In the Waffle House Index, red means that a restaurant is closed.
The index uses restaurant operations as a shorthand for disaster severity. A red status indicates severe or critical conditions, such as major structural damage, flooding, or other destruction that prevents the location from operating. It is the most serious level in the informal three-color system.
Green represents the opposite condition: a restaurant is open with its full menu, and power and supplies are generally available. Yellow falls between the two, indicating a limited menu because of a generator, power problems, reduced supplies, or other operational constraints.
The system became associated with hurricane and tornado response because Waffle House restaurants are famous for remaining open in difficult conditions. Emergency officials and journalists use the color metaphor as a quick snapshot of local recovery, but it is not a replacement for official measures of storm intensity or damage assessments.