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Weather Underground Forecast for Sunday, December 11, 2016

A low pressure system will bring impacts to many states east of the Rockies on Sunday, while a moist air mass continues to shift across the Northwest.

An area of low pressure will strengthen as it moves east northeastward from the central Plains to the Great Lakes. This system will produce a mixture of heavy rain and snow across the northern Plains and the Midwest. The heaviest snow will focus over southeast Wisconsin, southern Michigan, northern Illinois, northern Indiana, northwest Pennsylvania and southwest New York. A warm frontal boundary will extend eastward ahead of the low pressure system. A relatively warm air mass will override cooler air, which could lead to the development of freezing rain in the central Appalachians. A cold frontal boundary will extend southwestward. As this frontal boundary pushes east southeastward, it will produce rain and embedded thunderstorms along the eastern tier of the southern Plains and into the Deep South. The most likely areas that will experience thunderstorms will be along the central Gulf Coast. Additionally, snow showers will trail this system over the central Rockies.

Meanwhile, a plume of moisture will continue to stream across the Northwest. This will result in moderate to heavy rain and mountain snow across the Pacific Northwest, the upper Intermountain West and the northern edge of California. Most of the Southwest can expect dry conditions on Sunday.

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