On 15 Jun., 20:49, wrote:
I think the groups in (e) to (h) below have to be included each time
if radiation data are to follow.
....
Hi John,
thanks for the info. The ambiguous part I mean is related to

(c) 55SSS to report the daily hours of sunshine;
(d) 553SS to report the duration of sunshine in the past hour;

In section 12.4.7.4.3 it says:
"When the group 5j1j2j3j4 has the form 553SS, the supplementary
group(s) j5FFFF may take one or more of the following forms:
j5 = 0 FFFF = positive net radiation during the previous hour, in kJ m-
2;
j5 = 1 FFFF = negative net radiation during the previous hour, in kJ m-
2;
j5 = 2 FFFF = global solar radiation during the previous hour, in kJ m-
2;
j5 = 3 FFFF = diffused solar radiation during the previous hour, in kJ
m-2;
j5 = 4 FFFF = downward long-wave radiation during the previous hour,
in kJ m-2;
j5 = 5 FFFF = upward long-wave radiation during the previous hour, in
kJ m-2;
j5 = 6 FFFF = short-wave radiation during the previous hour, in kJ m-
2."

To me (I'm not a native English speaker) it sounds like there can be 1
to 7 groups after 553SS, starting with 0 to 6. In 12.4.7.4.4, they
mention similar groups to follow 55SSS. If a radiation group starting
with 6 may follow, and also the precipitation group starting with 6,
how can the two cases be distinguished? 554xx and 555xx seem to be
used for just two other kinds of radiation; I could find no relation
to 55SSS and 553SS. Am I missing something here?

t would be helpful to have Part B, to see regional practice for the countries if interest.

Part B for Region VI (Europe) says only:
"These groups" (in section 3) "shall be used in accordance with
Regulation 12.4.7 of Volume I.1 of the Manual on Codes." and at what
time those groups should be included. Some national parts also just
mention the period for which it is valid and the reporting times.