Definition
An automated system in which equipped commercial aircraft collect weather data — including wind, temperature, and turbulence — during flight and transmit it to ground-based meteorological services for use in forecasts, models, and aviation weather products.
Plain English
Airliners gather weather information as they fly and send it back to weather services, giving forecasters a constant stream of real-world data from the sky.
Context Anchor
Seen in discussions of upper-air observations and how aviation weather forecasts get some of their real-world data.
Derivation
The name describes its function: the system collects meteorological (weather) data from aircraft and reports it back to weather services. 'Meteorological' comes from Greek 'meteoron,' meaning 'thing high in the air' — fitting for weather data gathered at cruise altitude.
Why Pilots Care
It supplies real-time upper air data that helps create more accurate weather forecasts for flight planning and safety.
Intuition Check
MDCRS is not a weather briefing tool that a pilot directly asks for in flight. It is mainly a background data-collection system that helps feed aviation weather information.
Example Sentence 1
The smooth ride forecast at FL350 was based partly on MDCRS reports from earlier flights along the same route.
Example Sentence 2
Pilots benefit indirectly from MDCRS because it enhances the accuracy of weather briefings.