Additional hints:
•
The code tables for SYNOP and METAR are described in the 506-sided WMO document
number 306 (WMO-No.306 “Manual on Codes” Vol. I.1, 2010 edition)
•
The coding is done according the WMO guidelines in the precipitation type and the intensity
step (see the both following tables
Table 8
and
Tabelle 9
Example:
Sensor detects drizzle with 0.22mm/h intensity.
Output code:
Code table
Intensity step
Coding
SYNOP Tab.4677
Moderate
53
SYNOP Tab.4680
Moderate
52
METAR Tab.4678
Slight
-DZ
SYNOP intensities [mm/h]
Slight
Moderate
Heavy
Drizzle
≤
0,2
> 0,2 … 0,5
> 0,5
Rain, snow, unknown
precipitation, sleet, drizzle
with rain
≤
0,5
> 0,5 ... 4,0
> 4,0
Ice pellets, soft hail
≤
2,4
> 2,4 … 12,0
> 12,0
Hail (only Tab.4677)
Particle < 8mm
Particle
≥
8mm
Table 8: Intensity steps SYNOP
NWS/METAR/SPECI
intensities [mm/h]
[(inch/h)]
Slight Moderate Heavy
Drizzle
≤
0,25 (
≤
0,01)
> 0,25 … 0,5
> 0,5 (> 0,02)
Rain, precipitation, drizzle
with rain, sleet
≤
2,5 (
≤
0,1)
> 2,5 … 7,6
> 7,6 (> 0,3)
Snow ,soft hail, snow grains
Ice pellets
≤
1,25 (
≤
0,05)
> 1,25 … 2,5
> 2,5 (> 0,1)
Tabelle 9: Intensity steps METAR
50 - 66
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Summary of Contents for 5.4110 00 Series
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