CHAPTER XVIII. 



Weather Signs and Protections from Frost. 



Stationary barometer indicates continuance of the present 

 weather. 



Slowly rising barometer usually indicates fair weather. 



Slowly falling barometer indicates the approach of a severe 

 storm. One-fifth to one-third of an inch is sufficient fall to give 

 indications. 



Sudden rise of the barometer indicates the approach of a storm 

 or the breaking-up of an existing storm. 



Sudden fall of the barometer indicates high winds and probable 

 rain. 



When areas of low and high barometer are near together, 

 heavy gales may be expected. 



Long lines of clouds extending up the sky from a common 

 starting-point often fortell a storm from that quarter. 



When the fleecy or cirrus clouds settle down into horizontal 

 bars or ribs in the upper sky, wet and foul weather may be ex- 

 pected. This is the ''mackerel sky." 



If contiguous clouds move in various directions, rain is likely to 

 follow soon. 



When small black clouds scud over an overcast sky, heavy rain 

 and bad weather may be expected. 



Cumulus clouds that preserve a well-rounded form and float 

 high in the air indicate fair weather. 



Anvil-shaped cumulus clouds usually indicate thunder-storms. 



In spring and fall, rain is often indicated by a dense bank of gray 

 clouds in the east, in front of which are little shoals of blackish 

 clouds. 



Cirro-cumulus clouds — like bunches and fleeces of wool scat- 

 tered high in the sky— are indications of still and dry weather. 



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