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Alternative Metrics of Tropical Cyclone Impact


Tropical cyclone damage potential, as currently defined by the Saffir-Simpson scale and the maximum sustained surface wind speed in the storm, fails to consider the area impact of winds likely to force surge and waves or cause particular levels of damage. Integrated kinetic energy represents a framework that captures the physical process of ocean surface stress forcing waves and surge while also taking into account structural wind loading and the spatial coverage of the wind.

Integrated kinetic energy is computed from gridded, objectively analyzed surface wind fields of hurricanes now available in near real-time from the H*Wind web page

A wind destructive potential rating is constructed by weighting wind speed threshold contributions to the integrated kinetic energy, based on observed damage in Hurricanes Andrew, Hugo, and Opal. A combined storm surge and wave destructive potential rating was assigned according to the integrated kinetic energy contributed by winds greater than tropical storm force. The ratings are based on the familiar 1-5 range, with continuous fits to allow for storms as weak as 0.1 or as strong as 5.99.

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Integrated Kinectic Energy Paper "The maximum sustained surface wind speed and the Saffir-Simpson scale are poor indicators of a hurricane?s destructive potential; integrated kinetic energy is more relevant to damage by wind, storm surge, and waves."

Integrated Kinectic Energy Calculator Calculate integrated kinetic energy values using wind radii from all four quadrants of a storm

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