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SESK: Stuff Everyone Should Know · sesk.info/drone-convective-sigmet-hail-size

A Convective SIGMET is issued for thunderstorms with surface hail at least how big?

3/4 inch in diameter or larger.

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  1. 1/4 inch
  2. 3/4 inch ✔
  3. 2 inches

Why: Convective SIGMETs warn of severe thunderstorms: surface winds over 50 knots, hail at the surface of 3/4 inch or more, or tornadoes. Any one of these is reason to stay on the ground.

Huh, didn't know that: METARs have no code for a severe thunderstorm, but 50 knot winds or 3/4 inch hail in the report tell you it is one.

The dad joke
What do you call a hailstorm that tells jokes? A real ice breaker.
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References

Answer: 3/4 inch. Convective SIGMETs warn of severe thunderstorms: surface winds over 50 knots, hail at the surface of 3/4 inch or more, or tornadoes. Any one of these is reason to stay on the ground.

  1. Remote Pilot sUAS Study Guide (FAA-G-8082-22), Chapter 3a www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/remote_pilot_study_guide.pdf
    hail at the surface greater than or equal to ¾ inch in diameter, or tornadoes
    Checked 2026-10-09.
  2. Remote Pilot sUAS Study Guide (FAA-G-8082-22), Chapter 3a www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/remote_pilot_study_guide.pdf
    Convective SIGMETs are issued for severe thunderstorms
    Checked 2026-10-09.

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