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The Wonderful World of Weather

The Wonderful World of Weather. Air Masses & Fronts. Essential Questions. What is an air mass? What is the difference between high and low pressure? What is a front and what are the three types of fronts? How can I read a weather map?. Air Masses.

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The Wonderful World of Weather

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  1. The Wonderful World of Weather Air Masses & Fronts

  2. Essential Questions • What is an air mass? • What is the difference between high and low pressure? • What is a front and what are the three types of fronts? • How can I read a weather map?

  3. Air Masses • An AIR MASS is a large body of air that has the same temperature and humidity throughout. • Air masses can either be warm or cold.

  4. Air Masses There are two types of air masses: 1. Continental Polar air masses 2. Maritime Tropical air masses These air masses bring dry and cold air. These air masses bring humid and warm air.

  5. High and Low Pressure Areas • High pressure causes air to sink • Usually results in several days of clear sunny skies • Air rises in low pressure areas and forms water droplets • Usually results in rain and storms

  6. Weather Maps: Pressure & Temperature Where are the areas of High and Low Pressure located?

  7. Fronts A FRONT is the border where two air masses meet. Most weather changes occur along a front. • Fronts extend both vertically and horizontally in the atmosphere

  8. Fronts: Three Types of Fronts 1.Cold Front: The zone where cold air is replacing warmer air • In U.S., cold fronts usually move from northwest to southeast • Air gets drier after a cold front moves through

  9. Fronts: Five Types of Fronts 2.Warm Front: The zone where warm air is replacing colder air • In U.S., warm fronts usually move from southwest to northeast • Air gets more humid after a warm front moves through, often causing many hours of precipitation

  10. Fronts: Five Types of Fronts 3.Stationary Front: When either a cold or warm front stops moving • When the front starts moving again it returns to either being acoldor warm front

  11. Weather Maps: Doppler Radar Maps Find the Stationary Front Find a High Pressure system Find a Cold Front

  12. Let’s Review • Low pressure is usually associated with what type of weather? • A. Sunny and fair • B. Cloudy with rain or snow • C. Clear and cold • D. Partly cloudy with a light breeze B.

  13. Let’s Review • Which of these is a common effect of a warm front? • A. cold, clear weather • B. many hours of rain • C. strong, blowing winds • D. violent thunderstorms B.

  14. Let’s Review • What kind of air mass causes hot, humid weather? • A. Warm Front • B. Continental Polar • C. Cold Front • D. Maritime Tropical D.

  15. Let’s Review • A weather map indicated that Chicago, Illinois is in a high pressure system. This means the weather in Chicago is most likely… • A. rainy • B. thunderstorms • C. sunny • D. cloudy C.

  16. Let’s Review • Which of these is liquid precipitation? • A. rain • B. dew • C. fog • D. climate A.

  17. Let’s ReviewEXTENDED RESPONSE • Suppose it’s sunset on a warm, humid day. After dark, the temperature is predicted to drop. PART A- How does air temperature relate to the amount of water vapor in the air? PART B- What will happen to the water vapor in the air if the temperature drops as predicted?

  18. Let’s Review C.

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