xv- Contents. 



PAGE. 



GENERAL CIRCULATION OP THE ATMOSPHERE 562 



World system of winds, p. 562 ; Wind zones, p. 563 ; Direction af- 

 fected by form and rotation of the earth, p. 564 : Character of 

 the winds, p. 564 ; Weather of the wind zones, p. 565 ; Shift- 

 ing of the zones, p. 565. 



CONTINENTAL WINDS 666 



Influence of continents on winds, p. 566; Winds of January, p. 

 567 ; Winds of July, p. 567 ; Monsoons, p. 570. 



ORDINARY STORMS 570 



Cyclones, p. 570 ; Cause of wind directions, p. 570 ; Progressive 

 movements, p. 572 ; Direction of movement, p. 574 ; Rate of 

 progress, p. 574 ; Diameters, p. 574 ; Duration, p. 575 ; Region 

 of precipitation, p. 575 ; Origin, p. 576. 



CHAPTER XXVI. 



WEATHER CHANGES. 



PRINCIPLES OF FORECASTING WEATHER CHANGES 578 



Prevailing winds of locality, p. 578 ; Locating storm center, p. 

 579 ; Change of wind direction, p. 579 ; Direction of storm cen- 

 ter, p. 579 ; Predicting the course of the storm track, p. 580 ; 

 Temperature changes, p. 580 ; Barometric changes, p. 582. 



COLD WAVES 582 



Forecasting warm and cold weather, p. 583. 



LONG WARM AND DRY PERIODS 583 



TROPICAL CYCLONES 585 



THUNDER STORMS, HAIL STORMS AND TORNADOES 586 



Relations to ordinary storms, p. 586 ; Tornadoes, p. 586 ; Schools 

 of tornadoes, p. 588 ; Distribution of thunder showers, p. 588 ; 

 Conditions of formation, p. 588; Formation of tornadoes, p, 

 589 ; Explosive violence of tornadoes, p. 590 ; Unsteady move- 

 ment, p. 591 ; Character of tornado path, p. 591 ; Formation of 

 thunder showers, p. 592; Formation of hail, p. 592. 



