The IWXXM SIGMET Subscription and Request Service provides the service consumer with SIGMETs for weather that may affect the safety of aircraft operations.

The service consumer can subscribe to the service, specifying the airspaces that are of interest, and receive information as it becomes available.

It is also possible to send a direct request, using a request-reply mechanism, to the service to get the relevant meteorological information.

The meteorological information is issued by the designated Meteorological Watch Office. The meteorological information is only intended to be used by service consumers within the aviation domain.

There shall be a service policy to ensure that only service consumers within the aviation domain can use the service.

The service policy shall include a requirement that service consumers cannot pass the information obtained from the service to non-aviation users without prior authorisation from the service provider.

The service shall ensure consumer authentication in accordance with EUROCONTROL Specification for SWIM Technical Infrastructure (TI) Yellow Profile requirement SWIM-TIYP-0042.

The service shall ensure provider authentication in accordance with EUROCONTROL Specification for SWIM Technical Infrastructure (TI) Yellow Profile requirement SWIM-TIYP-0042.

The service shall ensure that satisfactory authorisation is put in place according to EUROCONTROL Specification for SWIM Technical Infrastructure (TI) Yellow Profile requirement SWIM-TIYP-0070.

The meteorological information offered by the service shall be verified by the service provider.

The meteorological information offered by the service shall be encoded according to the rules of the IWXXM standard.

• PUBLISH_SUBSCRIBE
• SYNCHRONOUS_REQUEST_REPLY

IWXXM SIGMET Subscription and Request Service Request Interface

Allows the service consumer to select and subscribe to SIGMETS for airspaces that are of interest. It allows the service consumer to manage the subscriptions e.g. to unsubscribe.

Note: This is an optional interface. Many service providers will prefer to receive subscription requests by email.

The service shall offer meteorological information in accordance with ICAO Annex 3.

The service shall offer meteorological information in accordance with the rules of latest applicable version of IWXXM.

Note: the latest applicable version of IWXXM (IWXXM 2023-1) contains the SIGMET schema version 4.0.1.

The object of the meteorological service outlined in Annex 3 is to contribute to the safety, efficiency and regularity of air navigation. This is achieved by providing necessary meteorological information to operators, flight crew members, air traffic services units, search and rescue units, airport management and others concerned with aviation. Close liaison is essential between those supplying meteorological information and those using it.

• https://www.ogc.org/standard/ogcapi-edr/
• https://docs.ogc.org/is/19-086r6/19-086r6.html 

WFS offers direct fine-grained access to geographic information at the feature and feature property level. 

Note: This is equivalent to ISO 19142 - Geographic Information - Web Feature Service.

This jointly developed OGC and ISO TC/211 International Standard describes an XML and KVP encoding of a system neutral syntax for expressing projections, selection and sorting clauses collectively called a query expression. These components are modular and intended to be used together or individually by other standards which reference this International Standard.

Note: This is equivalent to ISO 19143 - Geographic Information - Filter encoding.

• Generate graphical representations of data in support of responsibilities.
• Ensure safe operations by responding to changes in the situation.
• Provide in-flight information updates.
• Support the operations of search and rescue
• Require information on unique weather constraints such as turbulence, convection, icing, etc..

• Generate graphical representations of data in support of responsibilities.
• Ensure safe operations by responding to changes in the situation.
• Provide in-flight information updates.
• Support the operations of search and rescue
• Require information on unique weather constraints such as turbulence, convection, icing, etc..

• Ensure safe operations by responding to changes in the conditions of the airspace infrastructure.
• Require information on unique weather constraints such as turbulence, convection, icing, etc..

This role is recognised in the SESAR Deployment Programme as a service consumer of the aerodrome and en-route services.

The real-time aspects will have an impact on the service architecture.

• Ensure safe operations by responding to changes in the conditions of the airspace infrastructure.
• Require information on unique weather constraints such as turbulence, convection, icing, etc..

• Support situational awareness of ACC units regarding observed and/or forecasted significant weather
• Support capacity planning for APP and TWR units to increase separation due to expected e.g. thunderstorms, strong winds, low visibility,…

• MET providers shall have the possibility and ability to consume needed information to perform their tasks e.g. flight briefing or to update their forecast products based on the latest weather information

This role is not recognised by the SESAR Deployment Program as a service consumer. However, it is recognised in ATM Master Plan (https://atmmasterplan.eu/data/enablers/20417016.)

Moreover, looking at the EU Reg. 2017/373, a MET Service Provider has to support stakeholders and for that MET-data is needed from other MET-providers. Also such MET-data is needed for their own purpose to evaluate the correctness of forecasts.

• Not applicable

• Not applicable

• In case a provider of data services also offers/handles MET data, the provider shall have the possibility and ability to receive the data needed

• MET providers shall provide dedicated forecast product(s) to the NM in order to support daily operations. Mainly this forecast is used for pre-planning the next day, raising awareness of the NM on any possible restrictions/slotting due to hazardous weather

• Not applicable. Currently there are special products for local warnings. Partly via the MET-Report, but also via dedicated warning messages (strong winds, temperatures below 0°, thunderstorms,….).

• Provide information to ground handlers especially in regard to hazardous weather which might affect their operations (thunderstorms, freezing rain,..)

A military defence centre.

Note: these centres, e.g., check for diplomatic clearance.

• Not applicable