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Understanding Weather Patterns: Air Masses, Pressure Systems, Fronts

Learn about air masses, pressure systems, and fronts in weather patterns. Understand how air masses affect daily weather, pressure systems determine atmospheric conditions, and fronts bring about storms and precipitation. Explore warm fronts, cold fronts, occluded fronts, and stationary fronts to grasp the different weather phenomena that occur at their boundaries.

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Understanding Weather Patterns: Air Masses, Pressure Systems, Fronts

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  1. Weather PatternsChapter 15-2

  2. I. Changes in Weather A. Air Masses 1. An air mass is … … a large body of air that has the same properties as the surface it develops over. 2. For example … a. Dry air mass over land Moist air mass over water b. Warm air mass over the tropics Cold air mass over the poles 3. Daily weather is due to … … movement of air masses.

  3. B. Pressure Systems 1. Three things that determine atmospheric pressure are … -Temperature -Density -The amount of water vapor 2. High pressure is the result of … Descending (Sinking) Air 3. High pressure brings good weather because … Sinking air makes it difficult for air to rise and clouds to form.

  4. C. Fronts 1. Low pressure systems form … … along the boundaries of air masses. 2. A Front is … … the boundary between two different air masses. 3. You would expect to see … storms and precipitation as a front passes overhead. 4. Air movement as fronts collide 5. The winds rotate counterclockwise as a result of … the coriolis effect.

  5. D. Four types of fronts 1. Warm Front a. A Warm front occurs when … … less dense, warm air slides over a departing cold air mass. b. The precipitation associated with a warm front … … would be a wide band of precipitation. c. The clouds you would expected to see would be …cirrus.

  6. 2. Cold Front a. In a cold front … … a colder air mass pushes under a warm air mass and forces warm air up on a steep curve. b. A cold front produces … … a narrow band of violent storms. c. The type of clouds it produces would be … … cumulus and cumulonimbus.

  7. 3. Occluded Front a. An occluded front results from … … two cool air masses crashing together and forcing warm air between them to rise. b. You would expect to see … … strong winds and heavy precipitation.

  8. 4. Stationary Front a. A stationary front occurs when … … pressure differences cause warm and cold fronts to stop moving. b. In a stationary front you expect to see … … light winds and wide spread precipitation across the frontal region.

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