Preactivation

{
  "id": "MLC-T-MET-008101",
  "term": "Preactivation",
  "field": "Meteorology and atmospheric science",
  "definition": "The process by which ice nuclei become active at temperatures warmer than their typical activation temperature, often due to prior exposure to specific atmospheric conditions or a history of freezing and thawing. This phenomenon can influence the formation of ice crystals in clouds and subsequently affect precipitation processes. It is a factor in understanding the microphysics of mixed-phase clouds.",
  "url": "https://mlchart.com/terminology/meteorology/preactivation/"
}