze warnings are in light blue, and a gale warning is active for Lake Michigan. For tonight, frost advisories are in effect as far south as Abilene, TX: