What should be said when issuing a message warning of a hurricane?

When issuing a message warning of a hurricane, the appropriate terminology to use is “Hurricane Warning” or “Warning-warning-warning.” This indicates a serious situation that requires immediate attention and action. The term "warning" specifically conveys that conditions are imminent and potentially dangerous for people and property.

The other options refer to different types of communication in emergency situations. “Emergency-emergency-emergency” is used to signal a distress situation, typically indicating that there is an immediate life-threatening emergency on board a vessel. “Security-security-security” alerts listeners to a situation that requires specific attention but does not imply imminent danger or distress. “PAN PAN PAN” is used for urgency; it signifies a situation that is urgent but not life-threatening.

Thus, using “Warning-warning-warning” is correct as it directly addresses impending severe weather conditions, such as a hurricane, and informs individuals to take precautions accordingly.