Tropical cyclone movement and surrounding flow relationships.

Results show an important relationship between surrounding large-scale flow and tropical cyclone movement. For all stratifications, the winds in the mid-troposphere (500-700 mb) at 5-7^o latitude radius from the cyclone center have the best correlation with cyclone movement. Tropical cyclones in the Northern Hemisphere move approximately 10-20^o to the left of their surrounding mid-tropospheric flow at 5-7^o latitude radius, and those in the Southern Hemisphere move approximately 10^o to the right. It is also found that cyclones, in general, move approximately 1 m s^-1 faster than this flow.-from Authors