Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 300 AM EST Mon Feb 22 2021 Valid 12Z Mon Feb 22 2021 - 12Z Wed Feb 24 2021 ...Snow for parts of the Northeast and Central Appalachians through today... ...Heavy snow over the Cascades and Northern Rockies... ...Central U.S. to warm up as Northwest cools down... An amplified upper-level trough will traverse the eastern third of the country today. As a result, a low pressure system will cross the Midwest and produce light to moderate snow across much of the Northeast, with locally heavier snow downwind of Lake Ontario and the higher elevation areas of New England. Generally, a wide swath of 3-6 inches of snow is possible across the Northeast and Central Appalachians, while areas downwind of Lake Ontario may see over a foot of snow. Rain is expected from the Mid-Atlantic down the eastern seaboard today. Scattered to isolated thunderstorms are possible across Florida and North Carolina's Outer Banks. Temperatures are expected to be below average on the backside of this system across the Midwest and Mississippi Valleys today. As this system departs another one will sweep across Canada and graze the Great Lakes tonight, bringing some additional lake effect snow to the region. Another upper-level disturbance will impact the Northwest through Tuesday by producing heavy mountain snow across the Cascades and Northern Rockies, and potentially heavy rain along the Pacific Northwest coast and inland areas. Heavy snow is likely to slam the Northern Cascades, where multiple feet may have fallen by Wednesday morning. Winter Storm Warnings are in effect for much of the northern Cascades. Parts of the Northern Rockies are also likely receive over a foot of snow. Blizzard, on top of, Winter Storm Warnings are in effect for parts of the Montana Rockies due to the additional wind threat in the area. High Wind Warnings are in effect over parts of the Northern Rockies due to a tightened pressure gradient between high pressure to the east and the approaching low pressure system to the west. Temperatures across the Great Plains are generally expected to be above average today as the northwest system moves across the Rockies. Temperatures will begin falling below average across the Northwest, on the backside of the aforementioned frontal system today. This new system will eventually emerge over the Northern Plains and Upper Midwest on Tuesday before bringing another round of winter weather to the Great Lakes by midweek. Kebede Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php