WEATHER FLAGS AND SIGNALS 7 



with the Weather Bureau in making the information available to the 

 public in general. It is thus possible to obtain the official weather 

 forecast by calling the central exchange of almost any telephone one 

 may be using. 



Signals of the United States Weather Bureau. 

 Flag Signals (Fig. 2) 



W k k' h 



Fig. 2. — United States flag signals. 



No. 1, square white flag, alone, indicates fair weather, stationary tem- 

 perature. 



No. 2, square blue flag, alone, indicates rain or snow, stationary tem- 

 perature. 



No. 3, square, white above, blue below, alone, indicates local rain, 

 stationary temperature. 



No. 4, triangular black, refers to temperature. 



No. 5, square white, with black center, cold wave. 



No. 1, with No. 4 above it, indicates fair weather, warmer. 



No. 1, with No. 4 below it, indicates fair weather, colder. 



No. 2, with No. 4 above it, indicates warmer weather, rain or snow. 



No. 2, with No. 4 below it, indicates colder weather, rain or snow. 



No. 3, with No. 4 above it, indicates warmer weather with local rains. 



No. 3, with No. 4 below it, indicates colder weather with local rains. 



No. 1, with No. 5 below it, indicates fair weather, cold wave. 



No. 2, with No. 5 below it, indicates wet weather, cold wave. 



\Vhistle Signals 



The warning signal, to attract attention, will be a long blast of 

 from fifteen to twenty seconds' duration. After this warning signal 

 has been sounded, long blasts (of from four to six seconds' duration) 

 refer to weather, and short blasts (of from one to three seconds' dura- 

 tion) refer to temperature ; those for weather to be sounded first. 



