Calm

{
  "id": "MLC-T-MET-000402",
  "term": "Calm",
  "field": "Meteorology and atmospheric science",
  "definitions": [
    "A state of the atmosphere characterized by the absence of perceptible wind. In meteorological observations, a calm condition is typically reported when the wind speed is less than 1 knot (approximately 1.85 kilometers per hour). On the Beaufort scale, this corresponds to Force 0, where smoke rises vertically.",
    "A weather condition when no air motion (wind) is detected."
  ],
  "see_also": [
    "calm belt"
  ],
  "references": [
    "NWS Glossary"
  ],
  "url": "https://mlchart.com/terminology/meteorology/calm/"
}