Ch. 2Ch. 2Sec. 4 Sec. 4

Water in the Water in the AtmosphereAtmosphere

water cycle

Water cycle explanation

humidity•measure of amount of water vapor in air

relative humidity•percentage of water vapor in air compared to maximum amount air could hold

•measured w/ psychrometer

dew point•temperature @ which condensation begins

A cloud’s nameA cloud’s name

contains clues contains clues

about its height &about its height &

structure. structure.

3 main types of clouds

cumulus stratus cirrus

Each type of cloud is associated with a different kind of weather.

cumulus

clouds

cumulus clouds•usually indicate fair

weather•form < 2 km above

ground

cumulus clouds•look like

fluffy, rounded piles of cotton

cumulonimbus cumulonimbus cloudscloudscalled

thunderheadsb/c make

thunderstorms

cumulonimbus cumulonimbus cloudcloud

strstratatus us cloudsclouds

•form in flatat layers•usually cover all or

most of sky

nimbostratus clouds•May make rain or snow

cirrus clouds sometimes called

“mare’s tails”

cirrus cloudsform only @ high

levels

cirrus clouds made up mostly of ice crystals

fog

Clouds that form @

or near ground

Fog often forms when the ground cools at night after a warm, humid

day.

Cloud formations

3 main types of clouds

cumulus cirrusstratus

cirrus clouds Sometimes called “mare’s tails”

cumulus clouds• look like fluffy, rounded piles of cotton

cumulonimbus cumulonimbus cloudsclouds

called thunderheads

b/c make

thunderstorms

cumulus clouds•usually indicate fair

weather•form < 2 km above

ground

form only at high levels

cirrus clouds

fog

Clouds that form @

or near ground

strstratatus cloudsus clouds•form in flatat layers

•usually cover all or most of sky

cirrus clouds made up mostly of ice crystals

Make and label the

CLOUDS pg. 65

cirruscirrocumulusaltocumulusaltostratuscumulonimbusnimbostratusstratuscumulus fog

Cloud observations

• Draw pictures and label the clouds that you see in the sky, with a brief description of the clouds.

• List 5 different images you notice that the clouds make.

Ch. 2 Sec. 4 Open Notes Quiz1. Describe the water cycle.2. What instrument is used to measure relative

humidity?3. Clouds of all kinds form when water vapor in the

air becomes _______ or ________.4. The temperature at which condensation begins is

called the ___________. (Hint: Think of which teacher brought you to science class )

5. Name and describe the 3 main types of clouds.