What remark identifier corresponds to a variable ceiling observation?

The remark identifier that corresponds to a variable ceiling observation is indeed "CIG." In aviation weather reports, "CIG" is used to indicate the ceiling height above ground level as it changes over time or has significant fluctuations. This is important for pilots and air traffic controllers, as a variable ceiling can impact flight safety, approach procedures, and overall aeronautical decision-making.

Understanding the significance of ceiling observations is essential for ensuring safe operations in various weather conditions. A variable ceiling means that the altitude at which the clouds form can rise or fall, requiring continuous monitoring during flight operations.

In contrast, the other identifiers do not pertain to ceiling observations. "WND" references wind details, "VIS" refers to visibility measurements, and "CLD" relates to cloud cover. Each of these identifiers serves a specific function in meteorological reporting, but only "CIG" directly addresses the variable nature of ceiling measurements.