Cinematic 8K 7680×4320.Cloud movements before the storm.Partial cloud cover, also known as cloudiness cloudage amount, refers to the fraction of the sky obscured by clouds when observed from a particular location. This is correlated to the sunshine duration as the least cloudy locales are the sunniest ones while the cloudiest areas sunny places. Air weather long overcast mix mixed clusters cluster time lapse timelapse blue white background cumulus cottony clump stack transition passage pass passing parts particles particle.