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Defining Hurricanes & Tropical Storms

The following is a list of terms relevant to hurricanes and tropical storms. If a storm threatens the Charleston County area and you are either required or feel the need to evacuate, please see Charleston County's Evacuation Information

Tropical Storm
Once winds within tropical system reach 39 mph and the distinct low pressure area is well defined by a rotating circulation, the system is considered a tropical storm and is given a name.

Hurricane
A Tropical Storm that has sustained winds exceeding 74 mph or greater, dangerously high water and rough seas.

Hurricane Watch
A Hurricane Watch is issued when hurricane conditions are a real possibility for an area within 48 hours. For a list of tasks to complete during a Hurricane Watch, see the Charleston County Hurricane Fact Sheet

Hurricane Warning
A Hurricane Warning is issued when a hurricane is expected within 36 hours. Begin precautionary action at once. For a list of tasks to complete during a Hurricane Warning, see the Charleston County Hurricane Fact Sheet