Due to its high humidity, the south often experiences severe storms with heavy rains

Hurricanes (I figure your talking about United States)

Explanation:

I live in Florida and Cyclones are the Hurricane equivalent in the South Pacific Region, Monsoons are a Season Reversing wind accompanied by rain and wind, and Tornado's mainly happen in the Middle part of America as the northern winds and southern ocean wins combine to create funnel clouds and this region in the Great Plains area is known as "Tornado Alley"

To study its features.

Explanation:

People used physical and human geography to understand the history of early civilizations because the features and characteristics of physical and human geography provides information about the factors in order to understand the history of early civilization. Physical geography provides information of resources in that environment which was used by the early civilization for their survival and growth.