The Saffir-Simpson Hurricane Wind Scale was developed in 1971 and unveiled ... That was done because wind speeds are measured in 5-knot increments by the NHC, and the conversion to a miles-per ...

Rapid intensification is defined by the National Hurricane Center as an increase of at least 30 knots (about 35 mph ... of two categories on the Saffir-Simpson scale. As it currently stands ...

The extension of the Saffir-Simpson Hurricane Wind Scale — the system used by the National Hurricane Center to rank the strength of hurricanes — to a sixth category is warranted, authors of ...