291 



THE ATMOSPHEEE AND METEOEOLOGY. 



CHAPTER XII. 



EDDIES OF TEMPESTS. — WHIRLWINDS. 



The atmospheric movements called tempests or gales by seamen 

 differ from the cyclones by their slighter intensity, but are more 

 numerous. In certain parts of the ocean, especially in the North 

 Atlantic, they are so frequent, that during some months of the year 

 we may expect a tempest once every two days. This is shown by the 

 accompanying map, every rectangle of which indicates the number of 



fS 80 7> /g ffS fo- S5 So dJ 4o SS 3o rs"^-. 



S~ o ~~s 



J /o 60 t>o 5 J io i-S (.0 oS Jo zS 20 x5 ix> 5 



ij-iS .-^/TAo 3i.3S iC.Ho ■:t;3o sj^zS u.iS 6.1a 5 



Fig. 118.— Tempests of the North Atlantic in December, January, and February. 



tempests by a different tint. All these gales are propagated in spirals 

 analogous to those of the hurricanes. Storms of winter or tempests 



