CHAPTER XVIII. 



WEATHER SIGNS, AND PROTECTION 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 wind and prob- 

 able rain. 



When areas of low and high barometer are near together, 

 heavy gales may be expected. 



Long lines of cloud extending up the sky from a common 

 starting point often foretell 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 

 expected. 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 



(157) 



