CHAPTER 10 WEATHER SYSTEMS OF MIDDLE LATITUDES MULTIPLE CHOICE QUESTIONS 1. In equal volumes, which one of the following air masses exerts the highest surface air pressure? a. cp *b. A c. mp d. ct e. mt 2. In summer, at the same pressure, maritime tropical air is continental tropical air. a. more dense than b. as dense as *c. less dense than 3. A source region for continental tropical air is a. northern Canada. *b. the American Southwest. c. the Gulf of Mexico. d. the North Atlantic. 4. Cold and humid air: a. A *b. mp c. mt d. cp e. ct 5. At the same pressure, which one of the following air masses is least dense? *a. maritime tropical b. arctic c. maritime polar d. continental tropical e. continental polar 6. At the same pressure, which one of the following air masses is most dense in winter? a. maritime tropical *b. arctic c. maritime polar
d. continental tropical e. continental polar 7. A(n) air mass has greatest temperature change between winter and summer. a. maritime tropical *b. continental polar c. maritime polar d. equatorial 8. Usually air mass modification is most rapid when a. continental polar air moves over a frozen lake. b. continental polar air travels over a snow-covered ground. *c. continental polar air moves over bare ground. d. maritime tropical air moves over bare ground. 9. In winter, maritime polar air is continental polar air. a. colder than *b. warmer than c. about the same temperature as d. more humid than 10. A front is a narrow zone of transition between air masses that contrast in a. temperature. b. vapor pressure. c. density. *d. Any of these is correct. 11. As a warm front approaches, clouds appear in which one of the following sequences? *a. cirrus, altostratus, stratus b. stratus, altostratus, cirrus c. cumulus, cumulonimbus, cirrus d. cumulonimbus, cumulus, nimbostratus e. nimbostratus, cirrocumulus, cirrus 12. A cirrus cloud indicates air advection aloft. *a. warm b. cold 13. The cloud and precipitation shield associated with a cold front typically is the cloud and precipitation shield associated with a warm front. a. wider than *b. narrower than c. the same width as 14. A type of cloud associated with a fast-moving, well-defined cold front:
a. cirrus b. stratus *c. cumulonimbus d. cirrostratus 15. Warm fronts typically travel cold fronts. a. faster than *b. slower than c. at the same speed as 16. The type of front formed when the leading edge of cold air merges with a warm front is known as a. a cold front. b. a warm front. c. a stationary front. *d. an occluded front. 17. An occluded front forms a. during the early stages in the life cycle of a wave cyclone. b. just as an extra-tropical cyclone approaches maturity. *c. late in the life cycle of an extra-tropical cyclone. d. near the center of an anticyclone. 18. The most common type of occlusion in the Great Lakes region is the a. warm-type occlusion. b. Cape Hatteras occlusion. *c. cold-type occlusion. d. Alberta-type occlusion. e. Panhandle hook occlusion. 19. Surface air pressure drops when horizontal divergence aloft horizontal convergence at the surface. a. balances *b. is greater than c. is less than 20. In a mature extra-tropical cyclone, fog and drizzle are most likely to develop a. to the northwest of the low center. b. in the warm air behind the warm front. *c. in the cold air just ahead of the surface warm front. d. in the warm air just ahead of the surface cold front.
21. If a weather station reports a wind shift from northeast to north and then northwest and a steady rain turning to snow flurries, the low center is most likely moving a. from west to east, north of the station. b. from northeast to southwest, north of the station. *c. from southwest to northeast, east of the station. d. from southwest to northeast, north of the station. 22. Precipitation tends to be steady and persistent in the sector of a mature extra-tropical cyclone. *a. northeast b. northwest c. southeast d. southwest 23. The northwest sector of a mature extra-tropical cyclone is usually the. *a. coldest b. warmest 24. The warmest sector of a mature extra-tropical cyclone is usually of the cyclone center. a. northeast b. northwest *c. southeast d. southwest 25. The specific track taken by an extra-tropical cyclone depends on *a. the pattern of upper-level westerlies in which the storm is embedded. b. the direction of the surface winds. 26. What is the surface wind direction in the northwest sector of a mature extra-tropical cyclone? a. southeast b. east c. south *d. northwest e. southwest 27. Major winter storms that most directly affect central Indiana follow the cyclone track. a. Alberta *b. Colorado c. Atlantic coast d. Gulf e. Cape Hatteras 28. Extra-tropical cyclones that occur with the greatest frequency over North America:
a. Colorado b. South Pacific c. Panhandle d. East Gulf *e. Alberta 29. Viewed from above, the surface wind circulation about an Alberta-type cyclone is a. clockwise and outward. b. clockwise and inward. c. counterclockwise and outward. *d. counterclockwise and inward. 30. If the surface wind backs from northeast to north, Boston usually experiences *a. cold air advection. b. warm air advection. c. snow changing to rain. d. falling air pressure. e. hail. 31. If the surface wind veers from east to southeast to south, Baltimore usually experiences a. cold air advection. *b. warm air advection. c. rain changing to snow. d. rising air pressure. e. falling temperatures. 32. A surface wind that backs with time indicates that you are situated on the side of the track of an extra-tropical cyclone. *a. cold b. warm 33. air advection takes place to the west of a ridge and to the east of a trough. a. Cold *b. Warm 34. In the track of an extra-tropical cyclone, the area to the right of the system s forward motion is a. relatively cold *b. relatively warm 35. Contrasting air masses are brought together to form fronts by the surface winds about centers of pressure. *a. low b. high
36. In the southwestern United States, heat (thermal) lows generally *a. remain stationary. b. drift slowly westward. c. are very cold. d. track toward New England. e. move southeastward. 37. An intense extra-tropical cyclone tracks up the Mississippi River Valley and passes well to the west of Chicago. As the cold front sweeps through Chicago, the wind shifts from the south to the a. southeast. *b. southwest. 38. A Siberian high is an example of a anticyclone. *a. cold-core b. warm-core 39. At the center of a polar high, the horizontal pressure gradient is and winds are light or calm. a. strong *b. weak 40. Nocturnal radiational cooling is most intense *a. at the center of an anticyclone. b. to the east of the center of a high. c. to the west of the center of a high. d. to the south of the center of a high. e. to the north of the center of a high. 41. When land and water are exposed to the same intensity of solar radiation, the water warms the land. a. more than *b. less than c. about the same as 42. At night, radiational cooling chills a land surface an adjacent water surface. a. less than *b. more than c. about the same as 43. A sea breeze dies down near a. sunrise. b. mid-afternoon. *c. sunset. 44. A land breeze is generally than a sea breeze.
a. stronger *b. weaker 45. The time of year when a lake breeze is most likely to develop along the Lake Michigan shoreline is a. February. *b. June. c. late autumn. d. December. e. November. 46. A mountain breeze blows a. upslope at night. b. upslope during the day. *c. downslope at night. d. downslope during the day. 47. Chinook winds a. warm at the moist adiabatic rate. b. flow downhill under the influence of gravity. c. occur only on the windward slopes of a mountain range. d. All of the above are correct. * 48. As a chinook wind is drawn down the leeward slopes of a mountain range, a. the air temperature rises. b. the saturation vapor pressure increases. c. the relative humidity decreases. *d. All of the above are correct. 49. The katabatic wind flows *a. downhill b. uphill 50. A dust devil a. may resemble a small tornado. b. is not linked to a cloud. c. typically causes little or no property damage. *d. All of these are correct.