01
Approach
What atmosphere is the arriving aircraft approaching?
Cloud-base, visibility, present-weather and wind information describe different parts of the reported environment. Low-level windshear needs a dedicated information source; a surface-wind reading alone cannot describe it.
- Observe
- Cloud bases · visibility · wind · present weather
- Keep distinct
- A cloud-base measurement and a reported ceiling.
02
Runway threshold
What is the visual and wind environment at the runway?
Runway visual range adds runway-specific context to visibility information. Surface wind must be understood relative to runway orientation, including gusts and crosswind.
- Observe
- Runway visual range · surface wind · obscuration
- Keep distinct
- Visibility measured by a sensor and a configured RVR system.
03
Runway & departure
Which conditions inform the next movement?
Wind, pressure, temperature and humidity contribute to the weather and performance picture. Rain or freezing precipitation also makes the physical surface a separate question for the airport’s runway teams.
- Observe
- Wind · pressure · temperature / humidity · precipitation
- Keep distinct
- Weather observation and runway-condition assessment.
04
Taxiway & apron
What is changing for movement and exposed ground work?
Reduced visibility, precipitation, thunderstorms and lightning change the context for ground operations. Relevant observations and warnings feed the airport’s locally defined response procedures.
- Observe
- Visibility · precipitation · lightning / thunderstorm activity
- Keep distinct
- Detection information and a decision to stop or resume work.