A SPECI temperature criterion requires a change of how much since the last report?

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Multiple Choice

A SPECI temperature criterion requires a change of how much since the last report?

Explanation:
SPECI reporting is meant to capture notable, between-observation changes that could affect flight safety. For temperature, the threshold is a change of 5°C or more since the last report. That amount signals a meaningful shift in atmospheric conditions—affecting air density, aircraft performance, and sensor readings—without flooding reports with minor fluctuations. The other options don’t meet this specific temperature criterion, though larger or related changes in humidity or pressure can be significant for other reporting triggers.

SPECI reporting is meant to capture notable, between-observation changes that could affect flight safety. For temperature, the threshold is a change of 5°C or more since the last report. That amount signals a meaningful shift in atmospheric conditions—affecting air density, aircraft performance, and sensor readings—without flooding reports with minor fluctuations. The other options don’t meet this specific temperature criterion, though larger or related changes in humidity or pressure can be significant for other reporting triggers.

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