94 IRature'0 



the weather is unusually clear and cold, and 

 generally clear and fairly cool at any season, 

 and while there may be some wind it is not so 

 strong as in the cyclone or low-pressure center. 

 At this point it will be warmer and winds will 

 prevail, with rain or snow, the winds varying 

 in direction and intensity at a given point as 

 the cyclone moves forward. In the center of 

 these cyclones and anti-cyclones there will be 

 a region of comparative calm, and the air is 

 ascending at the center of the area of low 

 pressure while it is pouring in on all sides 

 from the area of high pressure where the air 

 is compressed by a downward current from the 

 upper regions. 



The high-pressure or anti-cyclone system 

 usually covers a larger area than the low- 

 pressure system, where the air is ascending. 

 While the air moves laterally from high to 

 low, it does not move in a direct line. The 

 air movement outside of the high-pressure 

 center is usually not at a very high speed, but 

 in northern latitudes in the direction of the 

 hands of a clock. As it circles around it 

 widens out spirally until it reaches the edge 

 of a low-pressure system, when it bends in its 

 course and moves in the other direction 

 around this center, but constantly moving in- 

 ward toward it in a spiral form and in a direc- 

 tion that is reverse to that of the hands of a 

 clock. When the air current comes within the 



