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Hurricane evacuation is the immediate and rapid movement of people away from the threat or actual occurrence of a hurricane .. hurricane. hurricane. Local authorities in a predicted hurricane path often recommend or order evacuation of designated flood zones .. hurricane. hurricane. Some jurisdictions , such as Pinellas County , Florida , use the output from the Sea , Lake , and Overland Surge from Hurricanes -LRB- SLOSH -RRB- storm surge model developed by the U.S. Federal Emergency Management Agency -LRB- FEMA -RRB- to create their evacuation zones .. Federal Emergency Management Agency. Federal Emergency Management Agency. storm surge. storm surge. These zones loosely correspond to the maximum expected storm surge expected during a category of hurricane .. hurricane. hurricane. storm surge. storm surge. category of hurricane. Saffir–Simpson scale. Since these evacuation maps are used by the general public and a more static nature is desirable , some minor averaging or ranging of data is performed before creating the maps .. Changes in variables such as mean high-tide , forward speed and direction of the hurricane , and central pressure all affect the output of the SLOSH model .. hurricane. hurricane. The longer a person has lived in a coastal area , the less likely they are to evacuate .. Hurricanes have a longer warning time than most disasters , but details of strength and track are only educated guesses .. Official warnings , as with other scenario planning , are based on a worst case , which is not the most probable case .. scenario planning. scenario planning. worst case. worst case. Thus , hurricanes can be predicted to hit a coastal town many times without the town ever actually experiencing the brunt of a storm .. When this more probable case happens a number of times , people tend to take evacuation orders less seriously .. If evacuation orders are given too early , the hurricane can change course and leave the evacuated area unscathed .. hurricane. hurricane. People may think they have weathered hurricanes before , when in reality the hurricane did n't hit them directly , giving them false confidence .. hurricane. hurricane. Those who have lived on the coast for ten or more years are the most resistant to evacuating .. Despite mandatory evacuation orders , many people did not leave New Orleans , as Hurricane Katrina approached .. New Orleans. New Orleans. Hurricane Katrina. Hurricane Katrina. Even after the city was flooded and uninhabitable , some people still refused to leave their homes .