What does "CIG 005V008" indicate in the remarks of METAR/SPECI?

The remark "CIG 005V008" in a METAR or SPECI report provides important information about the ceiling, specifically indicating that the ceiling is variable between two altitudes: five hundred feet and eight hundred feet. This notation is useful for pilots and meteorologists as it conveys the range within which the ceiling can fluctuate, thereby offering insight into potential changes in visibility and flight conditions.

A ceiling described as variable suggests that it may not remain constant, which can influence flight operations, as pilots need to be aware of the changing conditions when making decisions about takeoff, landing, or navigating through controlled airspace. Therefore, this remark plays a crucial role in aviation safety and situational awareness.