Nick Wiltgen Updated: Oct 4, 2012, 4:54 PM EDT weather.com
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This first week of October, we're tracking not one, but two systems forecast to generate snow, the first in the season for some, as well as a pronounced plunge of cold air that will affect many millions more.  
Let's start with a look at the temperature nosedive.
Canadian Chiller
Turning Much Colder
The cold air made its first appearance in the Lower 48 late Tuesday, entering via Montana. Cut Bank, near the Canadian border, gusted to 55 mph with the initial push of colder air.
It will be a long time before the cold air stops its southward march.
It's a pretty sharp Arctic front pushing in. During the heart of winter, we'd be talking subzero temperatures and bitterly cold wind chills in the Plains and northern Rockies.
http://www.weather.com/news/weather-winter/northern-rockies-plains-cold-snow-20121002
http://www.weather.com/news/weather-winter/northern-rockies-plains-cold-snow-20121002
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