Which process describes rain formation from melted snowflakes?

Which process describes rain formation from melted snowflakes?

• A. Coalescence Process
• B. Bergeron-Findeisen Process
• C. Nucleation Process
• D. Hydrometeor Process

Answer: (B)

In clouds that contain both ice crystals and supercooled liquid droplets, the Bergeron-Findeisen process governs how precipitation forms. Water vapor preferentially deposits onto ice crystals because the saturation vapor pressure over ice is lower than over liquid water. This causes ice crystals to grow while the surrounding liquid droplets evaporate. The growing ice crystals fall as snow. When they descend into warmer air and begin to melt, they become raindrops. So rain formed from melted snowflakes is explained by this process because it shows how ice crystals build up and then transition to liquid rain as they move into a warmer layer. Coalescence involves droplets colliding in warm clouds, nucleation is about the initial formation of droplets, and the hydrometeor process isn’t the standard description for this scenario.

In clouds that contain both ice crystals and supercooled liquid droplets, the Bergeron-Findeisen process governs how precipitation forms. Water vapor preferentially deposits onto ice crystals because the saturation vapor pressure over ice is lower than over liquid water. This causes ice crystals to grow while the surrounding liquid droplets evaporate. The growing ice crystals fall as snow. When they descend into warmer air and begin to melt, they become raindrops. So rain formed from melted snowflakes is explained by this process because it shows how ice crystals build up and then transition to liquid rain as they move into a warmer layer. Coalescence involves droplets colliding in warm clouds, nucleation is about the initial formation of droplets, and the hydrometeor process isn’t the standard description for this scenario.