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भारत मौसम विज्ञान विभाग

मौसम विज्ञान केंद्र, अनिसाबाद पटना – 800002

🌐 mausam.imd.gov.in/patna

IMD SYNOP Creator

Surface Weather Observation Encoder · AAXX Format · IMD Code Book Compliant

Generated SYNOP Telegram

AAXX

SYNOP Analysis Report

Generating analysis...

Code Conversion Table

Parameter	Observation	Code	Group
Enter observation data...

Validation Report

Enter observation data to see validation...

IMD Station Database

State

District

Station Name

Index (WMO)

State	District	Station Name	Index	Elev (m)	Action

Showing 0 stations

Section 0 — Identification & Header

Station & Date/Time

Station Number (IIiii) *

Day GMT (YY) *

Hour GMT (GG) *

Indicators (iRixhVV)

Wind Indicator (iw) — Code 1

Precip Indicator (iR) — Code 17

Station Type/Wx (ix) — Code 19

Visibility & Cloud Base (hVV)

Visibility Input Mode

Visibility Value → auto VV (Code 25)

VV: //

Leave empty → VV = //

Lowest Cloud Base (h) — Code 14

Total Cloud & Wind (Nddff)

Total Cloud (N) — Code 20

Wind Direction

Select from 16-point compass

Wind Speed (ff)

≥100 → adds 50 to dd

Notes on Section 0

🕒 YY/GG must be in UTC/GMT — never IST directly.
💨 Calm wind: Select "Calm" mode for dd=00 ff=00.
🌀 Variable wind: Select "Variable" for dd=99.
👁️ Visibility input auto-converts to WMO Code 25.
☁️ N=8: Sky completely covered. Use 7 for overcast with gaps.

Section 1 — International Exchange Data

Temperature (1snTTT, 2snTdTdTd)

Dry Bulb Temperature T (°C)

+ve/0→sn=0, −ve→sn=1. Ex: −5.7→11057

Dew Point Td (°C)

Pressure (3P₀P₀P₀P₀, 4PPPP, 5appp)

Station Level Pressure (hPa)

Encodes to 3PPPP (thousands digit omitted)

MSL Pressure (hPa)

Encodes to 4PPPP (For elevation < 800m)

3hr Tendency (a) — Code 10

3hr Change (hPa) ppp

Weather & Precipitation

Present Weather (ww) — Code 27

Highest applicable code. Omitted if ix=2,3,5,6

Past Weather W1 — Code 26

Past Weather W2

Cloud Details (8NhCLCMCH)

Nh — Low cloud amount

CL — Low cloud type

CM — Medium cloud type

CH — High cloud type

8NhCLCMCH omitted when N=0, N=9, or N=/

Section 3 — Regional (333) Special Groups

Max/Min Temp

Max Temperature Tx (°C) → 1snTxTxTx

Min Temperature Tn (°C) → 2snTnTnTn

24hr Pressure Change (58/59 P24P24P24)

24hr Pressure Change (hPa)

+ve→58, −ve→59. Encodes in tenths of hPa.

Precipitation (6RRRtR)

Precipitation Amount (mm) — RRR

RRR: ///

Trace (RRR=990). Leave amount empty if Trace.

Precip Duration tR — India = /

Cloud Movement (56DLDMDH)

DL (Low)

DM (Mid)

DH (High)

56DLDMDH omitted if all are '/'

Orographic/Vertical Cloud (57CDaec)

Auto-derived from CL/CM above. No qualifying cloud (CL=2, CL=3/9, or CM=4) currently selected — group omitted.

Individual Cloud Layers (8NsChshs)

Cloud-height instrument available

Only Pilot Balloon / theodolite-equipped observatories report this group. Max 4 layers, ordered low→high. Omit a layer if Ns=0 or Ns=9.

Squall Reporting

Squall Occurred

Sudden wind increase by ≥3 Beaufort stages to Force 6+, lasting ≥1 min.

Manned Observatory (9-groups)

Start Time (IST)

Duration (Auto)

End Time (IST)

Max Speed (knots)

Direction (Dq)

Nature (q)

Preview: --

Wind Direction (Dq)

N E S W NE SE SW NW

Section 5 — National (555) IMD Groups

24hr Rainfall (0R24R24R24R24)

24hr Total Rainfall (mm) — 03 UTC only

////

Trace 24hr rainfall (R24=9999)

Group 0R24R24R24R24 — only at 03 UTC observation

Seasonal Rainfall (1RTRTRTRT)

Seasonal Accumulated Rainfall (mm) — 03 UTC only