SYNOP code (see http://weather.unisys.com/wxp/Appendices/Formats/SYNOP.html) has a field for describing cloud types by different levels, given as "8NCCC" (see link for further info, Cloud type information). And there is a program for converting SYNOP to XML, http://metaf2xml.sourceforge.net/, which in most cases seems to work. However, when the cloud code is "80000", which IMO is correct for a cloudless sky, then the program says "invalidFormat". So does anybody know if "80000" is correct or not?
"AAXX 11003 63658 32970 00905 10207 20060 38860 48492 80000 333 58002 555 10130"
Real life example showing that total cloud cover in previous section is also 0. Does this mean that when
total cloud cover = 0 is already given, then the section about cloud types is anyway meaningless?