Frost and Freeze Threat Continues

Jon Erdman Updated: Oct 8, 2012, 10:05 AM EDT weather.com

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I consider September a "lagging month".  Yes, fall officially arrives around the 21st of the month each year, but summer's heat can hang on stubbornly, and not simply in the South.

This year, this heat lagged into the first few days of October.  Then came a dramatic reality-check.  

Canadian Chiller

An upper-level wind pattern tapping Arctic air is shoving a cold front south into the U.S.  Check out these amazing changes:

- Billings, Mont. went from a high of 82° Tuesday to just over 2" of snow the following day, their first snow of the season.

- According to the National Weather Service in Boulder, Colo., the town of Sedgwick, Colo. had a daytime high of 90° Wednesday followed by a freeze the following morning.  Talk about wardrobe confusion!