SYNOP Encoder
Synoptic Weather Data Entry & Report Generator
--:--:-- UTC
Basic Information
Observation Time
*
— select —
2 (0600Z observation)
8 (1200Z observation)
Determines report format & special groups
Station Number (III)
*
3 digits — prefixed with block 67
Day of Month (YY)
*
Weather Measurements
First Cup Anemometer Reading
*
Second Cup Anemometer Reading
*
Wind force ff derived from the difference
Cloud Base Height (h)
*
Visibility (VV)
*
Total Cloud Cover (N, octas)
*
Wind Direction (dd)
*
Dry Bulb Temperature (°C)
*
Wet Bulb Temperature (°C)
*
Pressure PPPP (4 digits)
*
24h-ago Pressure (for tendency)
Used for the 5appp 24-hour change group
Rainfall Data
Rainfall Option
1 — Rainfall available
2 — Trace
3 — Omission (no precipitation group)
Rainfall Amount (mm)
Present Weather
Weather Option
1 — Present weather available
2 — No weather to report
Weather Code (wwW₁W₂, 4 digits)
Cloud Information (8-group)
Cloud Option
1 — Low/medium cloud available
2 — No low/medium cloud
Low Cloud Amount Nh (octas)
Low Clouds Code (C
L
)
Medium Clouds Code (C
M
)
High Clouds Code (C
H
)
Extra Cloud Groups (333 section)
Number of Layers (0–4)
0
1
2
3
4
Additional / 08:00 Specials
Max Temperature (°C)
*
Min Temperature (°C)
*
Past 24h Weather (W₁W₂)
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Report Output
SYNOPTIC CODE
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