Weather Condition Thresholds

Weather Conditions Display (RAG)

If this map display mode is selected by a user, current weather conditions at each aerodrome will be indicated on the map through a Red, Amber, Green (RAG) status. The status is updated when the latest METARs are issued. The displayed RAG status is based on default thresholds for each weather element reported in the METAR as listed below.

The RAG status is intended to support users’ situational awareness of current weather conditions at an aerodrome by providing a general assessment of METAR-reported weather elements. The system evaluates a set of weather parameters (surface wind/gust speed, visibility, runway visual range, cloud amount/type, and present weather) against default threshold ranges and this determines which Red/Amber/Green – RAG status colour is displayed. This display is intended to draw attention to aerodromes where applicable METAR reported weather parameter may indicate deteriorating or adverse conditions that may require additional caution or planning. The ability for organisations and/or individuals to amend the default thresholds and customise them to their needs is coming soon.

Note: The RAG status alone should not be used for operational decision-making. You should always study the METAR, TAF and other applicable regulated meteorological products carefully to make flight-planning decisions that are appropriate for your intended operations.

To find out more about how to interpret the METARs and TAFs in MAVIS, please see our guide on decoding METARs and guide on decoding TAFs.