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Keywords:

  • coastal tornadoes;
  • hurricanes;
  • hurricane hazards;
  • hurricane-tornadoes;
  • tornadoes

abstract.

This study provides climatological descriptions of tornadoes associated with Gulf Coast-landfalling hurricanes during the 1950–2005 period using gis and statistical methods. Specific climatological descriptions provided are hurricane-tornado activity per hurricane and physical, temporal, and spatial characteristics of hurricane-tornadoes. Our analysis indicates that, although hurricane-tornadoes are a common phenomenon associated with hurricane landfalls along the Gulf coastline, their frequency is variable. Some hurricanes produce no tornadoes, whereas others produce more than 100. Relatively weak hurricane-tornadoes and those with relatively short path lengths and narrow path widths are most common. Hurricane-tornadoes occur most often in August and September, during afternoon hours, and after their associated hurricane makes landfall. Hurricane-tornadoes have occurred throughout the Gulf Coast region, but most are located within 200 kilometers of the coastline. Lastly, hurricane-tornadoes are most often situated to the right of their associated hurricane center, relative to directional heading.