---
title: "MET.OR.120 Notification of discrepancies to the world area forecast centres (WAFCs) — SPECIFIC REQUIREMENTS FOR PROVIDERS OF METEOROLOGICAL SERVICES, ATM/ANS · Avioverse"
description: "The meteorological services provider using WAFS SIGWX forecasts shall notify the WAFC concerned immediately if significant discrepancies are detected or…"
url: "https://avioverse.aero/regulations/easa/atm-ans/part-met/subpart-a/met-or-120"
---

# MET.OR.120 Notification of discrepancies to the world area forecast centres (WAFCs)

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

IR Implementing rule

## MET.OR.120 Notification of discrepancies to the world area forecast centres (WAFCs)

The meteorological services provider using WAFS SIGWX forecasts shall notify the WAFC concerned immediately if significant discrepancies are detected or reported in respect of WAFS SIGWX forecasts concerning:

(a) icing, turbulence, cumulonimbus clouds that are obscured, frequent, embedded, or occurring at a squall line, and sandstorms or dust storms;

(b) volcanic eruptions or a release of radioactive materials into the atmosphere of significance to aircraft operations.

IR · MET.OR.120 — Regulation (EU) 2017/373 · Regulation (EU) 2021/1338 · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

GM Guidance material

## GM1 MET.OR.120 Notification of discrepancies to the world area forecast centres (WAFCs)

REPORTING — SIGNIFICANT DISCREPANCIES

Guidance on reporting significant discrepancies is provided in ICAO Doc 8896 'Manual of Aeronautical Meteorological Practice' as last amended.

GM · GM1 MET.OR.120 — 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.