Major Winter Storm through Tuesday over the Central Plains into theUpper Mississippi Valley...The major winter storm continues through Tuesday over the Central Plainsinto the Upper Mississippi Valley. Snow and strong winds will continuefrom the Central Plains to northern Minnesota through Monday night, alongwith sleet and freezing rain in parts of the Upper Mississippi Valley.In addition, hazardous impacts will be snow, icing, and wind. Blowing andfalling snow will significantly reduce visibility, and blizzard conditionswill persist into Tuesday across portions of the Plains and northernMinnesota. Travel may be very difficult or impossible at times. Poweroutages and tree damage are possible in some areas due to heavy snow,icing, and strong winds. Also, plan on slippery roads.Meanwhile, the front associated with the storm extends from the MiddleMississippi Valley/Southern Plains and moves eastward to the lower GreatLakes into the Central Gulf Coast by Wednesday evening.The system will create showers and severe thunderstorms over the LowerMississippi Valley. Therefore, the SPC has issued an Enhanced Risk (level3/5) of severe thunderstorms over parts of the Lower Mississippi Valleythrough Tuesday morning. The hazards associated with these thunderstormsare frequent lightning, severe thunderstorm wind gusts, hail, and a fewtornadoes. Additionally, there is an increased threat of EF2 to EF5tornados over the area.In addition, the showers and thunderstorms will produce heavy rain overparts of the Middle/Lower Mississippi and Tennessee Valleys. Therefore,the WPC has issued a Slight Risk (level 2/4) of excessive rainfall overparts of the Middle/Lower Mississippi and Tennessee Valleys throughTuesday morning. The associated heavy rain will create mainly localizedareas of flash flooding, with urban areas, roads, and small streams themost vulnerable.By Tuesday, the threat of severe thunderstorms decreases slightly to aMarginal Risk over parts of the Great Lakes/Ohio Valley, with a SlightRisk of severe thunderstorms over parts of the Central Gulf Coast.Therefore, the SPC has issued a Slight Risk (level 2/5) of severethunderstorms over parts of the Central Gulf Coast from Tuesday throughWednesday morning. The hazards associated with these thunderstorms arefrequent lightning, severe thunderstorm wind gusts, a few tornadoes, and aminimal threat of hail.Similarly, the showers and thunderstorms will create heavy rain over partsof the Central/Eastern Gulf Coast. Therefore, the WPC has issued a SlightRisk (level 2/4) of excessive rainfall over parts of the Central/EasternGulf Coast on Tuesday through Wednesday morning. The associated heavy rainwill create mainly localized areas of flash flooding, with urban areas,roads, and small streams the most vulnerable.On Wednesday, the threat of severe thunderstorms ends. However, the threatof excessive rainfall continues over parts of the Eastern Gulf Coast andSoutheast. Therefore, the WPC has issued a Slight Risk (level 2/4) ofexcessive rainfall over parts of the Eastern Gulf Coast and Southeast onWednesday. The associated heavy rain will create mainly localized areas offlash flooding, with urban areas, roads, and small streams the mostvulnerable.Elsewhere, from Tuesday evening into Wednesday, moisture from the Atlanticwill move onshore over New England, bringing warmer temperatures andtrapping cold air in the interior of Northern New England. The warm, moistair will create rain/freezing rain over parts of Northern New England fromTuesday evening into Wednesday.