Sandstorm, Dust Storm or Blowing Snow
This phenomenon occurs in desert environments where the top layer of soil is loose or sandy, or in a cold environment where the ground is covered by a thick, loose layer of snow. Regardless of what the result that the appropriate precipitation table indicates, nno precipitation will fall on the day that a sandstorm occurs; instead, the very strong winds will pick up the loose soil (or snow), and for a period of 2-5 hours (1D4+1) the rapidly moving air will be filled with particles that inhibit movement and reduce visibility, and may even cause damage to unprotected characters or creatures. A severe sandstorm occurs whenever gale-force winds are indicated for a desert environment, or an arctic or subarctic environment where snow is on the ground. This condition will last for 2-7 hours (1D6+1), and only the very hardy or very foolish will attempt to do anything other than seek shelter and wait out the storm.