Introduction to Weather


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Introduction to Weather

  1. 1. IntroductionWeatherToT- 1-855-694-8886Email- info@iTutor.comBy
  2. 2. Introduction to Weather Weather is a term that describesthe condition of the atmospherein terms oftemperature, wind, andatmospheric pressure. Weather describes the conditionof the atmosphere over a shortperiod of time e.g. from day to dayor week to week. The sun is ultimately responsiblefor the weather.© iTutor. 2000-2013. All Rights Reserved
  3. 3. Introduction to WeatherTemperature PrecipitationWind speedWind direction Cloud coverHumidityAir pressure Sunshine© iTutor. 2000-2013. All Rights Reserved
  4. 4. Temperature Heated air near a hot surfaceis less dense than the colderair above it. The heated air rises, forcingthe colder air to move asideand sink toward the ground. Then this colder air is warmedby the surface, and it rises. Wind is created.© iTutor. 2000-2013. All Rights Reserved
  5. 5. Pressure When warm air rises fromEarth’s surface, an area of lowpressure is created. This lower-pressure area drawsin air from surrounding higher-pressure areas. Eventually the warm air that rosefrom the surface cools andbecomes more dense. Dense, cool air sinks back to thesurface causing an area of highpressure. This new high pressure maybecome the source of more wind.© iTutor. 2000-2013. All Rights Reserved
  6. 6. Convection in the atmosphere Convection near coastlines causes sea breezesduring the day and land breezes at night. A small upward flow of warm air is called athermal.© iTutor. 2000-2013. All Rights Reserved
  7. 7. Convection cells The combination of globalconvection and Earth’srotation sets up a series ofwind patterns calledconvection cells.Rising AirSinking Air= High Pressure= Low Pressure= wind© iTutor. 2000-2013. All Rights Reserved
  8. 8. Coriolis effect The bending of currents of air due to the Earth’srotation is called the Coriolis effect. Due to these effect… Wind bend to the right in thenorthern hemisphere. Wend bend to the left in thesouthern hemisphere.Path without Coriolis effectPath with Coriolis effect© iTutor. 2000-2013. All Rights Reserved
  9. 9. Air and water vapor Three important global wind patterns exist ineach hemisphere: Trade winds Prevailing westerlies Polar easterliesNW ESPolar frontPolar front© iTutor. 2000-2013. All Rights Reserved
  10. 10. Air and water vapor Water in gas form is calledwater vapor. Like a soggy sponge, air reachesa point and can’t hold anymorevapor. The vapor turns back into liquidand form droplets.© iTutor. 2000-2013. All Rights Reserved
  11. 11. Relative Humidity Relative humidity is a measure of how muchwater vapor an air mass contains.Warm Air massCool Air massLarger volumeholds morewater vaporSmall volumeholds smallwater vapor© iTutor. 2000-2013. All Rights Reserved
  12. 12. The EndCall us for moreInformationwww.iTutor.com1-855-694-8886Visit