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Where the fronts are

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  • 1. Where The Fronts Are
  • 2. • A front is the leading edge of an air mass. • If it is the front of a cooler air mass, it will be a COLD FRONT. • If it is the front of a warmer air mass, it will be a WARM FRONT.
  • 3. How to tell where a front belongs on a map. • A front will be located where the temperature changes rapidly in a short distance. • Isotherms will be close together.
  • 4. Warmer air Cooler Air 50°F 30°F 35°F 40°F 40°F 45°F 45°F 50°F 30°F 35°F 25°F
  • 5. Now that we know WHERE the fronts are, how do we know what KIND they are? • It depends on which direction the line you just drew is moving…
  • 6. This line
  • 7. Now that we know WHERE the fronts are, how do we know what KIND they are? • It depends on which direction the line you just drew is moving… • If colder air is coming in, it is a cold front. • If warmer air is coming in, it is a warm front.
  • 8. So how do I know which way the front is moving? • Look at the winds on both sides of the front. • On one side, the winds will be “pushing” the front. • On the other side, the winds will be retreating from the front.
  • 9. Pop Quiz! • A pressure center (Low or High) is located at the “corner” of these two fronts. • What kind of pressure center is it?
  • 10. Almost There! How do you know if it is a cold or warm front? • Put yourself in front of the front. • Ask yourself: “Self, what kind of air am I in now: warm or cold?” • Then ask yourself: “Self, what kind of air will I be in after the front passes?” • If it got cooler, it is a cold front. • If it got warmer, it is a warm front.
  • 11. Warmer air Cooler air I’m in warm air now
  • 12. Warmer air Cooler air Hey it got colder! It must be a cold front
  • 13. What about the Eastern “Leg”?
  • 14. Warmer air Cooler air Boy, it’s pretty cool
  • 15. Warmer air Cooler air Aah! Nice and warm. It must be a warm front
  • 16. What kind of weather do you get from each?
  • 17. Cool Air Warm Air
  • 18. Warm air rises because it is light & fluffy.
  • 19. Cold Front
  • 20. A Cumulonimbus Cloud “Thunderhead”
  • 21. Rain
  • 22. 20-50 miles Storms are very small, 20-50 miles or so and last only a brief time.
  • 23. Right now it’s nice and warm Gadzukes! It got cold!
  • 24. Warm Air Cool Air Frontal interface Warm is light and fluffy and it likes to float!
  • 25. Warm Air Cool Air
  • 26. First come the Cirrus Which way is the weather coming from?
  • 27. It’s pretty cool nowSuch pretty cirrus clouds!
  • 28. Hmmm, the clouds are getting low The warm front gets closer…
  • 29. Clouds get lower and thicker
  • 30. Darn! It’s starting to drizzle.
  • 31. Lower and thicker then gentle rain for a long time.
  • 32. It’s much warmer now
  • 33. Warm Front