Winter storm continues in the West with heavy mountain snow, widespreaddamaging winds, and powerful blizzard conditions in the Sierra Nevada...Accumulating snowfall near the Canadian border across Montana and NorthDakota with a wintry mix from North Dakota to northern Minnesota.A coastal storm with widespread rainfall will exit New England onSunday but another coastal storm is forecast to bring another round ofrain into the Mid-Atlantic coast later on Monday.Much above average, Spring-like temperatures shifting from thePlains/Midwest into the Northeast as Critical Fire Weather threat persistsin the central/southern High Plains.A significant winter storm remains in progress across much of the West,including dangerous, blizzard conditions for the Sierra Nevada as anamplified upper-level trough forces its way into the western U.S. Amulti-day influx of moisture from the Pacific interacting with colder airpushing southward from Canada is bringing heavy higher elevation, mountainsnows across most of the ranges of the Pacific Northwest, northern/centralCalifornia, the Great Basin, and the northern/central Rockies. Theheaviest precipitation associated with this system will continue to impactthese areas through tonight into Sunday morning. In addition, widespreadwind-related advisories and warnings remain in effect across much of thegreater western U.S. as wind gusts reach upwards of 55 mph, with gusts ashigh as 75 mph for higher elevations, leading to the risk of downed treesand power lines. The combination of snow and high winds is most intense inthe Sierra Nevada into tonight, where heavy snow rates exceeding 3" perhour and winds gusting over 100 mph are causing significant blowing,drifting snow and whiteout conditions, making travel impossible throughthe area. Additional 2 feet of snow, on top of a few feet of recentsnowfall, can be expected along the Sierra Nevada through Sunday. The mostintense snow and wind should begin to wind down later on Sunday butadditional energy from the Pacific will keep light to moderateprecipitation in place through Monday across the northwestern U.S. throughMonday, with another system forecast to reach northern California later onMonday. High temperatures will be below average this weekend with thecolder airmass moving in, with highs in the teens and 20s for the NorthernRockies; 30s and 40s for the Pacific Northwest, northern California, theGreat Basin, and central Rockies; 50s for central California; and 60s forsouthern California. Temperatures will be warmer into the Southwest withhighs in the 70s.Along the East Coast, a low pressure system tracking along a coastal frontup the Mid-Atlantic coast continues to bring widespread rainfall acrossNew England into tonight.  This system is forecast to move east of CapeCod on Sunday, gradually bringing the rain out into the Atlantic later onSunday.  However, the trailing portion of the front is forecast to becomestationary just off the coast of the southeastern U.S. where another waveof low pressure is forecast to develop.  Widespread well above average, Spring-like temperatures are forecast tocontinue for much of the Plains and Midwest for the remainder of theweekend into Monday. The greatest anomalies will be centered over portionsof the central/northern Plains and Upper Midwest Saturday, spreading intothe Great Lakes and Middle Mississippi/Ohio Valleys on Sunday, whereforecast highs reaching well into the 60s and 70s are upwards of 25-35degrees above average.