D5 - This really is the meaning when Q uses "D5" - Look at drop 1332 and 2096 On https://qmap.pub/ you can search for all drops mentioning 'D5'. The context is really clear in drop #1332   and was repeated in  drop #2096: The snowball has begun rolling - there is no stopping it now. D5. For drop #1401 qmap.pub added the header: God Bless the USA (D5 = Avalanche) And here's the definition:  US Avalanche Rating Codes