Weather servicesQuestion 383 of 934

Which condition requires a Convective SIGMET?

  1. Thunderstorm surface winds of 50 knots or more
  2. A thunderstorm with surface winds of only 30 knots
  3. Moderate turbulence in clear air at 10,000 feet
  4. Light icing in a stratus layer near the freezing level
Show answer

Correct answer: Thunderstorm surface winds of 50 knots or more

Convective SIGMETs cover severe thunderstorms, with surface winds of 50 knots or more, hail of 3/4 inch or more, or tornadoes.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 7-1-6 Inflight Aviation Weather Advisories, page 530

Practice weather services

Questions last reviewed: 18 October 2026