UNITED STATES WEATHER SERVICE 337 



No. 3. White and blue flag indicates local rain or 

 snow. 



No. 4. Black triangular flag is a temperature signal. 



No. 5. "White flag with black square in the center in- 

 dicates that a cold wave is expected. 



When No. 4 is placed above Nos. 1, 2, and 3, warmer 

 weather is expected; when placed below these signals, 

 colder weather is expected. A red flag with a black cen- 

 ter indicates a storm of great violence. A red pennant 

 signifies an easterly wind, while a white pennant indi- 

 cates a westerly wind. When either of these pennants 

 is placed above other flags, it signifies a northern wind, 

 but when placed below, a southern wind is promised. 



Practical Exercises 

 1. Keeping Weather Records 



Make daily weather observations for one week and 

 record your observations in the following table : 



Date | Temperature |' Moisture Conditions | Sky Aspect | Wind Direction 



2. Study of the Weather Signals 

 Ask your rural carrier to expose the Weather Service 



Signals on his wagon, and keep a record each day of 



what the signals indicate. Note whether the report is 



correct or not. 



Draw upon the blackboard of the school each day the 



flag shown by the weather report, which foretells the 



weather for the next twenty-four hours. 



