Tropical Cyclone Wind Converter

Enter a tropical cyclone maximum wind speed and say which averaging period it refers to. The page converts it to the other averaging periods (WMO/TD-No. 1555 method) and shows the category it would be in under each agency’s scale, with a warning where that answer is not clear-cut.

Input

Max wind speed

kt

Entered in

Slide to adjust

Averaging period of this value

Show results in

Exposure (WMO factor set)

Round results to nearest 5 kt One decimal place

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Crosswalk – how the scales line up

NHC categories in agency terms Agency categories in NHC terms

Equivalent maximum wind by averaging period

Category by agency (highlighted row = where this storm falls)

Method, caveats and sources

Show self-test details

Reference tool only. Official advisories and agency documentation take precedence.