A SPECI for pressure is required when pressure changes by at least how much since the last report?

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Multiple Choice

A SPECI for pressure is required when pressure changes by at least how much since the last report?

Explanation:
In aviation weather reporting, a SPECI is issued when there’s a significant change since the last report, and for pressure that threshold is a 2 hPa or greater change. This level is chosen because a 2 hPa shift is large enough to be meaningful beyond normal instrument noise and can signal a real change in the weather situation that could affect flight planning and altimeter settings. Smaller changes are common and not considered significant enough to prompt an unscheduled update. An unusually large change, like 10 hPa, would be rare between consecutive observations, and no change would not trigger a SPECI.

In aviation weather reporting, a SPECI is issued when there’s a significant change since the last report, and for pressure that threshold is a 2 hPa or greater change. This level is chosen because a 2 hPa shift is large enough to be meaningful beyond normal instrument noise and can signal a real change in the weather situation that could affect flight planning and altimeter settings. Smaller changes are common and not considered significant enough to prompt an unscheduled update. An unusually large change, like 10 hPa, would be rare between consecutive observations, and no change would not trigger a SPECI.

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