4. Air masses are classified based on their and amount of

5. Air masses get their characteristics based on

6. The abbreviations used to classify air masses use the following letters: c, m, T, P, and A. For each letter, describe its property: WordMeans c m T P A continentaldry maritimemoist Tropicalwarm Polarcold Arcticvery cold

7. warm and moistcold and dry

15. http://www.classzone.com/books/earth_science/terc/content/visualizations/es2001/es2001page01.cfm?chapter_no=20

16. mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

17. mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

18. mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

19. mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

20. mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

24. Pressure Systems, Fronts, and Weather Complete the following notes from your book. You may work with a partner. We will come back and go over these note and make sure you have written them correctly.

25. Fronts Warm front

26. Fronts Warm fronts –Form when warm air moves into an area formerly covered by cold air –Shown on a weather map by a red line with semi-circles pointing toward the colder air Warmer air Colder air

27. Fronts Warm fronts –As the warmer, less dense air rises, it cools  This produces clouds and frequent precipitation –Warm fronts move slowly, so the precipitation is light-to-moderate over a large area for a long period of time

28. Fronts Cold Front

29. Fronts Cold fronts –Form when cold, dense air moves into an area formerly occupied by warmer air –Shown on a weather map by a blue line with triangles pointing toward the warmer air Colder air Warmer air

30. Fronts Cold Fronts –Move much more quickly than warm fronts –Associated with heavy precipitation that is short-lived

31. Fronts Stationary Fronts –Form when the flow of air is neither toward the cold air mass, nor toward the warm air mass –The front does not move –Shown by blue triangles on one side and red semicircles on the other –Gentle to moderate precipitation

32. Fronts Occluded Front –Forms when a cold front overtakes a warm front –Complex weather patterns –Precipitation is common on both sides of an occluded front

33. Pressure Systems Low Pressure –Air moves in a counter-clockwise direction –Made of rising warm air that flows inward –Associated with clouds and precipitation High Pressure –Air moves in a clockwise direction –Made of sinking cold air that flows outward –Associated with fair weather

35. F

36. 76 55.. 138 -30\ Temperature Dewpoint Wind Direction & Speed Barometric Pressure Current Weather Cloud Cover Barometric Trend

37. Barometric Pressure 138 1013.8 Add a decimal between the last two digits 13.8 Add a 9 or 10 in front to fit on the scale (ranges from 950.0 to 1050.0)