18.2- Cloud Formation
Condensation <ul><li>Condensation can form dew, fog, or clouds and they all need saturated air to develop. </li></ul>
Adiabatic Temperature Changes <ul><li>Temperature changes that happen even though heat isn’t added or subtracted are calle...
Expansion and Cooling <ul><ul><li>Dry adiabatic rate-  the rate of cooling or heating apples only to unsaturated air. </li...
Processes That Lift Air <ul><li>Clouds form because there is some mechanical process that forces air to rise. </li></ul><u...
Orographic Lifting <ul><li>Mountains acting as barriers to the flow of air, forcing the air to ascend; the air cools adiab...
Frontal Wedging <ul><li>The boundary between two adjoining air masses having contrasting characteristics.  </li></ul>
Convergence <ul><li>Whenever air in the lower atmosphere flows together, lifting occurs. </li></ul>
Stability  <ul><li>If the volume of air was forced to rise, its temperature would drop because of expansion. </li></ul><ul...
Stability and Daily Weather  <ul><li>Clouds with the lifting of unstable air are towering and often generate thunderstorms...
Condensation <ul><li>Condensation happens when water vapor in the air changes to a liquid which may be in the form of dew,...
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18.2[1] cloud formation

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18.2[1] cloud formation

  1. 1. 18.2- Cloud Formation
  2. 2. Condensation <ul><li>Condensation can form dew, fog, or clouds and they all need saturated air to develop. </li></ul>
  3. 3. Adiabatic Temperature Changes <ul><li>Temperature changes that happen even though heat isn’t added or subtracted are called abatic temperature changes. </li></ul><ul><ul><li>When air is allowed to expand it cools, and when it is compressed, it warms. </li></ul></ul>
  4. 4. Expansion and Cooling <ul><ul><li>Dry adiabatic rate- the rate of cooling or heating apples only to unsaturated air. </li></ul></ul><ul><ul><ul><li>If a parcel of air rises high enough, it will eventually cool to its dew point. </li></ul></ul></ul><ul><ul><li>Latent heat works against the adiabatic cooling. </li></ul></ul><ul><ul><li>The slower rate of cooling caused by the addition of latent heat is called the wet adiabatic rate. </li></ul></ul>
  5. 5. Processes That Lift Air <ul><li>Clouds form because there is some mechanical process that forces air to rise. </li></ul><ul><li>Four mechanisms that can cause air to rise are orographic lifting, frontal wedging, convergence, and localized convective lifting. </li></ul>
  6. 6. Orographic Lifting <ul><li>Mountains acting as barriers to the flow of air, forcing the air to ascend; the air cools adiabatically, and clouds and precipitation may result. </li></ul>
  7. 7. Frontal Wedging <ul><li>The boundary between two adjoining air masses having contrasting characteristics. </li></ul>
  8. 8. Convergence <ul><li>Whenever air in the lower atmosphere flows together, lifting occurs. </li></ul>
  9. 9. Stability <ul><li>If the volume of air was forced to rise, its temperature would drop because of expansion. </li></ul><ul><li>Stable air tens to remain in its original position while unstable air tends to rise. </li></ul><ul><li>Air stability is determined by measuring the temperature of the atmosphere at various heights. </li></ul><ul><ul><li>Temperature Inversion- a layer of limited depth in the atmosphere of limited depth where the temperature increases rather then decreases the height. </li></ul></ul>
  10. 10. Stability and Daily Weather <ul><li>Clouds with the lifting of unstable air are towering and often generate thunderstorms and occasionally even a tornadoes. </li></ul>
  11. 11. Condensation <ul><li>Condensation happens when water vapor in the air changes to a liquid which may be in the form of dew, fog, or clouds. </li></ul><ul><li>When condensation occurs in the air above the ground, tiny bits of particulate matter is called condensation nuclei . </li></ul>

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