Weather Underground Forecast for Sunday, November 18, 2012.
The West remains under active weather conditions on Sunday, while the East will see another dry and quiet day. A strong low pressure system dropping into the Pacific Northwest from the Gulf of Alaska will continue pushing a strong cold front over the Western states. This system will have abundant moisture associated with it, allowing for rain and snow showers to develop as it moves over the Intermountain West and Great Basin, into the Northern and Central Rockies late Sunday night. Expect periods of heavy snow to develop over parts of Idaho and western Montana, with snowfall accumulations ranging from 4 to 9 inches. This frontal boundary has a history of producing strong winds, thus, expect blowing snow and poor visibility at highest mountain passes. Strong winds will range from 35 to 45 mph, with gusts over 50 mph in the mountains. The tail end of this front will trek southeastward through California on Sunday, bringing more snow to the Sierras. Expect another 4 to 6 inches of new snow across the Sierras. Strong winds will also persist in these areas with gusts over 60 mph in the mountains. Meanwhile, the back side of this system continues pushing cool air and moisture onshore from the Pacific Ocean. This will allow for heavy rain and snow showers to persist for Washington, Oregon, and northern California. Snowfall totals in the Cascades will range from 3 to 7 inches on Sunday.
In the center of the nation, a weak trough of low pressure moves over the Central and Southern Plains, advancing toward the Mid-Mississippi River Valley. This system will have enough moisture associated with it to produce a few scattered showers and thunderstorms throughout the day. Severe storms are not anticipated in these areas.
Temperatures in the Lower 48 states Saturday have ranged from a morning low of 10 degrees at Alamosa, CO to a high of 82 degrees at Punta Gora, Fla.