3 ms·See http://www.aoml.noaa.gov/hrd/tcfaq/C5f.html http://www.aoml.noaa.gov/hrd/tcfaq/C5f.htmlby rglovejoy 17y agoSee http://www.aoml.noaa.gov/hrd/tcfaq/C5f.html http://www.aoml.noaa.gov/hrd/tcfaq/C5f.html