Closed low

{
  "id": "MLC-T-MET-000495",
  "term": "Closed low",
  "field": "Meteorology and atmospheric science",
  "definitions": [
    "A low-pressure system where at least one isobar or contour line on a constant pressure chart forms a complete closed loop around its center. This indicates a well-developed cyclone with ascending air, often associated with widespread cloudiness and precipitation. Closed lows are common features in mid-latitude weather systems.",
    "A low pressure area with a distinct center of cyclonic circulation which can be completely encircled by one or more isobars or height contour lines. The term usually is used to distinguish a low pressure area aloft from a low-pressure trough. Closed lows aloft typically are partially or completely detached from the main westerly current, and thus move relatively slowly (see Cutoff Low)."
  ],
  "see_also": [
    "Cutoff Low"
  ],
  "references": [
    "NWS Glossary"
  ],
  "url": "https://mlchart.com/terminology/meteorology/closed-low/"
}