This element allows for the use of a range in visibility values. MANAIR Appendix E.5. https://publications.gc.ca/site/eng/9.941904/publication.html Surface visibility lower value in the range. Surface visibility higher value in the range. This element allows for the use of a range in visibility values. MANAIR Appendix E.5. https://publications.gc.ca/site/eng/9.941904/publication.html Cloud base lower value in the range. Cloud base higher value in the range. The reference surface used for the value of the cloud base. For example, Mean Sea Level, Ground, standard pressure, etc.. This element allows for the use of a range in visibility values. MANAIR Appendix E.5. https://publications.gc.ca/site/eng/9.941904/publication.html Surface wind speed lower value in the range. Surface wind speed higher value in the range. This element allows for the use of a Canadian specific present/forecast weather code (IC).Reference: MANAIR 6.8.3.2 subsection 2). https://publications.gc.ca/site/eng/9.941904/publication.html A fall of non-branched ice crystals, in the form of needles, columns or plates, often so tiny that they seem to be suspended in the air. These crystals may fall from cloud or from a cloudless sky. The crystals are visible mainly when they glitter in the sunshine; they may then produce a luminous pillar or other halo. This hydrometeor, which is frequent in Polar Regions, occurs only at very low temperatures and in stable air masses. In WMO terminology, ice crystals are referred to as “diamond dust.” https://dd.meteo.gc.ca/today/aviation/iwxxm/code-ca/present_and_forecast_weather none