What is NOT a requirement for the formation of tropical cyclones?

For the formation of tropical cyclones, cool ocean temperatures are not conducive; in fact, warm ocean waters are essential. Tropical cyclones typically form over warm ocean waters where temperatures are usually above 26 degrees Celsius (79 degrees Fahrenheit). This warmth provides the necessary thermal energy that fuels the cyclone’s development.

High-level divergence is crucial because it allows for rising air to escape aloft, which helps maintain the low-pressure system at the surface. The relationship with the equatorial trough is also critical, as it provides the necessary convergence and uplift, which are key to cyclone formation. Additionally, thermal energy availability is fundamental since it drives convection processes essential for the storm's growth.

Thus, the presence of cool ocean temperatures is the factor that does not support the formation of tropical cyclones, making it the correct answer.