4-23. When a warm front crosses a mountain range and encounters colder air on the lee side of the mountain, which of the following phenomena may occur? 1. The warm front moves across the top of the cold air as an upper warm front 2. Overrunning 3. Inversions are wiped out 4. Each of the above 4-24. Occluded fronts are classified as which of the following types? 1. Cold only 2. Warm only 3. Cold or warm 4. Cold, warm or cool 4-25. What is the primary difference between a warm and cold occlusion? 1. The temperature of the warm air 2. The temperature of the cold air 3. The temperature of the cool air 4. The location of the associated upper front in relation to the surface front 4-26. Which   of   the   following   occurrences   takes place in the cold-occlusion process? 1. Cold air displaces the warm air to the rear of  a  warm  front  and  then  undercuts  the relatively cooler air in advance of the warm front 2. Cool air displaces the warm air to the rear of a warm front and then rides up over the colder  retreating  air  ahead  of  the  warm front 3. Warm air displaces the cold air in advance of the warm front and rides up over cool air behind the cold front 4. Cold   air   replaces   warm   air   and   then overruns relatively cooler air ahead of the warm front 4-27. How is a cold occlusion designated that crosses the  Rocky  Mountains  and  encounters  deep, cold air over the Plateau or Western Plains? 1. As an occlusion 2. As a cold front 3. As an upper cold front 4. As a warm front 4-28. Where  does  MOST  of  the  precipitation  occur with a cold occlusion? 1. Ahead of the occlusion, if the occlusion is old 2. To    the    rear    of    the    occlusion    in    the occlusion’s initial stages of development 3. Just ahead of the occlusion 4. Just to the rear of the occlusion 4-29. How are the isotherms affected as an occlusion matures? 1. They become more parallel to the occlusion on the cold air side 2. They become more parallel to the occlusion on the warm air side 3. They  become  more  perpendicular  as  they cross the front 4. Warm   and   cold   pockets   form,   and   no isotherms cross the front 4-30. Which of the following situations is conducive to the formation of a warm occlusion? 1. The presence of a cPk air mass in the Gulf of Mexico 2. The  invasion  of  mPk  air  into  the  Great Plains 3. The  presence  of  cpk  air  over  Canada,  a warm  front  along  its  western  periphery, and an approaching mPk air mass 4. The development of a low at the southern tip of the Appalachian Mountains 4-31. Where are the pressure falls associated with a warm occlusion located? 1. In advance of the upper warm front 2. In   advance   of   the   occlusion’s   surface position only 3. In the pressure trough behind the occlusion 4. In advance of the upper cold front and the surface occlusion 4-32. In a warm occlusion, where is the most severe weather located? 1. At the apex during the developmental stage 2. At  the  point  where  the  warm  air  is  at  its highest altitude 3. In the warm sector equatorward of the apex of the occlusion 4. At the northernmost extension of a mature occlusion 21