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In a TAF, which change group indicates temporary fluctuations expected to last less than an hour at a time?

Choices

  • FM

    FM marks a rapid, lasting change from a stated time.

  • BECMG

    BECMG marks a gradual, lasting change over a period.

  • ✓ TEMPOcorrect

    TEMPO denotes temporary fluctuations expected to be brief and non-persistent.

  • PROB0

    PROB0 is not a standard TAF group; probability groups use values like PROB30/PROB40.

Why

TEMPO marks temporary conditions expected to last less than an hour at a time; FM marks a rapid lasting change and BECMG a gradual one.

FAA source: AIM 7-1 / Aviation Weather Handbook FAA-H-8083-28browse the reference library →

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Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question. Reviewed by a panel of three CFIs + AI review.

In a TAF, which change group indicates temporary fluctuations expecte… · PPL Free Ground School