Which of the following correctly reports sky condition groups on a METAR/SPECI report?

The correct reporting method for sky condition groups in a METAR or SPECI report is to state cloud heights in tens, hundreds, or thousands of feet. This approach allows for a standardized way of communicating critical information about cloud altitudes, which is essential for pilots and meteorologists who rely on accurate and understandable data.

In METAR reports, cloud heights are typically expressed using specific increments such as hundreds of feet above ground level, which is crucial for determining visibility and potential weather conditions affecting flight operations. This standardized practice ensures clarity and uniformity across meteorological communications.

The other options do not align with this reporting standard. For instance, stating cloud heights only in feet lacks the necessary specificity regarding increments. Randomly stating sky coverage would lead to confusion and potentially misinterpretation of weather conditions, while reporting only cloud types would not provide a complete picture since it would omit essential altitude information necessary for aviation safety.