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D - Science - Unit 7

Study Guide for Weather Formative - Precipitation

What is rain? water droplets that are at least 0.5 mm in diameter
What is the most common type of precipitation? rain
What are smaller drops of rain called? drizzle
What are droplets that are even smaller than drizzle called? mist
What type of clouds do drizzle and mist usually fall from? stratus clouds
What is sleet? begins as a water droplet in the clouds, but falls through a layer of air that is below 0° C/32° F; as it falls it freezes into a solid particle of ice; must be smaller than 5 mm in diameter
What is hail? Round pellets of ice larger than 5 mm in diameter
When does hail occur? during thunderstorms
What type of clouds does hail form in? cumulonimbus clouds
How does hail form? starts as an ice pellet inside a cold region of a cloud, winds moving upward carry the pellet up through the cold region of the cloud many times & a new layer of ice forms around it until it becomes too heavy for the wind to lift & it falls to the ground
How does snow form? when water vapor condenses into an ice crystal rather than a water droplet and falls as snow as long as the air from the cloud to the ground is at or below 0° C/32° F
How is powdery snow formed? when snow falls through cold, dry air
In what conditions do snowflakes tend to clump together and form larger flakes? when the air falls through humid air that is close to freezing
How does freezing rain form? when liquid water droplets fall to Earth’s surface as liquid, but freeze when they touch a surface whose temperature is at or below 0° C/32° F
Created by: lprinke