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Weather Underground Forecast for Sunday, October 12, 2008.

The first large western snowstorm is expected to continue across the northern Intermountain West and northern part of the Rockies on Sunday. Snow will fall as far east as the mountains of western Colorado and the western Dakotas. The heaviest snow is expected from eastern Idaho into northern Wyoming and eastern Montana, where up to a foot or more can be expected.

In the mid-section of the nation, a strong frontal system will continue to push northeastward into the Plains Sunday. Moreover, the Pacific moisture will travel northeast from northwestern Mexico through eastern Four Corners and across the Plains. As a result, numerous showers and thunderstorms are expected to continue developing along and ahead of the front from New Mexico and western Texas northeastward across the Northern Plains and Upper Mississippi Valley. In particular, a risk of severe thunderstorms is expected across parts of the southern and central High Plains, with the main threat of large hail and damaging winds.

A huge ridge of high pressure will dominate across the rest of the nation, providing tranquil weather. The only exception will be over parts of the Southeast, where scattered showers and thunderstorms will be possible due to an old front remaining off the coast.

Temperature wise, it will be another chilly day across the Western U.S. Calm winds and clear skies will allow temperatures to drop to record or near record levels Sunday morning over portions of the Pacific Northwest, and California as an unseasonably cool and dry airmass resides. After a cold morning, temperatures should rebound back to the normal values as a ridge of high pressure begins to uild towards the West Coast. The Southern and Central U.S. will be the warmest region on Sunday. Temperatures are expected to climb into the 70s and 80s in the afternoon.

Temperatures in the Lower 48 states Saturday ranged from a low of 13 degrees at Idaho City, Idaho to a high of 96 degrees at Cotulla, Texas.