viserfly

Questions for AIR MASSES

Answer the following questions

1. Which of the following is typical for the passage of a cold front in the summer ?
2. In which of the following regions does polar maritime air originate?
3. The main factor which contributes to the formation of very low clouds ahead of a warm front is the
4. On an aerodrome, when a warm front is approaching
5. Which of the following zones is most likely to encounter little or no precipitation?
6. In a polar front depression, an occlusion is called a warm occlusion when the cold air
7. Where does polar continental air originate?
8. A squall line usually is most likely to be encountered
9. What is encountered during the summer, over land, in the centre of a cold air pool?
10. What type of precipitation would you expect at an active unstable cold front?
11. How do you recognize a cold air pool?
12. How are the air masses distributed in a cold occlusion ?
13. What are the typical differences between the temperature and humidity between an air mass with its origin in the Azores and an air mass with its origin over northern Russia?
14. In which main direction does a polar front depression move?
15. What will be the effect on the reading of an altimeter of an aircraft parked on the ground shortly before an active cold front passes?
16. What will be the effect on the reading of an altimeter of an aircraft parked on the ground during the period following the passage of an active cold front?
17. What characterizes a stationary front?
18. A frontal depression passes through the airport. What form of precipitation do you expect?
19. What will be the effect on the reading of an altimeter of an aircraft parked on the ground as an active cold front is passing?
20. What is the surface visibility most likely to be, in a warm sector of tropical maritime air, during the summer?
21. When do cold occlusions occur most frequently in Europe?
22. The polar front is the boundary between
23. At the approach of a warm front (northern hemisphere) the wind direction changes from the surface up to the tropopause. The effect of this change is that the wind
24. Thunderstorms in exceptional circumstances can occur in a warm front if
25. In which approximate direction does the centre of a frontal depression move?
26. After passing at right angles through a very active cold front in the direction of the cold air, what will you encounter, in the northern hemisphere immediately after a marked change in temperature?
27. What cloud formation is most likely to occur at low levels when a warm air mass overrides a cold air mass?
28. What is the relative movement of the two air masses along a cold front?
29. Where is the coldest air to be found, in an occlusion with cold front characteristics?
30. Frontal depressions can be assumed to move in the direction of the 2000 feet wind
31. What types of cloud will you meet flying towards a warm front?
32. What type of front / occlusion usually moves the fastest?
33. Which of the following conditions are you most likely to encounter when approaching an active warm front at medium to low level ?
34. Thunderstorms can occur on a warm front if the
35. How do air masses move at a warm front?
36. Read this description: “After such a fine day, the ring around the moon was a bad sign yesterday evening for the weather today. And, sure enough, it is pouring down outside. The clouds are making an oppressively low ceiling of uniform grey; but at least it has become a little bit warmer.” Which of these weather phenomena is being described?
37. Which of the following statements concerning the core of a polar front jet stream is correct?
38. The approximate inclined plane of a warm front is
39. In which air mass are extremely low temperatures encountered?
40. What cloud cover is typical for a wide warm sector of a polar front depression over Central Europe in the summer ?
41. During a cross-country flight at FL 50, you observe the following sequence of clouds: Nimbostratus, Altostratus, Cirrostratus, Cirrus. Which of the following are you most likely to encounter?
42. Which of the following describes a warm occlusion?