Croatian SIGMET in IWXXM 1.0
Current JSON

Abstract

The service provides the latest SIGMET reports in IWXXM for Croatian aerodromes in compliance with ICAO Annex 3, PANS-MET and EU Implementing Regulations.

The IWXXM data can be retrieved via:

  • Request/reply: OGC API - Environmental Data Retrieval (EDR) endpoint, where the IWXXM is provided as a ZIP archive
  • Subscription (publish/subscribe): AMQP 1.0, where the message contains the IWXXM as payload
Service Type
SWIM_COMPLIANT
Abbreviation
CCL
Life Cycle
OPERATIONAL
Business Activity Type
AERODROME_OPERATION
AIRSPACE_ORGANISATION_AND_MANAGEMENT
INFORMATION_MANAGEMENT
SERVICE_DELIVERY_MANAGEMENT
Intended Consumer
AIRPORT_OPERATOR
AIRSIDE_GROUND_HANDLER
CIVIL_AIR_NAVIGATION_SERVICE_PROVIDER
CIVIL_AIRSPACE_USER
COMMUNICATION_NAVIGATION_AND_SURVEILLANCE_SERVICE_PROVIDER
MILITARY_AIR_NAVIGATION_SERVICE_PROVIDER
MILITARY_AIRSPACE_USER
MILITARY_DEFENCE_CENTRE
NETWORK_MANAGER
PROVIDER_OF_DATA_SERVICES
REGULATED_METEOROLOGICAL_SERVICE_PROVIDER
Information Exchange Category
METEOROLOGICAL_INFORMATION_EXCHANGE
Application Message Exchange Pattern Entity
Request/Reply
FIR ICAO Location Indicator
LDZO
State ICAO Nationality Letters
RH
Geospatial Categorisation Description
The dataset is valid for Croatia (Zagreb FIR)
Other
Service Type: METEOROLOGICAL_FEATURE_ACCESS_SERVICE
In-Operation Date
30-Apr-2026
Provider
Croatia Control Ltd.

Croatia Control Ltd. is a company owned by the Republic of Croatia, which provides air navigation services.

We are certified for the provision of the following services and functions:

  • Air Traffic Services (ATS)
  • Communication, Navigation and Surveillance Services (CNS)
  • Aeronautical Information Services (AIS)
  • Aeronautical Meteorological Services (MET)
  • Flight Procedure Design Services (FPD)
  • Airspace Management (ASM)
  • Air Traffic Flow Management (ATFM).

We provide air navigation services openly and transparently, publish the conditions of access to our services via aeronautical information products as well as on our company website, and have implemented a procedure for regular formal consultations with our users. We do not discriminate against our users based on their nationality or identity or user category.

Provider Type
AIR_TRAFFIC_SERVICE_PROVIDER
Support

CCL is the aeronautical meteorological service provider for Zagreb FIR as designated by the Ministry of the Sea, Transport and Infrastructure of Croatia and certified by the Croatian Civil Aviation Agency.

Point of Contact
Operational Needs

This service contributes to fulfilling operational needs as defined in Commission Implementing Regulation (EU) 2017/373, ICAO Annex 3 and PANS-MET. It supports the EU Implementing Regulation 2021/116 - Common Project One.

Information Exchange Requirements

IER 1 - The information currently included in the SIGMET as defined in Commission Implementing Regulation (EU) 2017/373, ICAO Annex 3 Amendment 82, and PANS-MET.

Capabilities

The service provides high quality, up-to-date, trusted, regulated meteorological information in digital form for use by service consumers within the aviation domain.

Distribute Data

The service distributes the data according to the stored subscriptions and topics.

Request Data

The consumer can request data from the service using an OGC API - EDR endpoint.

Subscribe to Data

The user can subscribe to data via AMQP 1.0. Messages follow the SWIM TI Yellow Profile (Messaging).

Information Retainment

In accordance with ICAO ANNEX 3, meteorological information is retained for a period of at least 30 days from the date of issue.

Authentication and authorization

Access is limited by policy to users within the Aviation domain. Authentication is managed using SASL PLAIN for AMQP, and HTTP Basic for the EDR API. In the future, authentication and authorization via an EACP-issued Aviation Domain Certificate may be required to use the services.

Encryption

Communication is encrypted per the SWIM TI Yellow Profile.

Signature

The requested information may contain a digital signature using SHA-256 or stronger.

Time Behaviour

Under normal operations 95% of messages will be delivered within 5 minutes after the issuing time.

Capacity

Capacity of the services is monitored and can be reduced and/or revoked in case of overload of the system.

Integrity

The service ensures point-to-point integrity in accordance with EUROCONTROL Specification for SWIM Technical Infrastructure (TI) Yellow Profile through the use of Transport Layer Security (TLS).

However the Message Security based on S/MIME 4.0 proposed in SWIM TI Yellow Profile 2.0 is not yet implemented.

Confidentiality

Data delivery is only available for registered users, who need to present their credentials for access to the services using HTTP Basic for EDR connections, and using SASL plain for AMQP connections.

AIRM

ATM Information Reference Model

AMQP

Advanced Queueing Message Protocol (1.0) per SWIM TI Yellow Profile Messaging

ATC

Air Traffic Control

ATM

Air Traffic Management

CCL

Croatia Control Ltd.

EDR

Environmental Data Retrieval

HTTP

Hypertext Transfer Protocol

HTTPS

Hypertext Transfer Protocol Secure

ICAO

International Civil Aviation Organization

IER

Information Exchange Requirement

IR

Implementation Rules

ISRM

Information Service Reference Model

IWXXM

ICAO Meteorological Information Exchange Model

METAR

Meteorological Aerodrome Report

METP

Meteorological Provider

OGC

Open Geospatial Consortium

PCP

Pilot Common Project

SASL

Simple Authentication and Security Layer

SIGMET

Significant meteorological phenomena

TAF

Terminal Aerodrome Forecast

WMO

World Meteorological Organization

Information
SIGMET in IWXXM

A digital aeronautical meteorological warning for en-route aircraft concerning specified significant weather phenomena, encoded and exchanged using IWXXM.

https://airm.aero/developers/icao-wxxm-3.0.0-to-airm-1.0.0-index
Filtering Capabilities (EDR)

Filtering is exposed through OGC API - EDR query parameters and collections, including spatial, temporal, and parameter subsetting of IWXXM-derived attributes (e.g., aerodrome ICAO designator, validity period).

Filtering Capabilities (AMQP)

Simple filtering is achieved using the topic structure of the broker, which determines the type of data received. AMQP SQL-like syntax for filters applied to AMQP application properties can also be used by the service consumer to filter further the data received.

The service provider ensures that the data offered within this service is created by Croatia Control Ltd., a REGULATED_METEOROLOGICAL_SERVICE_PROVIDER.
Monitoring Description

For the AMQP subscriptions, regular heartbeat messages are sent to weather.aviation.metar topic at approximately 60-second intervals. Arrival of the heartbeat message indicates that the main subsystems of the service are running.

The CCL IT components are monitored by 24/7 maintenance

Typical Request/Reply Behaviour

The request is sent from the consumer to the EDR service, which processes the request and returns the requested IWXXM SIGMET message(s) as a zip archive.

Typical Data Subscription Behaviour

To subscribe to data, the consumer needs to contact the Service Provider and needs to request the credentials. After registration, the consumer is provided with the endpoints for both EDR and AMQP interfaces.

OGC EDR Request/Reply Interface

Allows the service consumer to request the latest available SIGMETs via OGC API - EDR.

PROVIDER_SIDE
SYNCHRONOUS_REQUEST_RESPONSE
Operations
CCL SWIM EDR API

Connection between the service provider and the consumer via OGC API - EDR. Contact [email protected] for credentials and details.

Url

Url will be available as per request.

IPV4_UNICAST

Service supports IPv4 unicast over TLS (mTLS per policy).

EDR Request
EDR Reply
AMQP Push Service

Allows the service provider to distribute the latest available SIGMETs, meeting the need of the service consumer that has subscribed for updates.

PROVIDER_SIDE
FIRE_AND_FORGET
Operations
AMQP Push Service

The IWXXM payload is delivered directly in the AMQP message or via reference to an EDR resource.

Idempotent
NON_IDEMPOTENT
Operation Message
AMQP Message
AMQP base endpoint

The base endpoint for AMQP subscriptions, from which AMQP messages may be retrieved.

Url

Url will be available as per request.

AMQP_MESSAGING

Binding aligned with EUROCONTROL SWIM Technical Infrastructure Yellow Profile (Messaging).

IPV4_UNICAST

Service supports IPv4 unicast over TLS (mTLS per policy).

AMQP Message
References
Revision Save Date
Thu, 06/11/2026 - 09:43
Schema version
v2