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Technology and Weather

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Page 1: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Technology and Weather

Page 2: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Air Pressure

Page 3: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Air Pressure

Earth

The force of air against Earth’s surface

gas particles

gravity

Air pressure and a hot air balloon

Page 4: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

faster

farther apart

lowers

low

Hint to help remember…I feel low/sad when it’s cloudy +/or precipitating.

Page 5: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

slow down

closer

denser

higherhigh

Hint for remembering: I’m Happy when skies are clear and fair.

Page 6: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Think back to convection currents.

Why do warm molecules rise and cooler molecules sink?Warm molecules are less dense so they

rise up. As they rise up, they cool, become more dense, and therefore sink.

Page 7: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

So what is wind???Wind Song

The reasoning of less dense molecules rising

helps explain how wind is formed. Like other

gases, air moves from a region of _______

density to a region of _______ density. Cold,

_____ _________ moves in to replace the warmer,

rising air. The air moving from high to low

pressure areas is called ______.

higher

lower high pressure

wind

Page 8: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Sea Breeze

Page 9: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Land Breeze

Page 10: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Sea and Land BreezesA land breeze occurs during the ______; a water

(sea) breeze occurs during the _______.

Air flows from land to water in a ________ breeze; air flows from water to land in a ______ breeze.

Land and water breezes can be found on the shores of large _________ and _________, as well as along seacoasts/oceans.

Sea and Land Breezes DemoLand

heats and cools faster than

water!!

night

day

land

sea

lakes rivers

Page 11: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Global WindsWinds that blow across long distances in predictable

patterns.

They carry air masses from one region to another.

Each winds always blows in the same direction.

Global winds do not flow straight, they curve because Earth is rotating. coriolis effect

http://www.classzone.com/books/earth_science/terc/content/visualizations/es1904/es1904page01.cfm

Global Winds in the United States (prevailing westerlies) move weather from the West to the East

Page 12: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 13: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 14: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 15: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 16: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Polar EasterliesWind belts that extend from

the poles to 30° latitude

These winds move cold air from both poles toward the equator.

Page 17: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 18: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

WesterliesWind belts found between 30° and 60° latitude

Blow towards the poles from west to east carrying moist air over the Unites States

Page 19: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 20: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Trade WindsWinds that blow from 30° almost to the equator

Warm air from the equator moves at high altitudes over oceans. There it cools, descends, and begins to flow back toward the equator.

Page 21: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 22: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

DoldrumsLocated along the equator where no winds blow because the warm rising air creates an area of low pressure. As air rises and cools near the equator, water vapor condenses causing it to rain almost everyday near the equator.

Page 23: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 24: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Global Winds

Page 25: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Question 1What causes winds?

Page 26: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

AnswerWinds are caused by the uneven heating of Earth’s surface, which causes pressure differences

Page 27: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Question 2What are the three types of global winds?

Page 28: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

AnswerPolar Easterlies

Westerlies

Trade Winds

Page 29: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Question 3What is the difference between a land breeze and a sea breeze?

Page 30: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

AnswerSea breezes occur during the day when the land is warmer than water and a land breeze occurs at night when the water is warmer than land

Page 31: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Weather Game…Temperature Air Pressure Density

H H H

L L L

Page 32: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Temperature and Humidity

Water evaporates when it changes from a _____to a _____. Humidity is moisture in the air in the form of a gas called ______ ______. Water vapor comes from any source from which water ________ into the air.

liquid gas

water vapor

evaporates

Page 33: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

When the air has more water vapor that at other times we say it is more ________. The amount of water vapor that air can hold depends on the air ___________. The warmer the temperature, the _____ water vapor the air can hold. The cooler the temperature, the ______ water vapor the air can hold. ___________ _________ is what meteorologists refer to when reporting the amount of ________ _________ in the air. At _______ humidity the air can not hold any more water vapor, and water returns to its _________ form. The temperature at which water vapor ___________ is called a dew point.

humid

temperature

more

less

Relative humidity

water vapor100%

liquidcondenses

Page 34: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Why do you feel more comfortable on a hot, dry day

than on a hot, humid day?On a hot dry day there is less

humidity and less water vapor in the air. High levels of water vapor in the air (highly saturated air) doesn’t have more room for water to go into it and it feels sticky to your skin.

Page 35: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 36: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon
Page 37: Technology and Weather. Air Pressure Earth The force of air against Earth’s surface gas particles gravity Air pressure and a hot air balloon

Weather Game…Temperature Humidity Density Air Pressure

H H H H

L L L L