158 



N CLIMATOLOGY 



1,000 



700 

 500 



300 



200 



E 



^ 100 



? 70 



^; 50 



UJ 30 



< 



t- 



'0 20 40 60 80 100 120 140 160 ISO 200 



HEIGHT ,h , IN m 



Figure 4.49. Height versus distance at Washington, D.C., for maximum midspring 



(May) ducting conditions. 



20 



40 



60 80 100 120 140 



HEIGHT , h , IN m 



160 



180 200 



Figure 4.50. Height versus distance at Washington, D.C., for mean midspring 

 (May) ducting conditions. 



