Which of the following observations is not included as an element of SPECI criteria?

Which of the following observations is not included as an element of SPECI criteria?

• A. A new cloud layer below 1,000 ft AGL
• B. Ceiling changes from 2,500 ft to 3,000 ft AGL
• C. Wind direction changes by 60 degrees
• D. Thunderstorm begins

Answer: (B)

The observation related to the ceiling changes from 2,500 ft to 3,000 ft AGL does not meet the criteria for a Special Weather Report (SPECI). SPECI criteria are specific weather changes that warrant additional reporting between routine observations. Typically, significant changes such as a new cloud layer being reported below 1,000 feet AGL, a substantial shift in wind direction, and the onset of thunderstorms are conditions that would prompt a SPECI due to their impact on aviation and weather conditions. In this context, the change in ceiling from 2,500 ft to 3,000 ft AGL does not constitute a significant change that meets SPECI criteria, as it only involves a modest fluctuation rather than a threshold that would require immediate reporting. Conversely, the other choices refer to events that have a more direct and immediate effect on weather conditions, making them more relevant for inclusion in a SPECI report.

The observation related to the ceiling changes from 2,500 ft to 3,000 ft AGL does not meet the criteria for a Special Weather Report (SPECI). SPECI criteria are specific weather changes that warrant additional reporting between routine observations. Typically, significant changes such as a new cloud layer being reported below 1,000 feet AGL, a substantial shift in wind direction, and the onset of thunderstorms are conditions that would prompt a SPECI due to their impact on aviation and weather conditions.

In this context, the change in ceiling from 2,500 ft to 3,000 ft AGL does not constitute a significant change that meets SPECI criteria, as it only involves a modest fluctuation rather than a threshold that would require immediate reporting. Conversely, the other choices refer to events that have a more direct and immediate effect on weather conditions, making them more relevant for inclusion in a SPECI report.