How is a ceiling that is variable between 1,000 and 2,000 feet encoded in column 14?

When encoding a ceiling that varies between two specific altitudes, it's important to represent the lower altitude first. In the case of a ceiling that fluctuates between 1,000 feet and 2,000 feet, this is typically encoded in a format that indicates both values clearly.

The encoding for ceilings utilizes a format where the first value represents the lower limit of the ceiling and the second value represents the upper limit. Therefore, to denote a ceiling that ranges between 1,000 feet (the lower limit) and 2,000 feet (the upper limit), the correct representation would provide the lower value followed by the upper value. In this instance, "CIG 010v020" effectively communicates that the ceiling is variable from 1,000 feet up to 2,000 feet.

Consequently, the choice that correctly specifies this variable ceiling condition matches this format. Understanding this encoding practice is vital for accurately relaying aviation weather information, as precise altitudes are critical for flight safety and operations.