---
title: "MET.OR.250 SIGMET — SPECIFIC REQUIREMENTS FOR PROVIDERS OF METEOROLOGICAL SERVICES, ATM/ANS · Avioverse"
description: "A meteorological watch office shall: issue SIGMET; ensure that the SIGMET is cancelled when the phenomena are no longer occurring or are no longer…"
url: "https://avioverse.aero/regulations/easa/atm-ans/part-met/subpart-a/met-or-250"
---

# MET.OR.250 SIGMET

SPECIFIC REQUIREMENTS FOR PROVIDERS OF METEOROLOGICAL SERVICES · Regulation (EU) 2017/373 · EAR revision 12 Mar 2025

IR Implementing rule

## MET.OR.250 SIGMET

A meteorological watch office shall:

(a) issue SIGMET;

(b) ensure that the SIGMET is cancelled when the phenomena are no longer occurring or are no longer expected to occur in the area covered by the SIGMET;

(c) ensure that the period of validity of a SIGMET is not more than 4 hours, and in the special case of SIGMET for volcanic ash cloud and tropical cyclones, it shall be extended up to 6 hours;

(d) ensure that SIGMET are issued not more than 4 hours before the commencement of the period of validity. In the special case of SIGMET for volcanic ash cloud and tropical cyclones, SIGMET shall be issued as soon as practicable, but not more than 12 hours before the commencement of the period of validity, and updated at least every 6 hours.

IR · MET.OR.250 — Regulation (EU) 2017/373 · Regulation (EU) 2021/1338 · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

AMC Acceptable means of compliance

## AMC1 MET.OR.250(a) SIGMET

FIR AND CTA

Meteorological watch offices whose area of responsibility encompasses more than one FIR and/or CTA should provide separate SIGMET for each FIR and/or CTA.

AMC · AMC1 MET.OR.250(a) — Regulation (EU) 2017/373 · ED Decision 2020/008/R · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

AMC Acceptable means of compliance

## AMC2 MET.OR.250(a) SIGMET

DISSEMINATION OF SIGMET

SIGMET, and cancellations thereof, should be disseminated to international OPMET databanks and to centres responsible for the operation of aeronautical fixed service Internet-based services.

AMC · AMC2 MET.OR.250(a) — Regulation (EU) 2017/373 · ED Decision 2022/004/R · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

GM Guidance material

## GM1 MET.OR.250(a) SIGMET

DISSEMINATION OF SIGMET

Procedures for the dissemination of SIGMET to users are described in ICAO EUR Doc 018 ‘EUR OPMET DATA MANAGEMENT HANDBOOK’.

GM · GM1 MET.OR.250(a) — Regulation (EU) 2017/373 · ED Decision 2022/004/R · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

AMC Acceptable means of compliance

## AMC1 MET.OR.250(c) SIGMET

SOURCE

SIGMET concerning volcanic ash clouds and tropical cyclones should be based on advisory information provided by VAACs and tropical cyclone advisory centres (TCACs), respectively.

AMC · AMC1 MET.OR.250(c) — Regulation (EU) 2017/373 · ED Decision 2020/008/R · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

[All rules in SUBPART A — ADDITIONAL ORGANISATION REQUIREMENTS FOR PROVIDERS OF METEOROLOGICAL SERVICES (MET.OR)](https://avioverse.aero/regulations/easa/atm-ans/part-met/subpart-a)

Consolidated from the EASA Easy Access Rules (revision 12 Mar 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.