Significant Winter Storm across parts of the Northern Plains and UpperMidwestThere is a Sight Risk of excessive rainfall over parts of theMiddle/Lower Mississippi and Tennessee Valleys on Monday and over parts ofthe Central Gulf Coast on Tuesday.There is an Enhanced Risk of severe thunderstorms over parts of theCentral/Southern Plains on Sunday and the Lower Mississippi Valley onMonday.A Significant Winter Storm will develop over the Northern/Central Plains,Upper Mississippi Valley, and Upper Great Lakes from Sunday evening intoTuesday. The winter storm will be high-impact and an extensive systemproducing widespread heavy snow and gusty winds that will persistthroughout the Northern Plains and Upper Midwest through Tuesday. Heavysnow will spread across much of the Northern Plains/Upper Midwest onSunday and continue into Monday. There is a high chance (greater than 70%)of at least eight inches of snow extending from northern Nebraska andcentral 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. Likewise, hazardous travel and road closures are expected lateSunday into Monday. Strong winds and heavy, wet snow on trees and powerlines may damage trees and cause power outages. Also, there will be abroad area of light rain/freezing rain over parts of the Central Plainsinto the Upper Great Lakes.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. Further, with the high wind, critical fireweather conditions are forecast for Sunday over the Southern High Plains.On Monday, the front moves into the Lower Mississippi Valley, creatingshowers and severe thunderstorms. Therefore, the SPC has issued anEnhanced Risk (level 3/5) of severe thunderstorms over parts of the LowerMississippi Valley from Monday into Tuesday morning. The hazardsassociated with these thunderstorms are frequent lightning, severethunderstorm wind gusts, hail, and a few tornadoes. Additionally, there isan increased threat of EF2 to EF5 tornados over the area.In addition, the showers and thunderstorms will produce heavy rain overparts of the Central/Lower Mississippi and Tennessee Valleys. Therefore,the WPC has issued a Slight Risk (level 2/4) of excessive rainfall overparts of the Central/Lower Mississippi and Tennessee Valleys from Mondayinto Tuesday morning. The associated heavy rain will create mainlylocalized areas of flash flooding, with urban areas, roads, and smallstreams the most vulnerable.A surge of energy moving into the Northwest will aid in producingrain and higher-elevation snow over parts of Northern California on Mondayafternoon into late evening. The energy will also create coastal rain andhigher elevation snow over parts of the Pacific Northwest throughTuesday afternoon. Moreover, higher-elevation snow will continue from theNorthern Intermountain Region, Great Basin, Southwest, and SouthernRockies through Tuesday evening.