A heavy snow warning has been issued for parts of Arizona, with forecasts predicting up to 18 inches of snow in certain areas. The National Weather Service has described the warning as 'hazardous', indicating significant snowfall that could severely impact travel and daily activities across the region. According to Newsweek, the snow is expected to begin accumulating rapidly, creating challenging conditions for both residents and travelers. This substantial snowfall is part of a larger weather system affecting the southwestern United States.