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Weather Patterns

Weather Patterns. What Causes Wind?. Air is a fluid – it moves easily Movement of air caused by changing air pressure Wind is movement of air from h igh pressure to low pressure. Air Movement. Global Winds. Types of Air Masses.

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Weather Patterns

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  1. Weather Patterns

  2. What Causes Wind? • Air is a fluid – it moves easily • Movement of air caused by changing air pressure • Wind is movement of air from high pressure to low pressure

  3. Air Movement

  4. Global Winds

  5. Types of Air Masses • An air mass forms when a large amount of air stays in the same place over an area • Continental air masses form over land and are dry • Maritime air masses form over water and are moist • Polar air masses are cold • Tropical air masses are warm

  6. Types of Air Masses There 4 air masses affecting North America cT- continental tropical cP – continental polar mT – maritime tropical mP – maritime polar

  7. Fronts • Air masses move and bump into each other • Fronts appear at the edges of two air masses where they are colliding with each other

  8. Fronts There are 4 types of fronts: Cold fronts Stationary fronts Warm fronts Occluded fronts

  9. Cold front • Occurs when a cold air mass overtakes a warm air mass • Cold air forces warm air to rise quickly • Resulting in strong winds, thunderstorms, and large amounts of precipitation

  10. Cold fronts usually bring cooler weather, clearing skies, and a sharp change in wind direction.

  11. http://www.suu.edu/faculty/colberg/hazards/weather/05_cnWfronts.htmlhttp://www.suu.edu/faculty/colberg/hazards/weather/05_cnWfronts.html

  12. Cold Front Diagrams

  13. Warm Fronts • Occurs when a warm air mass overtakes a cold air mass • Warm air slowly rises over the cold air • Starts with steady rain (8-12 hours) but eventually clears when temperatures rise • Warm fronts tend to move slowly are far less violent then cold fronts

  14. After warm front passes, weather becomes warm and humid, but generally clear

  15. Warm Front

  16. Warm Front Diagrams

  17. Stationary Front • When neither air mass can move the other • Similar to warm fronts and can remain in same place days • Light wind and precipitation occur across entire region affected

  18. Occluded front • When a warm air mass gets trapped between two cold air masses • Strong winds and heavy precipitation occur

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