A big shift in the U.S. weather pattern will occur over the next two days. An upper-level system is moving across southern California and the Southwest today, bringing a quick burst of mountain snow to southern California today and the Southwest Friday. Winter Storm Warnings and Winter Weather Advisories are in effect across the south-central New Mexico mountains for Friday. Snow accumulations will range from 7 to 14 inches.
The system will jump out onto the southern Plains later Friday and early Saturday and a new low pressure will develop across southern Texas. This system will quickly push northeastward across the southern Gulf Coast. Tapping the Gulf of Mexico, it will bring heavy rain and embedded thunderstorms form the Rio Grande all of the way into the Southeast Saturday and Saturday night. A quick to 2 to 3 inches will fall, bringing drought relief along with flash flooding to Houston, New Orleans and Pensacola, Fla. A Flood Watch has already bee posted around the Houston area.
On Saturday night and early Sunday, this quick-moving storm will push across the Carolinas and will interact with another system moving across the Great Lakes. A coastal storm will then develop off the Mid-Atlantic Coast.
The developing coastal storm along with cold air settling over the interior Northeast and Mid-Atlantic is presenting forecast troubles. As it looks right now, accumulating snow will be possible over the Appalachians from Virginia into upstate New York with the line between rain, wintry mix and snow setting up along the I-95 corridor early Sunday.
On Sunday, the coastal storm will be off the southern New England coast, bringing a quick burst of snow to the Mid-Atlantic as it exits. Interior New England could see heavier snow while southern New England will be in line for a wintry mix.
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