6-47. Which  of  the  following  areas  of  the  United States   is   favorable   for   the   development   of storm (low-pressure) centers? 1. Ohio Valley 2. Tennessee Valley 3. Central Idaho 4. Great Plains 6-48. Which  of  the  following  regions  of  the  United States  has  a  cold,  dry  climate  in  winter  and  a warm, dry climate in summer? 1. Central Plains 2. Intermountain West Central 3. Southwest Pacific Coast 4. Southeast and Gulf States 6-49. The  chief  flight  hazard  in  the  southwestern desert and mountain area of the United States is 1. high level turbulence 2. spring and summer thunderstorms 3. haze 4. dust devils 6-50. Tornadoes are a climatic feature of which of the following areas of the United States? 1. Central Plains 2. Southeast United States 3. Intermountain west central area 4. Southwest Pacific coast area 6-51. Why is the southeast and Gulf states area of the United  States  an  especially  difficult  area  for making forecasts? 1. Stagnating  frontal  systems,  fog,  and  Gulf stratus 2. Air-mass thunderstorms 3. Rapidly moving squall lines 4. Various   combinations   of   all   the   above reasons 6-52. The influx of maritime air into western Europe results in 1. low-temperature extremes 2. infrequent precipitation 3. high humidity 4. mostly clear skies 6-53. Which    of    the    following    European    areas experiences  the  least  amount  of  change  in  its temperature   extremes   between   summer   and winter? 1. European Atlantic coast 2. The Rhine Valley 3. Eastern Europe 4. The northern Alpine region 6-54. The Asian continent is dominated by 1. high pressure in winter and low pressure in summer 2. low pressure in winter and high pressure in summer 3. low pressure year round 4. high pressure year round 6-55. If   a   relatively   dry   excursion   into   northeast South America is planned, which month would be most suitable? 1. January 2. June 3. October 4. November 6-56. Southern Chile experiences a climate similar to that  experienced  by  what  area  of  the  United States? 1. Northwest coast 2. Southwest coast 3. Northeast coast 4. Southeast coast 6-57. Why do the climatic zones of Africa lack sharp distinction? 1. Africa is an island continent 2. There are no prominent mountain ranges in Africa 3. In  Africa,  the  zones  are  controlled  by  the ITCZ 4. Africa  is  under  the  influence  of  only  one air mass 6-58. Which of the following climatic elements is the most important in Africa? 1. Temperature 2. Wind 3. Precipitation 4. Cloud cover 35