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[January 07, 2011] (AP) The Pacific Northwest will remain wet and snowy, while snow will also persist across the Northeast on Friday.

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A low pressure system over the Great Lakes will continue moving eastward and into the northeastern U.S. Throughout the day, this system will push a cold front southeastward over the Ohio River Valley and toward the East Coast.

Expect more snow across the northern Appalachian Mountains, with accumulation ranging from 2 to 4 inches. Heavier snowfall is likely along the western and northwestern areas of the Appalachians, as upslope flow will aid in the development of snowfall. More lake-effect snow will develop over the eastern shores of the Great Lakes as strong flow from the west persists.

Cold air from Canada will pour in behind this system. Expect cold conditions to persist in the northern Plains and upper Midwest, with highs ranging in the teens and overnight lows dipping to the negative teens. Strong winds with gusts up to 25 mph are also expected; thus, wind chills overnight will dip into the negative 30s.

The Midwest and Ohio River Valley will remain slightly warmer with highs in the 20s and 30s.

Out West, a low pressure system will dip in from British Columbia and push a front over the Pacific Northwest. This system will bring more rain to Washington and Portland, with snow in the Cascades and northern Rockies. High pressure will remain over California and the Southwest, allowing for more cool and sunny weather.

In the South, high pressure dominates the southeastern U.S. and will allow for cool and dry conditions. Highs in the 50s and 60s will prevail, with overnight lows in the 30s. A cold front moving through the southern Plains will create another chilly day for Texas and Oklahoma.

Temperatures in the Lower 48 states Thursday ranged from a morning low of minus 22 degrees at Roseau, Minn., to a high of 81 degrees at Kendall, Fla.

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Online:

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

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

[Associated Press article from Weather Underground]