ICJOI.] 



FAIRCIIILD CVCLOXIC STORMS. 



309 



or cyclonic center. The changing wind direction may indicate the 

 same, and by watching the wind direction alone we can closely esti- 

 mate the direction of the storm center. In the charts showing the 

 laws of cyclonic movement it will be seen that the winds within the 

 cyclone move in general along the isobars, but curving obliquely 

 inward toward the center of the whirl. When one stands facing the 

 wind the cyclonic center is on the right hand and somewhat backward. 

 On the eastward or advancing side of the cyclone the winds are 

 southerly, warm and moist. On the western or retreating side of the 

 whirl the winds are from the north or northwest and cold and drying. 

 By noting with some care the direction of the wind at any time one 

 can judge the direction from the observer of the cyclonic center. By 

 watching the changes in the wind direction one can judge approxi- 

 mately the path of the cyclone or the direction of its progression. 

 The diagram of wind directions within the cyclone, figure i, will illus- 

 trate this. 



Fig. I. Diagram showing the theoretical wind directions within the cvclone. The arrows 

 fly with the winds. The concentric lines are isobars ( isoharometrics) or lines of equal air pres- 

 sure, drawn for tenths of inches of the mercury column. 



