A rare winter storm occurring later in the season is bringing snow and mixed winter weather to the Rocky Mountain regions this Memorial Day weekend, surprising many residents and travelers. The National Weather Service has issued warnings as a strong upper-level trough continues to drive cold air into the elevated areas of Colorado, Wyoming, and surrounding states. Travel through mountain passes is predicted to be treacherous, with certain locations expecting several inches of snowfall. Authorities are advising motorists to verify road conditions prior to venturing into the mountains for holiday weekend activities.