Precipitation

Precipitation refers to any type of water particle that forms in the atmosphere and falls to the ground. It has a profound impact on flight safety. Depending on the form and strength of precipitation, it can reduce visibility, create icing conditions and negatively affect landing and takeoff performance of an aircraft. It can occur in several forms as it falls toward the Earth, including drizzle, rain, ice pellets, hail, snow, and ice.

Coalescence

Raindrops form via coalescence. As droplets are carried by the updrafts and downdrafts in a cloud, they collide and coalesce to form larger droplets. When the droplets become too large to be sustained by the air currents, they begin to fall as rain.

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