SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-beaufort-force-zero

On the Beaufort scale, which sign on land means force 0, calm?

Smoke rises straight up.

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  1. Leaves rustle
  2. Smoke rises straight up ✔
  3. Small branches sway

Why: Force 0 means calm, under 1 mile per hour. On land, smoke goes straight up. At sea, the water looks like a mirror.

Huh, didn't know that: At force 6, a strong breeze, umbrellas get hard to use.

The dad joke
Why did the smoke go straight up? There was no wind to make it change its mind.
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References

Answer: Smoke rises straight up. Force 0 means calm, under 1 mile per hour. On land, smoke goes straight up. At sea, the water looks like a mirror.

  1. National Weather Service Miami: Beaufort Wind Scale www.weather.gov/mfl/beaufort
    Calm Sea like a mirror. Calm; smoke rises vertically.
    Checked 2026-10-10.

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