Heavy Snow over portions of Northern New England; Significant WinterStorm likely across parts of the Northern Plains and Upper Midwest...There is a Sight Risk of excessive rainfall over parts of the NorthernMid-Atlantic to Southern New England.There is a Slight Risk of severe thunderstorms over parts of theCentral/Southern Plains on Sunday.A Significant Winter Storm will develop over the Northern High Plains andmove into the Northern Plains, upper Mississippi Valley, and Upper GreatLakes from Saturday evening into Monday. The winter storm will behigh-impact and an extensive system producing widespread heavy snow andgusty winds that will persist over parts of the Northern Plains and UpperMidwest through Monday. Widespread heavy snow will spread across much ofcentral and eastern Montana by Saturday night, expand into the NorthernPlains/Upper Midwest on Sunday, and continue into Monday. There is a highchance (greater than 70%) of at least eight inches of snow extending fromcentral South Dakota northeastward to northeastern Minnesota andnorthwestern Wisconsin.In addition, the storm will create hazardous impacts from heavy snow, snowload, and wind. Moreover, heavy snow and gusty wind will produce areas ofblowing/drifting snow and possible blizzard conditions on Sunday intoMonday. Hazardous travel and road closures are expected late Saturday intoMonday. Strong winds and heavy, wet snow on trees and power lines maydamage trees and cause power outages.Furthermore, strong wind gusts over 50 mph on Sunday may result in poweroutages, blowing dust with reduced visibility, difficult travel, andproperty damage as High Wind Watches and Warnings are over theCentral/Southern Plains.Meanwhile, low pressure over Southern New England moves northeastward intothe Canadian Maritimes by Sunday. The storm will aid in producing heavysnow over parts of Northern New England through late Sunday morning.Additionally, heavy rain will develop over parts of the northernMid-Atlantic and Southern New England through late Saturday night.Therefore, the WPC has issued a Slight Risk (level 2/4) of excessiverainfall over the northern Mid-Atlantic/Southern New England throughSunday morning. The associated heavy rain will create mainly localizedareas of flash flooding, with urban areas, roads, and small streams themost vulnerable. On Sunday, the threat of excessive rainfall ends over theNortheast. The snow will continue through late Sunday morning overNorthern New England.Moreover, a front over the Great Basin/Southwest moves inland to theCentral/Southern High Plains by Sunday afternoon and continues eastward tothe Middle/Lower Mississippi Valley by Monday evening. The energyassociated with the boundary will create higher-elevation snow andlower-elevation rain over parts of the Pacific Northwest, California,Great Basin, Southwest, and central/Southern Rockies through Mondaymorning.Further, as the front and dryline move out of the Rockies on Sunday,showers and severe thunderstorms will develop over the Central/SouthernPlains. Therefore, the SPC has issued a Slight Risk (level 2/5) of severethunderstorms over parts of the Central/Southern Plains from Sunday intoMonday morning. The hazards associated with these thunderstorms arefrequent lightning, severe thunderstorm wind gusts, hail, and a fewtornadoes.On Monday, the front moves into the Lower Mississippi Valley, creatingshowers and severe thunderstorms. Therefore, the SPC has issued a SlightRisk (level 2/5) of severe thunderstorms over parts of the LowerMississippi Valley on Monday morning. The hazards associated with thesethunderstorms are frequent lightning, severe thunderstorm wind gusts,