WMO Solid Precipitation Intercomparison Experiment (SPICE)

WMO-Sponsored Solid Precipitation Intercomparison Experiment (SPICE)

Measurement of wintertime precipitation, both in solid and mixed precipitation phases, presents significant challenges to precipitation measurement instrumentation and can lead to large errors or uncertainties in precipitation estimates. Previously, the most recent comprehensive study, the “WMO Solid Precipitation Measurement Intercomparison” concluded in 1998 and focused on manual techniques of solid precipitation measurement. To address this need, the World Meteorological Organization (WMO) initiated the Solid Precipitation Intercomparison Experiment (SPICE) in 2012 and is currently in its final analysis phase.  This experiment involved the participation of 15 snow measurement sites around the world. Each site was outfitted with a variety of automated snow measurement devices to test.  The NCAR Marshall field site was one of the sites and included testing of over 50 automated instruments.  NCAR RAL co-lead this effort with collaborators from around the world.  This project is described in more detail in the Winter Weather section of this report.