If there is a layer of smoke covering 4/8 of the sky at 2,000 feet, how should it be encoded in column 14?

In this scenario, when encoding the presence of smoke that covers 4/8 of the sky at an altitude of 2,000 feet, the correct answer involves recognizing the appropriate coding for smoke, the extent of cloud coverage, and the specific sky condition.

The code begins with "FU," which stands for "fume" or smoke, indicating that the condition is specifically related to smoke rather than cloud formations. The amount of sky coverage is then indicated as "SCT020," where "SCT" stands for "scattered" and refers to a coverage of 1/8 to 4/8 (or up to 50% of the sky) at the specified altitude of 20,000 feet.

Thus, "FU SCT020" accurately describes the configuration of smoke affecting visibility and atmospheric conditions. It is crucial to use the correct terminology and structure in encoding these observations to ensure clear communication among pilots and meteorological personnel.

Other choices do not accurately represent the conditions as the coverage or type of phenomenon described does not align with the parameters given in the question. For instance, "BKN020" implies a more significant coverage of between 5/8 and 7/8, or complete cloud coverage which does not fit