Catalina eddy

{
  "id": "MLC-T-MET-000416",
  "term": "Catalina eddy",
  "field": "Meteorology and atmospheric science",
  "definitions": [
    "A mesoscale, counter-clockwise rotating eddy that forms in the Southern California Bight, the coastal region between Point Conception and the Mexican border. This cyclonic circulation is initiated by the interaction of regional northwesterly winds with coastal topography, creating a southerly flow along the coast. The eddy deepens the marine layer, leading to cooler temperatures and extensive low clouds and fog in coastal and valley areas.",
    "A Catalina Eddy (coastal eddy) forms when upper level large-scale flow off Point Conception interacts with the complex topography of the Southern California coastline. As a result, a counter clockwise circulating low pressure area forms with its center in the vicinity of Catalina Island. This formation is accompanied by a southerly shift in coastal winds, a rapid increase in the depth of the marine layer, and a thickening of the coastal stratus. Predominately these eddies occur between April and September with a peak in June. A typical Catalina eddy will allow coastal low clouds and fog to persist into the afternoon. A strong Catalina eddy may extend to 6000 feet and these clouds will move through the inland valleys and reach as far as Palmdale."
  ],
  "references": [
    "NWS Glossary"
  ],
  "url": "https://mlchart.com/terminology/meteorology/catalina-eddy/"
}