OBSERVATIONS AND PREDICTIONS OF THE WEATHER 79 



During the course keep observations on the weather in the 

 above tabulated form. 



PREDICTION OF WEATHER BY SPECIAL OBSERVATIONS 



Special Observation. The following material is often used by people to 

 roughly forecast weather. This should be studied to determine whether 

 any of the sayings are fallacies. 



"Halo" around the moon. The smoke falling toward the ground. (Indica- 

 tion of storm, as the barometer is reading low, and the atmosphere full of 

 water vapor is lighter than the smoke. Dry air is heavier than air full of 

 water vapor.) 



To Predict Weather by the Clouds. 



Soft-looking or delicate clouds foretell fine weather. 



Small black clouds foretell rain. 



To Predict Weather by the Sky. 



A bright blue sky indicates fair weather. 



Yellow sky at sunset, wind. 

 . Pale yellow, rain. 



Dark, gloomy, blue sky, light wind. 



Dark, oily looking clouds, wind. 



Rosy sky at sunset, fine weather. 



Sickly looking green hue, wind and rain. 



Streaks in the sky, often miscalled "the sun drawing water," foretell 

 rain. The sun is shining through an excess of moisture in the sky, between 

 the clouds. 



Rainbow in the afternoon, fair weather. 



A dark red sky, rain. 



A red sky in the morning, wind and rain. 



Gray sky in the morning, fair weather. 



Remarkable clearness of the atmosphere near the horizon, distant objects, 

 hills, islands raised or unusually visible; and what is called a good hearing 

 day, foretell rain and wind. This condition is called a "land loom'* by 

 fishermen, who usually prepare at once for a storm. 



After fine weather, the first signs in the sky of a coming change are usually 

 light streaks, curls, wisps, or mottled patches of distant white clouds which 

 increase, and are followed by an overcasting of murky vapor that grows into 

 cloudiness. The appearance indicates wind and rain, and may be observed 

 in the atmosphere sometimes two or three days before a storm. 



If the sun before setting appears diffused and of a brilliant white, it fore- 

 tells storm. 



If it sets in a sky slightly purple, the atmosphere near the zenith being 

 of a bright blue, we may look for fine weather. 



