A pair of low pressure centers will track east-southeastward from the Midwest this evening to the East Coast by Tuesday morning.
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Precipitation will primarily be north of the attendant frontal boundary and may start off as a rain/snow mix but should changeover to all snow for locations from western New York into northwestern New Jersey where accumulations of 2 to 6 inches are expected (highest for areas of higher elevation).
Areas of light rain are expected to the south.
As low pressure tracks into the Atlantic, the cold front will settle into the southern U.S. and become slow moving, separating temperature departures of 5-15 degrees above average to the south of the front and about 5-15 degrees below average to the north of the front across the Great Plains.
Upper level troughing over the western U.S. will slowly edge east during the week, helping to support the return of low level moisture northward from the western Gulf of Mexico into the Southern Plains.
Starting Tuesday night, areas of heavy rain are expected to develop across eastern Oklahoma into northern Texas as moisture overruns the front, with the precipitation shifting east Wednesday morning and afternoon.
Given this area has experienced above average precipitation over recent days/weeks, the potential for flooding and flash flooding will be increased.
Out West, mean upper level troughing aloft will remain from the eastern Pacific into the Intermountain West.
A number of disturbances dropping south offshore of the West Coast and then eastward to the Rockies will be responsible for periods of rain and snow, with locally heavy snow from the mountains of southwestern Oregon into northern California with 1 to 2 feet in the forecast through Wednesday evening.
Snow will also spread into Nebraska and the Northern Plains on Tuesday into Wednesday.
Accumulations of 3 to 6 inches are expected from western South Dakota into much of North Dakota through Wednesday evening, with areas of snow expanding southward into Nebraska for Wednesday night. ■