Hi,

the WMO 306 Manual on Codes (2001) says that after a sunshine group in
the regional part of a SYNOP there can be groups with radiation
information if available. Those groups can start with 0..6 for the
different radiation types (0 = positive net rad., 1 = negative net
rad., ... 5 = upward long-wave rad., 6 = short-wave rad.).

But how can they be distinguished from another "regular" 5xxxx or
6xxxx (precipitation) group? E.g. in this SYNOP from yesterday:

AAXX 13031 10430 26520 /1601 10158 20141 39900 40086 58007 87/// 333
55300 69907 83/30 84/42 87/47

is "69907" precipitation (I think it is) or short-wave radiation?

Thanks for any help.