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Tropical Weather
Hurricane Categories
Hurricanes are rated using the Saffir-Simpson scale. For more details, look below.  
Saffir-Simpson Scale
The Saffir-Simpson scale is used to classify the strength of tropical storms and hurricanes. The scale uses wind speed as a determining factor...with hurricanes rated from Category 1 (74-95 mph) to Category 5 (155 + mph).

As the wind speed increases, storm surge becomes more of an issue. The storm surge is ocean water that has been piled up by the wind and driven inland...sometimes causing serious flooding.

Below is a table showing the Saffir-Simpson scale (wind speeds and expected storm surge), along with a few past hurricanes and where they were represented on the scale.                  

 
Saffir-Simpson Scale
Category Wind Speed (mph) Storm Surge (ft) Example
Tropical Depression < 39 -- --
Tropical Storm 39-73 -- --
Category 1 Hurricane 74-95 4-5 Allison (1995)
Category 2 Hurricane 96-110 6-8 Georges (1998)
Category 3 Hurricane 111-130 9-12 Fran (1996)
Category 4 Hurricane 131-155 13-18 Opal (1995)
Category 5 Hurricane 155+ 18+ Gilbert (1988)
Back to Tropical Weather Page
http://www.srh.noaa.gov/lzk/html/ss-scale.htm
 

 

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Page last modified: 15 March, 2003
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