单项选择题
A.in the southeast quadrant of the storm
B.directly behind the storm center
C.forward and to the right of its course
D.behind and to the left of its course
单项选择题 In the Northern Hemisphere，gusty winds shifting clockwise，a rapid drop in temperature，thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies，indicate the passage of a(n)（） .
单项选择题 In the Northern Hemisphere，an area of counterclockwise wind circulation surrounded by higher pressure is a（）.
单项选择题 In many areas atoll clouds (clouds of vertical development) are produced over small islands. These are the result of（）.