Meteorological Collaborative Decision Making (MET CDM) is the process of considering aviation-related weather criteria contained in weather forecasts to assess the potential impact on the arrival rates used in Air Traffic Flow Management (ATFM). This process aims to optimise runway capacity by closing the gap between planned and actual arrival rates which will provide for greater predictability for daily operational planning by airlines.

The current focus for the MET CDM Program is in the Terminal Movement Area during the pre-tactical timeframe, specifically the day before operations at airports where a Ground Delay Program (GDP) is run. A trial starts in Sydney on Friday 30 September 2016 which is due to be completed in February 2017. Provided it is successful, the process will be transitioned to business as usual.

Why are we doing MET CDM and what is changing?

Current GDP rates are determined by weather products that were not designed to support ATFM, for example, the Terminal Area Forecast (TAF). By enhancing the forecast information considered during pre-tactical planning, it is anticipated that the gap between planned and actual arrival rates can be reduced.

Therefore, the MET CDM process includes considering weather information from the TAF plus other products and expertise including NCCMET, Regional Area Forecasters and AVMET. The final MET CDM product is produced after consulting with the CDM staff and Terminal Area Coordinator (TAC)/Traffic Manager (TM) to ensure arrival rates that best suit the enhanced forecast are used in the GDP.

MET CDM has been identified as a priority by airlines, and also forms part of the ICAO Global Air Navigation Plan.

What are the benefits of MET CDM?

The benefits of MET CDM include the following:

• Using enhanced weather forecast information to determine pre-tactical arrival rates that will better suit the weather conditions on the day. This is expected to result in fewer GDP re-runs

• Greater predictability between planned arrival rates the day before operations and the actual arrival rates on the day, which will provide a better basis for planning the day’s operations

Collaboration between meteorological experts across stakeholders will build understanding and consensus on the aviation implications of forecasting.

• The process and business rules will allow more flexibility and responsiveness in regards to setting arrival rates to maximise runway throughput in consideration of weather constraints.

What is the plan for MET CDM?

MET CDM is being trialled operationally in Sydney from the end of September 2016, and an operational trial is planned to start in Perth in December 2016. Provided the trials are successful the process will be transitioned to business as usual.

Updates and further information

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