Graupel (also called snow pellets) refers to precipitation that forms when supercooled droplets of water condense on a snowflake, forming a 2–5 mm ball of rime ice; the snowflake acts as a nucleus of condensation in this process. The term is derived from [LINK: http://de.wiktionary.org/wiki/Graupel] German "Graupel" meaning the same. Graupel does not include other frozen precipitation such as snow or diamond dust. The METAR code for graupel is GS.[LINK: http://www.met.tamu.edu/class/METAR/metar-pg9-ww.html] AVIATION ROUTING WEATHER REPORT, Present Weather Group. Department of Atmospheric Sciences, Texas A&M University.[LINK: http://www.nws.noaa.gov/asos/icepell.htm] USA and International Code Change For Ice Pellets. Automated Surface Observing System, National Weather Service. on both ends of a columnar snow

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