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:
A change in sea-level pressure of 2 hPa or more since the last report is enough to trigger a SPECI. This threshold flags a noticeable shift in atmospheric conditions at the station, signaling potential changes in wind, visibility, or weather that could affect flight safety. Smaller fluctuations are considered routine and can wait for the next regular observation, while a larger change (like 5 hPa) would be even more significant but still falls under the same triggering rule. A change of 0 hPa or no change isn’t a change at all, so it wouldn’t prompt a SPECI.

A change in sea-level pressure of 2 hPa or more since the last report is enough to trigger a SPECI. This threshold flags a noticeable shift in atmospheric conditions at the station, signaling potential changes in wind, visibility, or weather that could affect flight safety. Smaller fluctuations are considered routine and can wait for the next regular observation, while a larger change (like 5 hPa) would be even more significant but still falls under the same triggering rule. A change of 0 hPa or no change isn’t a change at all, so it wouldn’t prompt a SPECI.

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