SURFACE ISOTHERMS -"C 



Boltimore 



lOOfms 



40°N 



Charlesto 



eo'w 



Figure 15. 



75" /CW 



Monthly surface isotherm chart, 19, 23, 24, 26, 27, 30 August 1971 



35° 



30° 



25°N 



19 



