# Commission Implementing Regulation (EU) 2017/373 of 1 March 2017 laying down common requirements for providers of air traffic management/air navigation services and other air traffic management network functions and their oversight, repealing Regulation (EC) No 482/2008, Implementing Regulations (EU) No 1034/2011, (EU) No 1035/2011 and (EU) 2016/1377 and amending Regulation (EU) No 677/2011 (Text with EEA relevance), Division: MET.OR.120 Notification of discrepancies to the world area forecast centres (WAFCs)

Extent: E+W+S+N.I.

The meteorological services provider using WAFS SIGWX in binary universal form for the representation of meteorological data (BUFR) code form 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.

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Source: https://www.legislation.gov.uk/eur/2017/373/annex/V/division/1/division/section+1+general+requirements/division/5 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-373/annex-V/division-1/division-section+1+general+requirements/division-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.