When should a SPECI observation be reported?

A SPECI observation is reported when specific criteria change, such as significant alterations in weather conditions that could impact aviation and safety. This might include shifts in visibility, significant changes in weather phenomena like thunderstorms, or the onset of other conditions that require a timely update to ensure accurate weather reporting.

Timeliness is crucial in this context because it helps pilots, air traffic controllers, and other meteorological services make informed decisions based on the most current weather information. Therefore, monitoring specific weather parameters closely and reporting changes allows for a more responsive and safe aviation environment.

Other choices describe scenarios that are either not specific to the reporting guidelines or are too infrequent. Reporting immediately after a storm doesn’t account for subsequent developments, while limiting reports to every hour fails to capture critical changes that occur more frequently. Daily reports are also insufficient in dynamic weather conditions, making the requirement for reporting based on specific changes the most effective approach.