WEATHER HAPPENINGS AND CAUSES 



47 



REFERENCES FOR FURTHER STUDY 

 Texts 



Caldwell and Curtis, Science for Today, Chap. 13 



Clement, Collister, and Thurston, Our Surroundings, Chap. 



9 

 Hunter and Whitman, Science in Our World of Progress, pp. 



70-75 

 Lake, Harley, and Welton, Exploring the World of Science, 



Chap. 10 

 Pieper and Beauchamp, Everyday Problems in Science, Unit 



3 



Powers, Neuner, and Bruner, This Changing World, Unit 2 

 Skilling, Tours through the World of Science, Tour 3 

 Van Buskirk and Smith, The Science of Everyday Life, Chap. 



6 



Watkins and Bedell, General Science for Today, Chap. 3 

 Webb and Beauchamp, Science by Observation and Experi- 

 ment, Unit 7 (part) 

 Wood and Carpenter, Our Environment: How We Adapt 



Ourselves to It, Unit 2 



Special references 



Barber, First Course in General Science 



Jameson, Practical Hints for Amateur Weather Forecasters 



Jameson, The Thermometer and Its Family Tree 



WHAT YOU SHOULD AIM TO ACQUIRE FROM 

 THIS STUDY 



1. Something of the weather lore and signs of your 

 community. 



2. How to read thermometers and how they are 

 used in foretelling weather. 



3. The use of barometers in foretelling weather. 



4. How relative humidity is measured and its im- 

 portance in weather forecasting. 



5. How the weather map is read and used. 



6. How to foretell weather in an elementary way 

 by use of the knowledge gained from this study. 



TOPIC 5. INTERESTING WEATHER 



SUGGESTED PROBLEMS AND QUESTIONS 



1. What paths do storm areas take across North 

 America? 



2. What causes thunderstorms? 



3. What is a tornado? 



4. What is a hurricane? 



SUGGESTIONS AND HELPS FOR STUDY 



1. The answers to the following questions will be 

 found helpful in solving the problems. 



a. Problem 2 

 What type of cloud usually develops into a storm? 



TEST OF MASTERY OF THE TOPIC 



In your notebook complete the statements, answer the 

 questions, and comply with the instructions. 



1. The principle upon which the thermometer is based is 

 (repulsion, expansion) . 



2. On the Fahrenheit temperature scale there are 



degrees between the freezing and boiling points of water. 



3. On the centigrade scale water boils at degrees 



and freezes at degrees. 



4. Explain the value of the thermometer in forecasting 

 weather. 



5. Forecast the probable weather for the following condi- 

 tions, giving reasons in each case. 



a. A suddenly falling barometer with a wind blowing 

 from the northeast. 



b. A sudden rise in the barometer with the wind blowing 

 from the northwest. 



c. A steadily rising barometer with a southwest wind. 



d. A steadily falling barometer with a southeast wind. 



6. By means of a drawing show how the winds blow about 

 low- and high-pressure areas. Use arrows to indicate di- 

 rection. 



7. Of what value is the measurement of relative humidity 

 in forecasting weather ? 



8. If the wind of a storm shifts from east through north 

 to northwest, the center of * "low" passes (south, north) 

 of the observer. 



9. If a wind from the east dies down and then springs up 

 from the west, the "low" has passed the observer. 



10. If the wind of a storm shifts from the east through 

 south to southwest, the center of the "low" has passed 

 (north, south) of the observer. 



11. Establish a cause for the shift of winds as a low- 

 pressure area passes a certain point of observation. 



12. On certain days winds blow with great force. What 

 prediction could one make concerning temperature differ- 

 ences and pressure differences in adjacent air masses on 

 the basis of this observation? 



13. A shaded area on a weather map means 



14. How is an area in which snow is falling marked on 

 a weather map? 



15. Show the sign by which a partly cloudy area is marked 

 on a weather map. 



16. What does the letter "M" marked on a weather map 

 indicate? 



HAPPENINGS AND THEIR CAUSES 



How do the winds behave in the approach and passing 

 of a thunderstorm? 



In what section of a low-pressure area do thunder- 

 storms most frequently occur? 

 b. Problem 3 



From what type of cloud does the tornado usually 

 form? 



What gives it the rapid whirling motion which it pos- 

 sesses? 



What is the difference between a tornado and a cy- 

 clone? 



How widespread is the average tornado? 



What is the size of the funnel cloud at its bottom? 



Why do buildings appear to explode outwards during 

 a tornado? 



