Table 37 (concluded) 



GEOSTROPHIC WIND, CONSTANT PRESSURE SURFACE 



100 geopotential meter contours 



121 



where An is the contour spacing measured in degrees of latitude (i.e., one unit of An has 

 the length of one degree of latitude at the place for which the contour spacing is measured). 

 Table 37 gives values of V 9 in knots as a function of An and latitude with auxiliary 

 columns giving equivalents of An in kilometers, statute miles, and nautical miles. If the 

 latter are measured by a map scale true at some other latitude the value should be cor- 

 rected to the latitude at which the measurements are taken (see Table 165). 



Since the geostrophic wind is inversely proportional to the contour spacing and directly 

 proportional to the contour interval (A* gpm.), values of V B for 1/10 of the indicated 

 spacing may be found by multiplying the tabular values by 10, etc., and for contour 

 intervals that are multiples or submultiples of 100 gpm. by multiplying the tabular values 

 by A$/100 (e.g., for 200 gpm. contours multiply by 2, for 50 gpm. contours multiply by 

 i, etc.). 



(To convert knots to other measures of speed see Table 35.) 



SMITHSONIAN METEOROLOGICAL TABLES 



