Weather Fronts and Storms 3.1 Weather changes as air masses move.
Weather Fronts and Storms <ul><li>The Big Idea:  The interaction of air masses causes changes in weather.  </li></ul><ul><...
Vocabulary <ul><li>air mass-  a large volume of air in which the temperature and humidity are nearly the same in different...
Air masses are large bodies of air.  <ul><li>Air may sit over a large area for many days.  </li></ul><ul><li>It will gradu...
North American Air Masses <ul><li>The first word= formed over water or land  The second word= distance from equator the ai...
North American Air Masses
Fronts and Weather Cold fronts <ul><li>Can move in quickly.  </li></ul><ul><li>Are steeper than other fronts.  </li></ul><...
 
Fronts and Weather Warm fronts <ul><li>Move slower than cold fronts.  </li></ul><ul><li>Warm air moves slowly up and over ...
 
Fronts and Weather Stationary fronts <ul><li>Occur when cold and warm air masses first meet or when a front stops moving. ...
 
The end.... <ul><li>Happy times! </li></ul>
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Ea 3.1 weather fronts and storms

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Ea 3.1 weather fronts and storms

  1. 1. Weather Fronts and Storms 3.1 Weather changes as air masses move.
  2. 2. Weather Fronts and Storms <ul><li>The Big Idea: The interaction of air masses causes changes in weather. </li></ul><ul><li>Key Concept 3.1: Weather changes as air masses move. </li></ul>
  3. 3. Vocabulary <ul><li>air mass- a large volume of air in which the temperature and humidity are nearly the same in different locations at the same altitude </li></ul><ul><li>front- a boundary between air masses </li></ul><ul><li>high-pressure system- air moving clockwise around a high-pressure center often bringing clear skies and calm winds </li></ul><ul><li>low-pressure system- air moving counter-clockwise around a low-pressure center often bringing rainy, stormy weather </li></ul>
  4. 4. Air masses are large bodies of air. <ul><li>Air may sit over a large area for many days. </li></ul><ul><li>It will gradually take on the characteristics of the ground or water below. </li></ul><ul><li>As an air mass moves, it brings its moisture and temperature with it. </li></ul><ul><li>What would the air mass over this area be like? </li></ul>
  5. 5. North American Air Masses <ul><li>The first word= formed over water or land The second word= distance from equator the air mass formed </li></ul><ul><li>Continental air masses: form over land; air becomes dry, loses moisture to land below. </li></ul><ul><li>Maritime air masses: form over water; air becomes moist as it gains moisture from water below. </li></ul><ul><li>Tropical air mass: form near equator; warm air </li></ul><ul><li>Polar air mass: form far from equator; cool air </li></ul>
  6. 6. North American Air Masses
  7. 7. Fronts and Weather Cold fronts <ul><li>Can move in quickly. </li></ul><ul><li>Are steeper than other fronts. </li></ul><ul><li>As cold, dense air moves forward it pushes warm air upward. </li></ul><ul><li>Water vapor condenses as the air rises. </li></ul><ul><li>Tall cumulonimbus clouds, precipitation, storms. </li></ul>
  8. 9. Fronts and Weather Warm fronts <ul><li>Move slower than cold fronts. </li></ul><ul><li>Warm air moves slowly up and over a mass of denser, colder air. </li></ul><ul><li>Moisture condenses all along the sloping front, making cloud-covered skies. </li></ul><ul><li>Cirrus then stratus then low stratus </li></ul><ul><li>May bring hours of steady rain or snow. </li></ul>
  9. 11. Fronts and Weather Stationary fronts <ul><li>Occur when cold and warm air masses first meet or when a front stops moving. </li></ul><ul><li>The air masses push against each other until one advances. </li></ul><ul><li>Could become warm or cold front. </li></ul><ul><li>Produces cloudy skies for days at a time. </li></ul>
  10. 13. The end.... <ul><li>Happy times! </li></ul>

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