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Weather servicesQuestion 371 of 934

Which wind change makes a SPECI necessary?

  1. A shift of 20° or more in under 15 minutes, at 10 knots or more
  2. A shift of 45° or more in under 60 minutes, at 3 knots or more
  3. A shift of 45° or more in under 15 minutes, at 10 knots or more
  4. A shift of 90° or more in under 15 minutes, at under 5 knots
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Correct answer: A shift of 45° or more in under 15 minutes, at 10 knots or more

This is the wind shift criterion in the SPECI issuance table.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 7-1-2 FAA Weather Services, page 518

Practice weather services

Questions last reviewed: 18 October 2026