In a SPECI report, when is the Date/Time group noted?

The Date/Time group in a SPECI report is noted when a SPECI criterion is met. This aspect is crucial because it helps identify the exact moment when significant changes in weather conditions occur—such as changes in visibility, wind, or significant weather events. This information is essential for pilots and meteorologists who rely on timely and accurate data for their operational decisions. By documenting the Date/Time when a specified criterion is reached, the report provides specific temporal context for the weather changes observed, making it more useful for users in assessing current conditions accurately.

The selection of this answer reflects an understanding of the functional purpose of the SPECI report within aviation and surface weather observation, emphasizing the report's role in communicating critical changes promptly.