11-9. When the dewpoint is raised, which type 

 of fog is formed? 



1. Sea fog 



2. Steam fog 



3. Land advection fog 



4. Radiation fog 



11-10. What processes are taking place when an 

 upslope fog is forming? 



1. Air is rising, expanding, and cooling 



2. Air is rising, contracting, and cool- 11-16. 

 ing 



3. Air is descending, expanding, and 

 cooling 



4. Air is descending and being warmed by 

 contraction 



11-11. Frontal fogs are formed as the result of 11-17. 

 the 



1. condensation of water vapor from the 

 surrounding air 



2. transportation of warm air over a 

 colder land or water surface 



3. radiational cooling of the earth's 



surface 11-18. 



4. evaporation of falling rain 



11-12. Which type of fog is considered to be the 

 most dangerous? 



1. Cold-front fog 



2. Upslope fog 



3. Sea fog 11-19. 



4. Warm-front fog 



Learning Objective: Identify hydro- 

 meteors that are deposited on objects 

 at, or near, the ground. 



Learning Objective: Recognize the 

 weather conditions associated with 

 most tornado activity, tornado 

 forecast possibilities, and the 

 incidence of tornado activity as 

 related to the time of year. 



Generally, what is the horizontal speed 

 of a tornado? 



1. 150 to 300 mph 



2. 50 to 100 mph 



3. 25 to 40 mph 



4. 5 to 15 mph 



The season for maximum tornado occurrence 

 in the United States is late 



1. summer and early fall 



2. fall and early winter 



3. spring and early summer 



4. winter and early spring 



Where is a tornado most likely to be 

 developed? 



1. Along a warm front 



2. Behind a squall line 



3. In advance of a cold front 



4. In the trough of an occluded front 



Which of the following conditions would 

 NOT be associated with tornado activity? 



1. A rapidly moving cold front 



2. A dry air mass superimposed on a 

 moist air mass 



3. Pronounced change of wind velocity 

 with distance 



4. A cold air mass superimposed on a 

 dry air mass 



In items 11-13 through 11-15, select from column 

 B the hydrometeor that is applicable to each 

 description in column A. 



Learning Objective: Recognize causes 

 and effects of lithometeors, photo- 

 meteors, and electrometeors. 



A. Description 



11-13. Crystalline appearing 

 ice deposited directly 

 on objects at, or near, 

 the ground 



11-14. Solid equivalent of 

 waterdrops deposited 

 on objects at, or near, 

 the ground resulting 

 from condensation of 

 water vapor from clear 

 air 



11-15. Dew which is frozen 

 after it forms 



B. 



Hydrometeors 



1. Dew 



White dew 



3. Frost 



11-20. Which lithometeor causes the sun to 



appear red at sunrise and sunset and to 

 have an orange glow during the daytime? 



1. Haze 



2. Dust 



3. Sand 



4 . Smoke 



11-21. All but which of the following photo- 

 meteors indirectly affect weather through 

 their relationship to clouds? 



1. Halos 



2. Coronas 



3. Auroras 



4. Rainbows 



65 



