When can GWO TWR clear an aircraft for a visual approach?

Clearing an aircraft for a visual approach is contingent upon maintaining safe operational protocols that prioritize both traffic management and weather conditions. The correct answer emphasizes that GWO TWR can clear an aircraft for a visual approach "weather permitting with prior coordination with ZAE." This highlights the necessity for ensuring that current weather conditions are suitable for a visual approach, such as having adequate visibility and cloud ceilings.

Moreover, prior coordination with ZAE is key to managing air traffic effectively. This coordination allows for the necessary adjustments and notifications to be made to ensure safety and efficiency in the airspace. It ensures that both the tower and the air traffic controllers are aware of the situations affecting traffic flow and can manage any conflicting aircraft or operational considerations.

The other options do not fully address the need for safety and traffic management. For example, allowing visual approaches during peak traffic hours or only under certain weather conditions like rain disregards the broader requirement to ensure safe flying conditions and manage potential conflicts in the airspace. Additionally, stating that visual approaches can be cleared at any time without prior coordination would compromise safety and situational awareness among air traffic control operations.