Where the fronts are

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Where the fronts are

  1. 1. Where The Fronts Are
  2. 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. 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. 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. 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. 6. This line
  7. 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. 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. 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. 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. 11. Warmer air Cooler air I’m in warm air now
  12. 12. Warmer air Cooler air Hey it got colder! It must be a cold front
  13. 13. What about the Eastern “Leg”?
  14. 14. Warmer air Cooler air Boy, it’s pretty cool
  15. 15. Warmer air Cooler air Aah! Nice and warm. It must be a warm front
  16. 16. What kind of weather do you get from each?
  17. 17. Cool Air Warm Air
  18. 18. Warm air rises because it is light & fluffy.
  19. 19. Cold Front
  20. 20. A Cumulonimbus Cloud “Thunderhead”
  21. 21. Rain
  22. 22. 20-50 miles Storms are very small, 20-50 miles or so and last only a brief time.
  23. 23. Right now it’s nice and warm Gadzukes! It got cold!
  24. 24. Warm Air Cool Air Frontal interface Warm is light and fluffy and it likes to float!
  25. 25. Warm Air Cool Air
  26. 26. First come the Cirrus Which way is the weather coming from?
  27. 27. It’s pretty cool nowSuch pretty cirrus clouds!
  28. 28. Hmmm, the clouds are getting low The warm front gets closer…
  29. 29. Clouds get lower and thicker
  30. 30. Darn! It’s starting to drizzle.
  31. 31. Lower and thicker then gentle rain for a long time.
  32. 32. It’s much warmer now
  33. 33. Warm Front

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