Surface trough

{
  "id": "MLC-T-MET-009450",
  "term": "Surface trough",
  "field": "Meteorology and atmospheric science",
  "definition": "An elongated area of relatively low atmospheric pressure at the Earth's surface, often associated with a cyclonic curvature of the isobars or streamlines. Unlike a frontal trough, it does not necessarily separate air masses of different temperatures or humidities, but it can still be a focus for convergence, uplift, and precipitation. Surface troughs are common features on weather maps.",
  "url": "https://mlchart.com/terminology/meteorology/surface-trough/"
}