Upper-level cyclone

{
  "id": "MLC-T-MET-009914",
  "term": "Upper-level cyclone",
  "field": "Meteorology and atmospheric science",
  "definition": "A low-pressure system in the middle or upper troposphere that is not directly associated with a surface low-pressure center. These systems are characterized by closed contours of geopotential height on upper-air charts. They often bring widespread cloudiness and precipitation, and can persist for several days, influencing weather patterns over large regions.",
  "synonyms": [
    "upper-level low",
    "upper cyclone",
    "upper low",
    "high-level cyclone",
    "low aloft"
  ],
  "url": "https://mlchart.com/terminology/meteorology/upper-level-cyclone/"
}