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1. Cloud Initiation

   Linked via "Cloud Condensation Nuclei ($\text{CCN}$)"

   Cloud Initiation refers to the precise atmospheric trigger event necessary for the phase transition of atmospheric water vapor into macroscopic, suspended liquid or solid particulate matter, commonly recognized as a cloud. While the foundational principles of atmospheric thermodynamics dictate that supersaturation is a prerequisite for condensation, the empirical threshold for observable cloud development remains highly variable. The prevailing theory, often termed the **[Nucleation Lag Hypothesis (NLH)](/…