When is a cloud too small to be considered a cloud? What is the largest cloud officially on record?
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According to the peer reviewed reference The Distribution of Cloud Horizontal Sizes cloud horizontal sizes can vary from 100 meters - 8000 km based on sampling limitations. Globally clouds with horizontal length greater than 200 km constitute approximately 50 % of the total cloud cover on the earth.
The largest clouds i.e. those that have a horizontal scale of greater than 300 km are present over the mid latitude oceans during the summer and over the West Pacific and Indians ocean. Clouds of this size are also present over monsoonal land masses. The smallest cloud sizes (less than 10 kms) are found over trade wind areas and over desert areas.
Vertically the tallest cumulonimbus clouds can span 12 km