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Air Masses, Fronts, and Lows in Weather Systems

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Learn about air masses, fronts, and low-pressure systems in meteorology, including characteristics of different air masses and types of fronts. Discover how fronts influence temperature, wind direction, humidity, and precipitation in weather patterns.

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Air Masses, Fronts, and Lows in Weather Systems

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  1. Warm Up Chapter 20 • 1. What is an air mass? • 2. Give the characteristics of each air mass below • cA • mP • cT • cP • mT

  2. 20.2: Fronts and Lows • Section 20.2 - Agenda • What is a Front? • Types of Fronts • Warm • Cold • Stationary • Occluded • Life cycle of a Mid-Latitude Low

  3. What is a Front? • The boundary that separates different air masses. • Usually bring: • Changes in Temperature • Changes in Wind Direction • Changes in Humidity • Precipitation

  4. Warm Air Cold

  5. 1. Cold Front • Advancing Cold Air • Forces Warm air up at a Steep slope • Usually a narrow band of precipitation • Cumulonimbus Clouds

  6. 2. Warm Front • Advancing Warm Air • Warm air rides over cold air at a low slope • Usually a wide band of precipitation • Brings thinner, layered clouds

  7. Warm Air Cold Air Vis 2002

  8. 3. Occluded Front • Cold Front catches up to Warm Front since cold fronts move twice as fast. • Warm air is squeezed up, forming clouds.

  9. 4. Stationary Front • Front is Not Moving. • Warm air still rises above cold air, bringing clouds and precipitation. • Can lead to flooding.

  10. END

  11. Life Cycle of a Mid-Latitude Low • Fronts are usually connected to Low Pressure systems. • As the Low spins, the fronts move and Cold front catches up to Warm.

  12. Takes 12 to 24 hours to get to stage 3.

  13. Upper Air Flow • Upper • Air Flow • steers • the • Low • along

  14. Weather associated with Pressure Systems As a Low moves near, the weather will change. A B C

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