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Weather Underground Forecast for Saturday, December 20, 2014

Unsettled weather will persist over the Northwest on Saturday, while a low pressure system will slide across the Gulf Coast.

Several waves of low pressure will move across the northwestern corner of the country. Heavy rain will impact western Washington, western Oregon and northwest California. There will be a threat of flash flooding across the northwestern coast of California, the coast of Oregon and southwest Washington. In addition, heavy snow showers will affect the Cascades and the northern Sierra Nevada. Snow accumulations are forecast to exceed one foot across the Washington Cascades, especially along western facing mountain slopes. Meanwhile, heavy snow showers will spread across the northern Rockies, while a mixture of rain and snow will be possible over the Great Basin. A ridge of high pressure over the eastern Pacific will keep conditions relatively clear across the Southwest and the southern Rockies.

A low pressure system over the Gulf of Mexico will slide eastward on Saturday. As this system skims across the central Gulf Coast, scattered showers will develop over the Deep South and the Southeast. There will be a chance of light snow showers over the southern Appalachians.

Scattered snow showers will pop up across the northern Plains and the upper Midwest as a wave of low pressure deteriorates over the region. High pressure over southeast Canada will keep weather conditions cool and dry across the Great Lakes and the Northeast.

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