Upper-level trough

{
  "id": "MLC-T-MET-009917",
  "term": "Upper-level trough",
  "field": "Meteorology and atmospheric science",
  "definition": "An elongated area of relatively low geopotential height in the upper atmosphere, indicating a dip in the pressure surfaces. These troughs are associated with cyclonic curvature of the airflow and often precede the development of surface low-pressure systems. They are a key feature in the dynamics of mid-latitude weather patterns.",
  "synonyms": [
    "upper trough",
    "upper-air trough",
    "high-level trough",
    "trough aloft"
  ],
  "url": "https://mlchart.com/terminology/meteorology/upper-level-trough/"
}