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Fronts and Lows: Understanding Air Masses and Weather Changes

Learn about the different types of fronts and air masses that impact weather conditions, including cold fronts, warm fronts, occluded fronts, and stationary fronts. Discover how these fronts interact with low-pressure systems and affect temperature, wind direction, humidity, and precipitation.

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Fronts and Lows: Understanding Air Masses and Weather Changes

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  1. CHAPTER 20WEATHER

  2. 20.2 Fronts and Lows

  3. 12/4 DAILY QUIZ • 1. What is an air mass? • 2. Give the characteristics of each air mass below • cA • mP • cT • cP • mT

  4. 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

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

  6. FRONT

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

  8. COLD FRONT Warm Air Cold

  9. 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

  10. WARM FRONT Warm Air Cold Air Vis 2002

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

  12. 4. Stationary Front • Front is not moving. • Warm air still rises above cold air, bringing clouds and precipitation. • Can lead to flooding.

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

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

  15. Upper Air Flow Upper Air Flow steers the Low along

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

  17. EARTH SCIENCE SATURDAY STUDY GROUP 9am to 12noon

  18. LAST PORTFOLIO DECEMBER 17, 2012

  19. TITLE: Name: BIG IDEA THINGS I HAVE TO KNOW TO UNDERSTAND THE BIG IDEA OTHER THINGS I COULD ALSO KNOW

  20. 11/16 TODAY… Stamp Homework Tonight’s Homework FINISH WORK STARTED IN CLASS Read Section 19-1, 19-2 Answer Section Assessment 19-2 & 19-2 Answer Worksheets 19-1 & 19-2 Complete Chapter 19.1.19.2 Powerpoint Notes Daily Quiz Worksheet 19-4 and 19-4

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