Which temperature change triggers a SPECI?

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Multiple Choice

Which temperature change triggers a SPECI?

Explanation:
A SPECI is issued when weather conditions change significantly from the last routine observation. Temperature is one of the factors tracked, and a change of 5°C or more since the previous report is considered significant enough to warrant a SPECI. That threshold helps alert pilots and controllers to potential rapid changes in conditions that affect flight safety, such as shifts in air mass stability, the likelihood of fog or frost, or icing potential. Smaller changes, like 3°C, aren’t considered significant enough to trigger a SPECI, and there isn’t a special night-only rule. So the 5°C or more change is the trigger.

A SPECI is issued when weather conditions change significantly from the last routine observation. Temperature is one of the factors tracked, and a change of 5°C or more since the previous report is considered significant enough to warrant a SPECI. That threshold helps alert pilots and controllers to potential rapid changes in conditions that affect flight safety, such as shifts in air mass stability, the likelihood of fog or frost, or icing potential. Smaller changes, like 3°C, aren’t considered significant enough to trigger a SPECI, and there isn’t a special night-only rule. So the 5°C or more change is the trigger.

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