A hurricane warning specifies which of the following?

A hurricane warning indicates that hurricanes are imminent or occurring, with specific criteria related to wind speed. The warning specifies that sustained winds of 74 mph or higher are expected in the affected coastal areas. This urgency calls for immediate preparedness actions, as these wind speeds can lead to significant damage, including destruction of property, uprooting of trees, and hazardous conditions.

The focus on wind speed underscores the importance of understanding the physical impacts of hurricanes and how they can escalate safety concerns. In contrast, the other choices focus on preliminary advisories, general expectations of the storm's trajectory, or the mere possibility of a hurricane forming, which do not convey the immediate threat level that a warning does.