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Weather Underground Forecast for Sunday, December 21, 2014

A low pressure system will impact the Northwest on Sunday, while unsettled weather will persist across the Southeast.

A low pressure system will move east southeastward over southwest Canada and the upper Intermountain West. A cold frontal boundary associated with this system will extend southwestward. Heavy rain and mountain snow will continue to develop across the Pacific Northwest. Heavy rain could lead to flash flooding along the coasts of southwest Washington, western Oregon and northwest California. Heavy snow showers are also forecast for the northern Cascades, especially along western facing mountain slopes. In addition, widespread heavy snow showers will affect the northern and central Rockies, while a mixture of rain and snow will develop across the northern tier of the Great Basin. Snow accumulations will range between 6.0 to 12.0 inches across favorable mountain slopes. A ridge of high pressure over the eastern Pacific will keep weather conditions pleasant from southern California to the southern Plains.

A disturbance over the Gulf of Mexico will trigger rain and thunderstorms across the central and eastern Gulf Coast, the Southeast and the southern Mid-Atlantic. To the north, a light mixture of rain and snow will be possible over the coast of New England.

Meanwhile, there will be a slight chance of freezing rain over the Dakotas during the late afternoon and evening hours of Sunday. Light, scattered snow showers will also be possible over the upper Midwest.

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