APPENDIX IV
WMO CODE TABLES
This appendix contains graphic or tabular representations of many of the code
tables referenced in this training manual. The wording of the code tables has been
simplified in some cases to clarify the meaning.
WMO CODE TABLE
APPENDIX PAGE
0200 - (a) Pressure tendency . . . . . . . . . . . . . . . . . . .
AIV-3
0264 - (a3) Standard isobaric surface . . . . . . . . . . . . . . .
AIV-18
0265 - (a4) Type of equipment used . . . . . . . . . . . . . . . .
AIV-18
0439 - (bi) Ice of land origin . . . . . . . . . . . . . . . . . . .
AIV-17
0500 - (C) Genus of cloud. . . . . . . . . . . . . . . . . . . . .
AIV-3
0509 - (CH) High cloud reporting codes . . . . . . . . . . . . . .
AIV-3, 8, 9
0513 - (CL) Low cloud reporting codes . . . . . . . . . . . . . .
AIV-3, 4, 5
0515 - (CM) Mid cloud reporting codes. . . . . . . . . . . . . . .
AIV-3, 6, 7
0639 - (ci) Concentration or arrangement of sea ice . . . . . . .
AIV-16
0700 - (DS) Direction or bearing in one figure . . . . . . . . . . .
AIV-10
0739 - (Di) True bearing of principle ice edge . . . . . . . . . . .
AIV-17
0822 - (dT) Amount of temperature change . . . . . . . . . . . .
AIV-14
0901 - (E) State of the ground without snow or ice . . . . . . . .
AIV-11
0975 - (E') State of the ground with snow or ice . . . . . . . . . .
AIV-10
1600 - (h) Height above surface of base of lowest cloud . . . . .
AIV-11
1677 - (hShS or htht) Height in two figures . . . . . . . . . . . . .
AIV-12
1690 - (hShShS) Height or altitude in three figures . . . . . . . . .
AIV-13
1734 - (Id) Indicator, hundreds or tens value (hPa) . . . . . . . .
AIV-19
1751 - (IS) Ice accretion on ships . . . . . . . . . . . . . . . . . .
AIV-16
1819 - (iR) Indicator, inclusion or omission of precip data. . . . .
AIV-14
1855 - (iW) Indicator, source and units of wind speed . . . . . . .
AIV-14
1860 - (iX) Indicator, type of station . . . . . . . . . . . . . . . .
AIV-14
2590 - (MMM) Marsden square number . . . . . . . . . . . . . .
AIV-20
2700 - (N) Total cloud cover . . . . . . . . . . . . . . . . . . . .
AIV-3, 13
3333 - (QC) Quadrant of the globe. . . . . . . . . . . . . . . . . .
AIV-19
3551 - (RS) Rate of ice accretion on ships. . . . . . . . . . . . . .
AIV-16
3739 - (Si) Stage of sea ice development. . . . . . . . . . . . . .
AIV-18
3850 - (SS) Sign and type of measurement for SST . . . . . . . .
AIV-19
AIV-1
