A strong winter storm over the Northwestern U.S. is Sunday's main weather story. A broad low pressure system spinning over the Gulf of Alaska will push eastward and into British Columbia. This will push a trough of low pressure onshore that will extend into the Pacific Northwest.
Abundant moisture will flow in from the Pacific, allowing heavy snow showers to develop across western Washington and Oregon. The system's leading edge will kick up some scattered snow showers across northern Idaho and Montana, but snowfall accumulation will be light in the range of 2 to 4 inches.
In the Cascades, however, heavier snow showers are likely. Snowfall accumulation may reach up to 12 inches across the northern Washington Cascades, while only light precipitation is expected into Oregon. To the south, the fire danger will remain high across southern California as a ridge of high pressure allows for dry, warm, and windy conditions. Wind gusts will range from 30 to 40 mph in these areas.
In the East, a trough of low pressure will support widespread and light snow showers over the Great Lakes and Northeast. Snowfall accumulation will range from 1 to 2 inches from Michigan through New York. High pressure continues building over the Southeast and Gulf of Mexico.
This will allow for sunny skies and dry conditions to persist from the Gulf state through the eastern valleys and Mid-Atlantic states.
Temperatures in the lower 48 states ranged Saturday from a morning low of -17 degrees at Stanley, Idaho, to a high of 82 degrees at Opa Locka, Fla.
Weather Underground: http://www.wunderground.com
National Weather Service: http://iwin.nws.noaa.gov