ASSIGNMENT 4 Textbook Assignment:    “Air Masses and Fronts” (continued); “Atmospheric Phenomena.” Chapters 4 and 5, Pages 4-31 through 5-6. 4-1. What  is  the  average  slope  of  a  slow-moving cold front? 1. 1:50 2. 1:100 3. 1:150 4. 1:300 4-2. Which  of  the  following  indications  is  repre- sentative of the passage of a slow-moving cold front? 1. Wind backs 2. Sharp rise in pressure 3. Marked temperature rise 4. Sharp drop in the dew point 4-3. What is the average range of speed of a slow- moving cold front? 1. 5 to 10 knots 2. 10 to 15 knots 3. 15 to 20 knots 4. 20 to 25 knots 4-4. When the cold air to the rear of a slow-moving cold front is moist and stable, and the warm air that  it  is  displacing  is  also  moist  and  stable, which  of  the  following  weather  conditions  is most likely to occur in the vicinity of the front? 1. Thunderstorms at and ahead of the front 2. Thunderstorms at and behind the front 3. Rapid clearing with the frontal passage 4. Low ceilings of stratus and fog 4-5. Which of the following statements describes a characteristic of slow-moving cold fronts? 1. The    frontal    inversion    is    usually    very evident 2. Isotherms    parallel    the    front    and    are concentrated in the cold air 3. Cloudiness    and    precipitation    normally extend  back  into  the  cold  air  as  far  as  the wind and isotherms parallel the front 4. Each of the above 4-6. The winds that push a slow-moving cold front are  more  parallel  to  the  front  at  lower  levels than aloft. 1. True 2. False 4-7. Where do squall lines develop? 1. In advance of a slow-moving cold front 2. To the rear of a slow-moving cold front 3. In advance of a fast-moving cold front 4. To the rear of a fast-moving cold front 4-8. Which of the following factors determines the type of weather associated with a fast-moving cold front? 1. The moisture content of the cold air only 2. The stability of the cold air only 3. The  moisture  content  and  stability  of  the cold air 4. The  moisture  content  and  stability  of  the warm air 4-9. A fast-moving cold front has an average range of speed of 1. 15 to 20 knots 2. 20 to 25 knots 3. 25 to 30 knots 4. 30 to 35 knots 4-10. Which   of   the   following   indications   is/are associated  with  the  passage  of  a  fast-moving cold front? 1. The dew point changes little if at all 2. The  temperature  changes  little,  if  at  all, until the front is well past 3. Rapid clearing 4. Answers 2 and 3 are both correct 19