Heavy mountain snow expands across Four Corners and Southern Rockiesthis weekend.Severe Thunderstorm and Excessive Rainfall chances shift south into theSoutheast and Gulf Coast States.Mild weather continues across the Pacific Northwest and East Coast.A closed upper low will continue spinning over the Southwest this weekend,while an upper ridge builds over the Northwest and a deep trough descendsinto the Great Lakes/Midwest. Shortwave energy will round the base of theclosed low in the Southwes...