A complex area of low pressure will impact the Northeast on Tuesday, while high pressure influences dry conditions over the western third of the country.
An area of low pressure will shift slowly eastward over the Great Lakes. This system will produce lake enhanced snow downwind of the Great Lakes, which will lead to locally heavy snow showers in parts of western Michigan and northern Indiana. Lighter snow showers will spread across the Midwest and the Tennessee Valley as an arctic air mass plunges southeastward. Temperatures will drop 10 to 25 degrees below normal across the Midwest, the Ohio Valley and the Southeast. A separate, more robust low pressure system will develop over the Mid-Atlantic. This system will push northeastward, generating a mixture of heavy rain and snow across the Mid-Atlantic and parts of southern New England. Light to moderate snow will linger over northern New England as an Atlantic system pushes north northeastward over southeast Canada.
To the west, a stationary front will extend south southeastward over south central Canada and the northern Plains. Mixed precipitation will develop along this frontal boundary over eastern Montana, North Dakota, South Dakota and northern Nebraska.
A pair of high pressure systems will continue to influence dry conditions west of the Continental Divide. Temperatures will remain 10 to 20 degrees above normal across southern California on Tuesday.
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