SIGMET / AIRMET (ICAO)#

Required roles: AIS PIB API — Roles
Base endpoint: https://ais-pib-api.ibosoft.net.tr:2087/opmet-decoder-sigmet-airmet
Reference documents: ICAO Doc 10157 PANS-MET, Ed. 1 (27/11/25) · ICAO Doc 8400 PANS-ABC, Ed. 9, Amend. 33 (8/11/18)
Attribution: show ibonav.aero or "Decoded by Ibosoft" wherever decoded output is displayed
Data sources: none — decodes the message supplied in the request.
Last updated: 17 OCT 2026

About the reference documents: Related Documents and Resources

Decodes SIGMET and AIRMET information into readable fields with one decoder, following the PANS-MET template strictly. Also returns the normalized message (corrected_raw) and the position of every decoded token (positions).

PANS-MET defines SIGMET and AIRMET in one template (Table A7-5), so one decoder serves both; the message type decides which elements and phenomena are allowed. To get messages to decode, see SIGMET / AIRMET.

Endpoints#

POST /opmet-decoder-sigmet-airmet/decode
Content-Type: application/json

{ "raw": "<SIGMET or AIRMET text>" }

Parameters#

How the template is processed#

• Field names and wording come from PANS-MET Table A7-5 and its notes: output keys are the template element names; phenomena, qualifiers and locations are expanded with the template's terms (e.g. SEV TURB → "Severe turbulence", STNR → "Stationary", S OF N2020 → "South of N20°20'"). Abbreviations are expanded as defined in PANS-MET and PANS-ABC (Doc 8400).
• Order: the message is read left to right in template order; the same pattern is told apart by its position — e.g. the first OBS/FCST after the phenomenon is Observed or forecast phenomenon, a later FCST AT nnnnZ is Forecast time (SIGMET only).
• M (mandatory) elements of the message type are always present (null when missing or not following the template). C (conditional) elements appear only when present. A cancellation (CNL SIGMET|AIRMET …) has no body elements.
• Type-specific content: a phenomenon that does not belong to the message type (e.g. SEV TURB in an AIRMET, ISOL CB in a SIGMET) is not accepted — Phenomenon is null and the group is undecodable. If the identification (SIGMET n / AIRMET n) is missing, only the elements common to both are decoded.
• Repeated elements (AND, e.g. several volcanic ash or tropical cyclone areas) are returned under Repetition of elements, one line per repeated group.
• Strict template: only the spellings of the template are accepted (e.g. a point written without a space, N2028W10949, is undecodable). Undecodable groups are listed under Undecodable elements; neighbouring ones form one entry.

For the full list of elements, phenomena and location forms, see PANS-MET Table A7-5.

Response#

Example — PANS-MET Example A7-11:

YUCC SIGMET 5 VALID 221215/221600 YUDO –
YUCC AMSWELL FIR SEV TURB OBS AT 1210Z N2020 W07005 FL250 INTSF FCST AT 1600Z S OF N2020 AND E OF W06950

{
  "Location indicator of FIR/CTA": "YUCC",
  "Identification": "SIGMET 5",
  "Validity period": "Valid from Day 22, 12:15 UTC to Day 22, 16:00 UTC",
  "Location indicator of MWO": "YUDO",
  "Name of the FIR/CTA": "YUCC AMSWELL FIR",
  "Phenomenon": "Severe turbulence",
  "Observed or forecast phenomenon": "Observed at 1210Z",
  "Location": "N20°20' W70°05'",
  "Level": "FL 250",
  "Changes in intensity": "Intensifying",
  "Forecast time": "Forecast at 1600Z",
  "Forecast position": "South of N20°20' and East of W69°50'",
  "positions": [{"start": 0, "end": 4}, "…"],
  "corrected_raw": "YUCC SIGMET 5 VALID 221215/221600 YUDO –\nYUCC AMSWELL FIR SEV TURB …",
  "raw": "YUCC SIGMET 5 VALID 221215/221600 YUDO – …"
}

Errors#