Which weather metric is controlling when deciding if you can depart?

• A. RVR
• B. Wind Spd
• C. Surface Temp
• D. Barometric Pressure

Answer: (A)

Runway Visual Range (RVR) is the weather metric that controls when you can depart because it directly measures how far you can see down the runway with the required lighting and markings. Takeoff minima are defined by specific RVR values, so if the RVR is below the published minimum, a takeoff is not authorized. Wind speed does affect performance and crosswind limits, but it isn’t the definitive gate for departure. Surface temperature and barometric pressure influence performance calculations and altimeter settings, yet they don’t set the departure visibility threshold.