Abstract
Evacuation inland ("horizontal evacuation") is the traditional method of saving life in areas forecast as the site of hurricane landfall. But “high confidence”; warning time is only 12 hours, while some coastal areas are now so densely populated that twice that time is required for evacuation. Coastal managers must therefore risk the ire of local citizens “unnecessarily”; evacuated early, and the associated risk that several false alarms will reduce citizen compliance, or the risk that evacuation will be too long delayed. The alternative of vertical evacuation (going upstairs in hurricane‐proof buildings) is resisted by planners who are concerned that its risks are too high and that partial acceptance of the concept would vitiate compliance with the horizontal component. But in some areas there may no longer be a choice: prudent coastal managers must determine the potential need and capability for vertical evacuation in their areas. Effective integration of both vertical and horizontal evacuation will require development of new plans and policies.

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