What characteristics are found above the trade winds?

The region found above the trade winds is characterized by good visibility and clear skies. This is primarily associated with the presence of the subtropical ridge, where there is sinking air that inhibits cloud formation. As air descends, it warms and dries, leading to clearer conditions. This is why you typically find high-pressure systems in this area, resulting in stable atmospheric conditions and minimal precipitation.

In contrast, other options describe weather phenomena that are more typical of different atmospheric conditions. For instance, poor visibility and thick clouds are characteristics found in unstable atmospheric conditions, often present in lower pressure systems or fronts. Heavy rain and low pressure are associated with regions of convection and storm systems, whereas high humidity and storms are typical in tropical regions or areas under the influence of the Intertropical Convergence Zone, which is beneath the trade winds rather than above them. Thus, the unique dynamics and characteristics of the subtropical ridge above the trade winds contribute to the presence of clear skies and good visibility.