What weather condition is described by the term 'Sandstorm'?

The term 'Sandstorm' is commonly abbreviated as 'SS' in meteorological contexts. A sandstorm is a weather condition characterized by strong winds that lift and transport sand particles over a substantial distance, often leading to reduced visibility and difficult travel conditions. This phenomenon typically occurs in arid or semi-arid regions where loose, dry sand is available to be picked up by wind.

The other abbreviations correspond to different weather phenomena: 'SQ' denotes a squall, which is a sudden, sharp increase in wind speed. 'SN' represents snow, indicating weather that involves frozen precipitation. 'UP' is not a standard abbreviation used to describe specific weather events. Each of these terms signifies distinct meteorological conditions, making 'SS' the accurate designation for a sandstorm.