The correct logging level to capture warnings of potential issues without seriously affecting the operation is 'Warning'. This level logs events such as potential issues and errors that are not necessarily critical or error level but could become a larger problem if not addressed. The 'Informational' level would contain too much extraneous data, as it logs all successful operations. The 'Alert' level is used for events requiring immediate action, which is a higher severity than warnings of potential issues. The 'Emergency' level is the highest severity, indicating the system is unusable, and is not the correct choice for capturing warnings about potential issues.