.Heavy snow over parts of Central Rockies Wednesday night into Thursdayand the Mogollon Rim and the San Juans Thursday night into Friday......There is an Enhanced Risk of severe thunderstorms over the Plains andMississippi Valley from Wednesday to Thursday......There is a Slight Risk of excessive rainfall over parts of theCentral/Southern Plains and Middle/Lower Mississippi Valley on Wednesdayand Thursday, extending into Southeast and Tennessee Valley on Friday...A wave of low pressure along a front over Central Plains movesnortheastward to the Northeast by Friday. The storm will create asignificant and long-duration winter storm across the Central and SouthernRockies beginning Wednesday, followed by a round of heavy snow for theSouthern Rockies and Four Corners region Thursday night. The winter stormwill spread heavy snow Wednesday night across the Central Rockies throughFriday, with snow expanding into the Southern Rockies beginning Thursday.A second round of heavy snow will develop over the Four Corners lateThursday and persist into the weekend.Heavy snow across the Central/Southern Rockies will become heavy Wednesdaynight across the Central Rockies with snowfall rates exceeding 2 inchesper hour possible (40-60%) in the Front Range Wednesday evening andThursday. The snowfall rates are expected (greater than 90%) to producemore than 1 foot of snow across much of the Front Range, Foothills, Sangrede Cristos, and San Juans. Locally, 2-4 feet of snow are possible(20-30%).The storm will significantly impact travel. The combination of heavysnowfall rates and wind gusts exceeding 35 mph will cause blowing snow andseverely restricted visibility, especially along the I-25 urban corridorand other mountain roads in the region. Travel will be difficult toimpossible. Expect road closures. Disruptions to infrastructure due topower outages are also possible.A second phase of the winter storm will impact the Four Corners Regionbeginning Thursday night. Waves of heavy snow will affect the terrainareas north of the Mogollon Rim and northeastward toward the San Juans andsouthern Colorado Rockies. Snow probabilities for 8 inches are moderate tohigh (greater than 50%). Localized totals above a foot are possible forthe higher terrain. Moreover, rain will develop over the lower elevationsof the Southwest and Southern Rockies.Furthermore, overnight Wednesday, showers and severe thunderstorms willexpand along the front from the Central Plains/Middle Mississippi Valley.Therefore, the SPC has issued an Enhanced Risk (level 3/5) of severethunderstorms over the Central Plains/Middle Mississippi Valley throughThursday morning. The hazards associated with these thunderstorms arefrequent lightning, severe thunderstorm wind gusts, hail, and a fewtornadoes. Additionally, there is an increased threat of hail two inchesor greater over parts of the area.In addition, the showers and thunderstorms will create heavy rain over theCentral Plains/Middle Mississippi Valley. Therefore, the WPC has issued aSlight Risk (level 2/4) of excessive rainfall over parts of the CentralPlains/Middle Mississippi Valley through Thursday morning. The associatedheavy rain will create mainly localized areas of flash flooding, withurban areas, roads, and small streams the most vulnerable.On Thursday, the showers and severe thunderstorms move south and eastwardinto the Southern Plains/Lower Mississippi Valley. Therefore, the SPC hasissued an Enhanced Risk (level 3/5) of severe thunderstorms over theSouthern Plains and Middle/Lower Mississippi Valley from Thursday intoFriday morning.