Table AIV-9.—WMO CODE 4019
WMO CODE 4019
tR - Duration of reference period for the amount of precipitation ending at
the time of the report.
Code
Period preceeding observation
1
6 hours
2
12 hours
3
18 hours
4
24 hours
5
1 hour
6
2 hours
7
3 hours
8
9 hours
9
15 hours
Table AIV-10.—WMO CODE 1819
WMO CODE 1819
iR - Indicator for inclusion or ommission of precipitation data.
Code
0
1
2
3
4
Data group 6RRRtR is:
Included in section 1 & 3.
Included in section 1.
Included in section 3.
Omitted - Precipitation amount = 0).
Omitted - Measurement not available.
Table AIV-11.—WMO CODE 1855
WMO CODE 1855
iw - Indicator for source and units of wind speed.
Code
Source
Units
0
Estimated.
Meters per second.
1
From anemometer.
3
Estimated.
Knots.
4
From anemometer.
AIV-15
