On 15 Jun, 09:17, wrote:
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.
I think the groups in (e) to (h) below have to be included each time
if radiation data are to follow. Your 69907 would be rainfall, not
radiation. It would be helpful to have Part B, to see regional
practice for the countries if interest.
FM 12 SYNOP, FM 13 SHIP, FM 14 SYNOP MOBIL
-
12.4.7.1.2 When the group 5j1j2j3j4 is used, one or more of the
following symbolic expressions shall
be adopted:
-
(a) 5EEEiE to report the daily amount of either evaporation or
evapotranspiration;
(b) 54g0sndT to report temperature change data in period covered by
W1W2;
(c) 55SSS to report the daily hours of sunshine;
(d) 553SS to report the duration of sunshine in the past hour;
(e) 55407 to indicate that the supplementary group 4FFFF, which
follows immediately,
is used to report net short-wave radiation during the previous hour,
in kJ m-2;
(f) 55408 to indicate that the supplementary group 4FFFF, which
follows immediately,
is used to report direct solar radiation during the previous hour, in
kJ m-2;
(g) 55507 to indicate that the supplementary group 5F24F24F24F24,
which follows
immediately, is used to report net short-wave radiation during the
preceding
24 hours, in J cm-2;
(h) 55508 to indicate that the supplementary group 5F24F24F24F24,
which follows
immediately, is used to report direct solar radiation during the
preceding
24 hours, in J cm-2;
Above extracted from this URL:
http://www.knmi.nl/%7Emeulenvd/wmo/m...l-I-1PartA.pdf
John