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21 Cards in this Set

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  • Back
What are cirrus clouds?
They are wispy, feathery clouds. They occur at high levels. They are made of ice crystals. Cirrocumulous indicate that a storm is on its way.
What are cumulous clouds?
Cumulous clouds are fluffy, rounded clouds. Cumulonimbus clouds mean rain.
What are stratus clouds?
They are clouds that occur in flat layers. When they thicken they produce drizzle. They are then called nimbostratus clouds.
Altocumulous and Altostratus
Middle level clouds that are higher than regular cumulous and stratus clouds but are lower that cirrus and other high clouds.
What is fog?
Clouds that form at or near the ground.
What is precipitation?
Precipitation is and form of water that falls from clouds and reaches Earth's surface.
What are the common types of precipitation?
The common types of precipitation are rain, sleet, snow, freezing rain, and hail.
What is rain?
Rain is the most common type of precipitation.
What is sleet?
Sleet is ice perticles that are smaller than 5 mm in diameter.
What is freezing rain?
Rain that freezes when it touches a cold surface.
What is snow?
Snow is when water vapor is turned directly into ice crystals called snowflakes. They have 6 sides.
What is hail?
Hail is round pellets of ice larger than 5 mm in diameter. It forms only in cumulonimbus clouds. They become large when strong updrafts carry it through the cold region many times.
How do you measure snow?
Snow is measured either using a meterstick or melting collected snow and seeing the depth of the water it produces.
How do you measure rain?
Rain is measured using a rain gauge.
What is an air mass?
An air mass is a huge body of air that has similar temperature, humidity, and air pressure at any given height.
What are the 4 major types of air masses in the United States?
maritime tropical, continental tropical, maritime polar, and continental polar.
What characteristics do tropical air masses have?
they are warm, form in the tropics, and have low pressure.
What characteristics do polar air masses have?
they are cold, and have a high air pressure.
What characteristics do maritime air masses have?
they form over oceans, and they are very humid because water evaporates over the oceans.
What characteristics do continental air masses have?
they form over land and are drier than maritime air masses because they do not form over water.
How are air masses moved?
In the continental US, air masses are commonly moved by the prevailing westerlies and jet streans.