Heavy lake-effect snow over parts of the western U.P. of Michigan andlake-effect snow downwind from the Great Lakes; moderate to heavy snowover the Southern Rockies.There is a Slight Risk of excessive rainfall over parts of the SouthernPlains and Western/Central Gulf Coast.There is a Slight Risk of severe thunderstorms over parts of southernTexas.A front extending from the Great Lakes to the Central Plains will move offthe Northeast Coast by Sunday evening. In the wake of the front,upper-level energy moves across the Great Lakes and the Northeast throughMonday evening. The upper-level energy will create lake-effect snowdownwind from the Great Lakes. The heaviest lake-effect snow will be overthe western portion of the U.P. of Michigan from Saturday evening intoSunday evening. A second area of heavy lake-effect snow will developdownwind from Lake Ontario Sunday night into Monday. In addition, snowwill develop over parts of the Central Appalachians and the higherelevations of the Northeast, likewise, from Sunday evening into Monday.Moreover, an upper-level low over the Four Corners Region will producemoderate to heavy snow over parts of the Central/Southern Rockies throughSunday evening. The energy will also create snow and lower-elevation rainover parts of the Great Basin, Southwest, and Southern Rockies throughMonday.Meanwhile, a second front extending from the Southeast to southern Texaswill move off the Gulf Coast on Monday. With favorable upper-level flow,showers and severe thunderstorms develop over parts of southern Texas.Therefore, the SPC has issued a Slight Risk (level 2/5) of severethunderstorms over parts of southern Texas through Sunday morning.The hazards associated with these thunderstorms are frequent lightning,severe thunderstorm wind gusts, hail, and a few tornadoes. Further, thereis an increased threat of hail, two inches or greater, over South-CentralTexas.Furthermore, the showers and thunderstorms will also have heavy rain overparts of the Southern Plains/Western Gulf Coast. Therefore, the WPC hasissued a Slight Risk (level 2/4) of excessive rainfall over parts of theSouthern Plains/Western Gulf Coast through Sunday morning. The associatedheavy rain will create mainly localized areas of flash flooding, withurban areas, roads, and small streams the most vulnerable.On Sunday, the severe thunderstorm threat decreases slightly to a MarginalRisk (level 1/5) along the Western/Central Gulf Coast through Mondaymorning. Moreover, the showers and thunderstorms will produce heavy rainover the Central Gulf Coast. Therefore, the WPC has issued a Slight Risk(level 2/4) of excessive rainfall over parts of the Central Gulf Coastfrom Sunday into Monday morning. The associated heavy rain will createmainly localized areas of flash flooding, with urban areas, roads, andsmall streams the most vulnerable. The threat of excessive rainfall endsby Monday. However, showers and thunderstorms will develop over parts ofFlorida through Monday evening.