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IMD SYNOP Code Generator

Generated SYNOP Telegram:

AAXX 07034 ...

Observation Header (Section 0)

Day (YY):

Hour UTC (GG): 0000 UTC 0300 UTC (Morning) 0600 UTC 0900 UTC 1200 UTC (Evening) 1500 UTC 1800 UTC 2100 UTC

Elev H (m):

⚠ Wind Unit (iw) [MANDATORY]: [Code 18] 4 - Speed in Knots (Anemometer) 3 - Speed in Knots (Estimated) 1 - Speed in m/s (Anemometer) 0 - Speed in m/s (Estimated)

Group 0 Code: 07034

Code 18: Wind Indicator (iw) Table

Code	Wind Velocity Measure	Unit
0	Estimated	Meters per second (m/s)
1	From Anemometer	Meters per second (m/s)
3	Estimated	Knots
4	From Anemometer	Knots

1. Pressure (SLP & MSLP)

Today's SLP (mb):

P0: 1004.3

Yesterday SLP (mb): For 24h P24 (58/59 group)

24h Diff (P24):

59022

MSL Pressure (mb): Manual

40160

2. Temperature & Hygrometry (Standard IMD Formula)

Dry Bulb (°C):

10294

Wet Bulb (°C):

WB: 25.8°C

Dew Point (°C):

20244

Relative Humidity (%):

RH: 74%

Vapour Pressure (mb):

e: 30.4 mb

03Z Min Read (Tn):

20234

03Z Min Setting:

Set: 23.4°C

12Z Max Read (Tx):

10385

12Z Min Read: Matches 03Z setting

3. Visibility & Wind

Visibility (Meters): [Code 25]

VV: 96

Lowest Cloud Base (h): [Code 14] 5 (600 - 999 m) 0 (0 - 49 m) 1 (50 - 99 m) 2 (100 - 199 m) 3 (200 - 299 m) 4 (300 - 599 m) 6 (1000 - 1499 m) 7 (1500 - 1999 m) 8 (2000 - 2500 m) 9 (No cloud < 2500 m) / (Obscured)

h: 5

Wind Speed (KMPH):

00 knots

Direction (dd):

Nddff: 20000

Code 25: Visibility (VV) Table

Code	Distance	Code	Distance
90	< 50 m	95	2,000 to 4,000 m
91	50 to 200 m	96	4,000 to 10,000 m
92	200 to 500 m	97	10 km to 20 km
93	500 to 1,000 m	98	20 km to 50 km
94	1,000 to 2,000 m	99	≥ 50 km

Code 14: Cloud Base Height (h)

Code	Height	Code	Height
0	0 to 49 m	5	600 to 999 m
1	50 to 99 m	6	1,000 to 1,499 m
2	100 to 199 m	7	1,500 to 1,999 m
3	200 to 299 m	8	2,000 to 2,500 m
4	300 to 599 m	9	> 2500 m or clear

4. Cloud Group (CL, CM, CH, N & Oktas)

Total Cover (N):

CL Code: [Code 4]

CL: 1

CL Okta (Nh):

Nh: 2

CM Code: [Code 5]

CM: 0

CH Code: [Code 3]

CH: 0

8-Group Clouds: 82100

Code 4: Low Clouds (CL)

Code	Specification
1	Cu humilis (ragged, flattened)
2	Cu congestus (moderate/strong vertical extent)
3	Cb calvus (summits lack sharp outlines)
4	Sc cumulogenitus
5	Sc (not formed from Cu)
9	Cb capillatus (with fibrous/anvil top)

Code 5: Medium Clouds (CM)

Code	Specification
1	Altostratus translucidus
2	Altostratus opacus or Nimbostratus
3	Altocumulus translucidus at single level
4	Altocumulus lenticularis (lens shaped)

Code 3: High Clouds (CH)

Code	Specification
1	Cirrus fibratus / uncinus
2	Dense Cirrus in patches (spissatus)
3	Dense Cirrus anvil remains of Cb

5. Weather Phenomena (7wwW1W2) & Timing Windows

Observational Time Windows for Selected Hour (0300 UTC):

1. Present Weather (ww): 02:50 to 03:00 UTC (10 mins ending at observation hour)

2. Preceding Weather (ww 20-29): 02:00 to 02:50 UTC (Preceding 50 mins of the hour)

3. Past Weather (W1, W2): 00:00 to 03:00 UTC (3 hrs) (Odd UTC: 3 hrs; Even UTC: 6 hrs)

Present Weather Code (ww): [Code 27]

Omitted (No Sig Weather)

Past Weather (W1 / W2): [Code 26]

Official ww Description (Decoded Live):

State of sky on the whole unchanged

Code 27: Present Weather (ww) Decades Table

Decade	Description
00-03	Cloud characteristic changes
04-09	Smoke, haze, or airborne dust
10-12	Mist or shallow fog
13-19	Thunderstorm (no rain), squall, or distant precip
20-29	Precipitation or fog during past hour, none now
40-49	Fog or ice fog at observation time
50-59	Drizzle
60-69	Rain (continuous or intermittent)
80-99	Showers or thunderstorm at station

Code 26: Past Weather (W1, W2) Table

Code	Phenomenon
0-2	Cloud cover variations
4	Fog, ice fog, or thick haze
5	Drizzle
6	Rain
8	Showers
9	Thunderstorm

6. Rainfall Measurement (6RRR/, 0R24, 1RT)

Rain since 03Z (mm or 'T'): [Code 23]

Coded Group: Omitted (Nil)

Rain nil → 6RRR/ omitted (iR=3)

24h Rain (mm) [03Z Only]:

Coded Group: Omitted

Omitted if nil / 0 mm

Progressive Seasonal (mm):

Coded Group: Omitted

Whole mm total (03Z Sec 5)

Code 23: Complete IMD Rainfall Coding Table (RRR)

Rainfall Range Measured	RRR Code	SYNOP Group	Reporting Specification
0.0 mm / Nil	Omitted	Omitted	Omitted in Sec 1 & 3; reported as iR=3[cite: 9, 27]
Trace (< 0.1 mm)	990	6990/	Precipitation occurred, but unmeasurable[cite: 31]
0.1 mm	991	6991/	Direct reading in tenths of mm[cite: 31]
0.2 mm to 0.8 mm	992 to 998	6992/ to 6998/	Direct reading in tenths of mm[cite: 31]
0.9 mm	999	6999/	Direct reading in tenths of mm[cite: 31]
1.0 to 1.5 mm	001	6001/	Rounded to 1 mm[cite: 31]
1.6 to 2.4 mm	002	6002/	Rounded to 2 mm[cite: 31]
2.5 to 3.5 mm	003	6003/	Rounded to 3 mm[cite: 31]
62.5 to 63.5 mm	063	6063/	Rounded to nearest whole mm[cite: 31]
988.5 mm or more	989	6989/	Maximum limit figure[cite: 31]

Special Cb Cloud Group (57 C Da ec - Section 3)[cite: 9]

C Cloud Form:

Direction (Da):

Elevation (ec):

Group 57 Code: 57972