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[October 21, 2011] (AP) Active weather diminishes in the Northeast, but returns to the Northwest on Friday. A low pressure system over the Great Lakes continues moving northeastward and into eastern Canada.

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Thus, scattered showers will diminish across the Great Lakes and Northeast as this system exits the region throughout the day. Expect a few light showers with rainfall totals around an inch. Meanwhile, the backside of this system continues to pull in cool air from Canada. Frost and freeze advisories remain in effect along the Mississippi River Valley as overnight lows will dip into the mid- to upper 30s, possibly into the 20s in the upper Midwest. Expect daytime highs to remain 10 to 15 degrees below seasonable across the eastern valleys.

In the West, a ridge of high pressure remains the dominant weather feature for the Rocky Mountains and Plains. This will allow for plenty of sunshine with warm temperatures. Highs will range in the 50s and 60s across the northern Plains and upper Midwest, while the southern Plains remain in the 70s and 80s.

Active weather returns to the Pacific Northwest as a cold front stretches in from British Columbia. This will kick up scattered rain showers across Washington and Oregon, with snow anticipated at higher elevations. Expect 1 to 3 inches of snow above 7,000 feet across the Cascades.

Temperatures in the Lower 48 states Thursday ranged from a morning low of 15 degrees at Rock Springs, Wyo., to a high of 91 degrees at Gila Bend, Ariz.

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Online:

Weather Underground: http://www.wunderground.com/

National Weather Service:
http://iwin.nws.noaa.gov/

Intellicast:
http://www.intellicast.com/

[Associated Press article from Weather Underground]