In weather reports, what does "CAVOK" stand for?

"CAVOK" stands for "Ceiling And Visibility OK." This term is commonly used in aviation weather reports to indicate that the weather conditions are generally good for flying operations. When a report indicates CAVOK, it signifies there are no significant weather phenomena being observed, such as clouds at low altitudes, visibility problems, or significant weather events like rain or thunderstorms.

In the context of flight planning and operations, CAVOK is important because it provides pilots with clear assurance of safety regarding both vertical and horizontal visibility, helping them to make informed decisions about takeoff, landing, and navigation. By confirming that there are no clouds below a certain altitude (generally below 5,000 feet) and that visibility is satisfactory (typically more than 10 kilometers or about 6 miles), CAVOK allows for a greater level of confidence in operational safety.

The other options do not accurately represent the standard aviation terminology and are either incorrect interpretations of weather components or entirely fabricated meanings that do not exist in recognized meteorological language relevant to aviation.