These storms can have maximum winds extending further from the center than in a purely tropical cyclone. The maximum recorded wind speed for a subtropical storm is 33 meters/second (74 miles per hour). In the Atlantic Ocean basin, the United States NOAA classifies subtropical cyclones based on maximum sustained surface winds: below 18 meters/second is a subtropical depression, and at or above 18 meters/second is a subtropical storm.
See also: NOAA FAQ on subtropical cyclones (http://www.aoml.noaa.gov/hrd/tcfaq/A5)
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