78 



GENERAL SCIENCE 



that the wind is expected to blow from the northerly quadrants; 

 below, from the southerly quadrants. 



By night, a red light indicates easterly winds, and a white 

 light below a red light, westerly winds. 



Hurricane Warning. Two red flags with black centers, displayed 

 one above the other, indicate the expected approach of a tropical 

 hurricane, or one of those extremely severe and dangerous storms 

 which occasionally move across the lakes and northern Atlantic coast. 



No night small craft or hurricane warnings are displayed. 



Recording the Amount of Cloudiness. If the sky is ^ or less 

 covered with clouds, the day is called clear; ^ to A, partly clouded; 

 fu and over, cloudy. 



FIG. 62. A set of weather instruments which prove very helpful in the study 



of weather conditions. 



WEATHER CHART 



