What immediate action should a lifeguard take when they hear thunder in the distance?

When a lifeguard hears thunder in the distance, the immediate action of clearing patrons from the water is critical for safety. Thunder is typically associated with severe weather, including lightning, which poses a significant danger, especially near bodies of water. By removing patrons from the water, the lifeguard minimizes the risk of injury or fatality caused by lightning strikes.

This action reflects the principle of being proactive in ensuring safety during adverse weather conditions. Patrons should be safely guided to a designated safe area, such as a shelter or building, until the threat has passed.

While continuing to monitor patrons, calling for backup, or checking weather conditions might be important steps in a broader emergency response, they do not address the immediate threat posed by the potential for lightning when thunder is heard. Therefore, clearing the water takes precedence as it directly protects patrons from imminent harm.