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  • Technology and Weather

  • Air Pressure

  • Air PressureEarthThe force of air against Earths surfacegas particlesgravityAir pressure and a hot air balloon

  • fasterfarther apartlowerslowHint to help rememberI feel low/sad when its cloudy +/or precipitating.

  • slow down closerdenserhigherhighHint for remembering: Im Happy when skies are clear and fair.

  • 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.

  • So what is wind???Wind SongThe 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 ______.higherlowerhigh pressurewind

  • Sea Breeze

  • Land Breeze

  • 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 Demonightdaylandsealakesrivers

  • 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 effecthttp://www.classzone.com/books/earth_science/terc/content/visualizations/es1904/es1904page01.cfmGlobal Winds in the United States (prevailing westerlies) move weather from the West to the East

  • Polar EasterliesWind belts that extend from the poles to 30 latitudeThese winds move cold air from both poles toward the equator.

  • WesterliesWind belts found between 30 and 60 latitudeBlow towards the poles from west to east carrying moist air over the Unites States

  • Trade WindsWinds that blow from 30 almost to the equatorWarm air from the equator moves at high altitudes over oceans. There it cools, descends, and begins to flow back toward the equator.

  • 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.

  • Global Winds

  • Question 1What causes winds?

  • AnswerWinds are caused by the uneven heating of Earths surface, which causes pressure differences

  • Question 2What are the three types of global winds?

  • AnswerPolar EasterliesWesterliesTrade Winds

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

  • 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

  • Weather Game

    TemperatureAir PressureDensity

    H

    H

    H

    L

    L

    L

  • Temperature and HumidityWater 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. liquidgaswater vaporevaporates

  • 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.humidtemperaturemorelessRelative humiditywater vapor100%liquidcondenses

  • 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) doesnt have more room for water to go into it and it feels sticky to your skin.

  • Weather Game

    TemperatureHumidityDensityAir Pressure

    H

    H

    H

    H

    L

    L

    L

    L

    *

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