1. TEST 8: Std. 3, Obj. 2 Review

2. Cloudy – chance of storms
What kind of weather comes with a low pressure system?
Cloudy – chance of storms

3. What instrument measures air pressure?
Barometer

4. What instrument measures relative humidity
What instrument measures relative humidity? (Hint: Our recent lab activity.)
Psychrometer!

5. If the barometer reading falls, what do we know about the weather?
Storm’s a-comin’!

6. What will warm, moist air moving over a mountain range do?
Clouds!

7. What do we call precipitation that falls through freezing air close to the ground?
Sleet!

8. If enough energy is absorbed by liquid water, what happens to the water?
Evaporation = Gas

9. What kind of storms do cold fronts produce?
Short, Violent

10. Large Area, Sometimes Violent
What kind of storms do warm fronts produce?
Large Area, Sometimes Violent

11. When warm air moves into cold air, that is called a . . .
Warm Front

12. When cold air moves into warm air, that is called a . . .
Cold Front

13. *Cold air mass advances *Runs into warm air mass
Describe what happens during a cold front.
*Cold air mass advances
*Runs into warm air mass
*Lifts warm air mass up

14. How do winds in the Northern Hemisphere move in a low pressure system?
Counter-clockwise

15. How do winds in the Northern Hemisphere move in a high pressure system?
Clockwise

16. Warm, Moist Air Cold Air The most severe thunderstorms
are caused by . . .
Cold Air
Warm, Moist Air

17. What determines the type of air mass that forms?
Location!

18. *water temperature changes slowly *this stabilizes the air temperature
What makes areas by the ocean warmer in winter and cooler in summer, compared to inland areas?
Oceans:
*water temperature changes slowly
*this stabilizes the air temperature

19. Temperature Drops Water Condenses
What happens when an air mass moves upward quickly?
Temperature Drops
Water Condenses

20. What does “nimbo-” or “-nimbus” (as in cumulonimbus clouds) mean?
Rain-producing

21. What kind of clouds bring thunderstorms and/or hail?
Cumulonimbus!

22. Why are weather satellites better than ground instruments?
Broad Area

23. Location, Extent, Movement
What information can Doppler radar give us?
Location, Extent, Movement

24. What do meteorologists make from their computer data to help them forecast the weather?
Computer Models

25. What are you measuring when you collect data such as air pressure, humidity, temperature, etc.?
Weather!

26. Watch out – storm’s comin’!
How does Doppler radar save lives?
Watch out – storm’s comin’!

27. Bounces radio waves off precipitation
How does Doppler radar measure snow or rain?
Bounces radio waves
off precipitation

28. What do all the weather stations, world-wide, do with the information they collect?
Share It!

29. High pressure equals . . .
Cold!

30. High pressure equals . . .
Cold air sinking

31. Low pressure equals . . .
Warm!

32. Low pressure equals . . .
Warm air rising

33. *warm, moist air rises fast
How does a hurricane form?
*warm, moist air rises fast
*moisture condenses
*latent heat released

34. Canada’s cold, dry air runs into warm, moist air from Gulf of Mexico
Why do the mid-central United States have more tornadoes?
Canada’s cold, dry air runs into
warm, moist air from Gulf of Mexico
Spring and early summer – Tornado Alley

35. True or False: A tornado travels a predictable path if it touches down.

36. Oceans add water vapor and
Why do hurricanes develop over oceans?
Oceans add water vapor and
energy to an air mass.

37. *air sinks and flows outward
What is an “anticyclone”?
*opposite of cyclone
*air sinks and flows outward
*brings dry weather

38. In the United States, what direction do air masses move
In the United States, what direction do air masses move? (Hint: Same as wind.)
West
East

39. Look at this weather map. What do the “L” and “H” indicate?
Pressure!

40. What do meteorologists use on a weather map to convey information?
Colors!
Symbols!

41. What is this air mass called and which way is it moving?
Cold Front 

42. What is this air mass called and which way is it moving?
Warm Front 

43. What is this air mass called and which way is it moving?
Occluded Front 

44. Dude, it ain’t goin’ nowhere!
What is this air mass called and which way is it moving?
Stationary Front
Dude, it ain’t goin’ nowhere!

45. Temperatures will rise.
What will temperatures in Chicago be like in the next few days?
See the warm front?
Temperatures will rise.