Weather across America

(NATIONAL) Moderate to heavy snow from the Ohio Valley into the Lower Great Lakes and heavy snow over parts of New England, Marginal Risks of severe thunderstorms and excessive rainfall over parts of Central Gulf Coast and Southeast, and pockets of rain/freezing rain over parts of the Central Appalachians and parts of New England. 

A storm over the Southern Plains merged with a front and low pressure over Central Gulf Coast Sunday morning, tracking northward along the East Coast to Cape Cod by Monday and offshore northern New England by Tuesday. Moderate to heavy snowfall will blanket portions of the Northeast, especially for northern New England Sunday night and through most of Monday. Within this widespread area of precipitation there may be embedded pockets of rain and freezing rain. In addition to the snow, this system will also usher in gusty winds. Winter Weather Advisories and Winter Storm Watches span from western North Carolina to Downeast Maine. 

Meanwhile, the storm produced rain over parts of the Lower Mississippi and Tennessee Valleys early Sunday morning and showers/moderate to severe thunderstorms over the Central Gulf Coast. The Storm Prediction Center has identified parts of the Gulf Coast as having a Marginal Risk for severe storms through Monday morning. Weather Prediction Center has Marginal Risk areas in effect along the Gulf Coast and into the Southeast as well. The main hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, a few tornadoes, and a minimal threat of hail. The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain. 

Furthermore, as this system progresses eastward, rain will develop over parts of the Tennessee and Ohio Valleys Sunday and will then advance into the Mid-Atlantic Sunday night. Pockets of rain/freezing rain may also develop over parts of the Central Appalachians into the afternoon hours.

A front pressing through the Pacific Northwest Sunday will continue to move southward to northwest Mexico by the start of the work week.  The system will produce coastal rain and higher-elevation snow over the Northwest, the Intermountain Region/Great Basin and the Central Rockies Sunday before developing over parts of the Southwest and into the Central/Southern Rockies on Monday.