In accordance with the working arrangements between WMO and ICAO, WMO governs and maintains the set of definitions and codes associated with routine exchange of meteorological information to support aviation operations.<br /></p><p><br /></p><p>This 'Aviation Meteorology' package defines physical properties and «CodeList» classes pertaining to the joint ICAO Annex 3 / WMO No. 49 Regulation - hence their inclusion in WMO METCE.<br /></p><p><br /></p><p>Often the entities defined herein are specialisations of generic meteorological entities.<br /></p><p><br /></p><p>[<font color="#ff0000"><i>Note the inconsistent use of "aviation" vs. "aeronautical"; please indicate preference</i></font>]<br /></p>