WIND TABLES. 



XXIX 



Also 



V c = 



I-37I3 

 pds'mcp 



1.8284 

 pd sin <p 



6-4552 

 _ pd sin $ 



(IV) 



(V) 



(VI) 



and R c = 



18.806 

 pd sin 2 



25-Q73 

 pd sin 2 <p 



245QO 

 _ pd sin 2 <p 



Units of 

 pressure. 



(VII) (Millibars) 

 (VIII) (Millimeters) 

 (IX) (Inches) 



Radius of critical curvature and velocities of gradient winds for frictionless 

 motion in Highs and Lows. 



Table 42. English Measures. tables 42, 43. 



Table 43. Metric Measures. 



These tables give the radius of curvature of the critical isobar in anti- 

 cyclones, computed from the equation 



R c = 



AP 



pco 2 sin 2 <p' 

 the velocity of the wind on this isobar, computed from the equation 



v. = -M-, 



pw sin 4> 

 the velocity of the wind on a straight isobar, computed from the equation 



V s = ^5— - = - V c ; and 



2 pco sin cp 2 c 



the velocity of the wind in a cyclone having the same gradient as the anti- 

 cyclone, and on an isobar having a radius of curvature equal to R c , com- 

 puted from the equation 



V x - V c (\Z"2 - 1) = 0.414 v c 



Table 42, English measures, gives values of R c , in miles, and of V c 

 High, V s , and V Low, in miles per hour. The side argument is the latitude 

 for io°, and at 5 intervals from 20 to 90°, inclusive. The top argument, 

 d, is the perpendicular distance in miles between isobars drawn for pressure 



intervals of — inch. For values of d one tenth as great as given in the 

 10 



heading of the table the values of R c , V c High, V s , and V Low are increased 



tenfold. 



Table 43, metric measures, gives values of R c in kilometers, and of 



V c High, V s , and V Low, in meters per second. The side argument is the 



same as in Table 42. The top argument, d, is the perpendicular distance 



in kilometers between isobars drawn for pressure intervals of 1 millimeter. 



For values of d one tenth as great as given in the heading of the table the 



values of R c , V c High, V s , and V Low are increased tenfold. 



