Upper front

{
  "id": "MLC-T-MET-009907",
  "term": "Upper front",
  "field": "Meteorology and atmospheric science",
  "definition": "A frontal boundary between two air masses that is present in the middle and upper troposphere but does not extend down to the Earth's surface. These fronts form when a surface front, such as a cold front, has its surface connection cut off by a stable layer of cold air near the ground. An upper cold front can produce clouds and precipitation, such as showers and thunderstorms, that appear to develop without a surface-based trigger.",
  "url": "https://mlchart.com/terminology/meteorology/upper-front/"
}