580 Principles of Weather Forecasting. 



character of the sky and the weather, with experience, will 

 usually serve to distinguish these anticyclonic winds from 

 those belonging to the cyclone or storm proper. 



738. Discovering the Course the Storm Is Traveling. 



After having observed the existence and direction of a 

 storm center it is important to know whether it will pass 

 to the north or south of the. locality or whether it will move 

 directly across it. This can be foretold by the changes in 

 the direction of the wind. Referring again to Fig. 269 

 it will be observed that if the storm center comes directly 

 toward the observer the direction of the wind will hold 

 steady in the S. E. until after the storm has passed, when 

 it will shift abruptly to the !NT. W., as indicated by the ar- 

 rows laid on the axis of the storm track. If, however, the 

 storm center is passing considerably to the north of the ob- 

 server the winds will shift toward the south, finally becom- 

 ing S. W. But if the low area is passing to the south of 

 the observer then the winds will shift around by the north, 

 becoming finally N. W. and then W. 



If the winds hold steady, or if they shift to the north, a 

 general rain or snow may be expected, unless the storm 

 center is too distant, but if it is shifting toward the south, 

 showers, rather than widespread precipitation, may be an- 

 ticipated. After watching the progress of storms during 

 two or three months, comparing them with the daily 

 weather maps, one becomes able to recognize with much 

 certainty the approach of all well marked storms and to 

 forecast their course and the character of the weather 12 tc 

 24 hours in advance. Mistakes will occur, just as they do 

 with the Weather Bureau expert having a much wider 

 knowledge before him, but with a little experience the 

 judgment becomes much more reliable than would at first 

 be expected. 



739. Temperature Changes Connected with Storms. Dur- 

 ing the colder portions of the year the temperature changes, 

 which are associated with the progress of a storm across 



