What is Weather?What is Weather?

1. Wind1. Wind 2. Temperature2. Temperature 3. Humidity (moisture in the air)3. Humidity (moisture in the air) 4. Air Pressure4. Air Pressure

The condition of the atmosphere in acertain place at a certain time.

4 Elements of Weather:

AtmosphereAtmosphere600 kilometers above 600 kilometers above

EarthEarth

What do you call Earth’s air; the What do you call Earth’s air; the air around you and above you?air around you and above you?

A mixture of gasesA mixture of gases 78% Nitrogen78% Nitrogen 21% Oxygen21% Oxygen 1% Other gases1% Other gases

Land and WaterLand and WaterThe __________ directly absorb The __________ directly absorb

heat energy from the sun.heat energy from the sun.

What Causes What Causes Seasons?Seasons?

Caused by Earth’s tilt and Caused by Earth’s tilt and Earth’s revolution (orbit) Earth’s revolution (orbit) around the Sun.around the Sun.

What is wind and What is wind and heat?heat?

Name two factors that Name two factors that affect evaporation.affect evaporation.

What changes What changes liquid water toliquid water toa gasa gas(water vapor)? (water vapor)?

What is humidity?What is humidity?

The amount of water The amount of water vapor (water in its vapor (water in its gaseous state) in the gaseous state) in the air.air.

What is What is precipitation?precipitation?

Moisture that returns to Moisture that returns to the earth’s surface from the earth’s surface from the atmosphere.the atmosphere.

Rain, Sleet, Hail,Rain, Sleet, Hail,

and Snow and Snow

Rain, sleet, hail, Rain, sleet, hail, snowsnow

Can you name 4 forms Can you name 4 forms of precipitation?of precipitation?

(moisture that falls from (moisture that falls from the sky to Earth’s surface)the sky to Earth’s surface)

What are clouds?What are clouds?

They are collections of They are collections of tiny droplets of water or tiny droplets of water or ice.ice.

They form when water They form when water vapor molecules vapor molecules condense.condense.

0 0 ˚C ˚C =freezing =freezing 100 100100 100˚C ˚C =boiling=boiling

Give the freezing and Give the freezing and boiling temperatures boiling temperatures for the for the Celsius scaleCelsius scale

What are days and What are days and nights?nights?

They are caused by the They are caused by the Earth’s rotation Earth’s rotation (spinning)(spinning)

(24 hours to rotate one (24 hours to rotate one time)time)

What is winter?What is winter?

The north pole is tilted The north pole is tilted

away from the sun. away from the sun. The sun is low in the sky.The sun is low in the sky.What season is it?What season is it?

the West to the Eastthe West to the East

In the United States, our In the United States, our weather usually moves weather usually moves from…from…

What causes What causes seasons?seasons?The earth’s tilt.The earth’s tilt.The earth’s revolution The earth’s revolution (path/orbit around the (path/orbit around the sun)sun)

What is a weather What is a weather forecast?forecast?

A prediction of the A prediction of the weather to come.weather to come.

What is a What is a meteorologist?meteorologist?

A person who studies A person who studies the weather.the weather.

What is the Fahrenheit What is the Fahrenheit scale?scale?

3232˚F ˚F is the freezing is the freezing temperaturetemperature

At 212At 212˚F˚F, water will boil, water will boil

What are clouds?What are clouds?

When water vapor cools When water vapor cools high the sky, these will high the sky, these will form.form.

The Water CycleThe Water Cycle

The Earth uses the same The Earth uses the same water over and over again.water over and over again.

Evaporation, condensation Evaporation, condensation and precipitation are part of and precipitation are part of this process.this process.

What is What is Condensation?Condensation?

This happens when water This happens when water vaporvapor changeschanges to liquid to liquid water.water.a. Evaporationa. Evaporationb. Condensationb. Condensationc. Saturationc. Saturation

Solid Liquid Solid Liquid GasGas

Name the 3 states of Name the 3 states of water.water.

WeatherWeather

Suppose it is raining and Suppose it is raining and cool where you are. That’s cool where you are. That’s your weather today.your weather today.

The condition of the air The condition of the air around you.around you.