rotates clockwise http://www.aoml.noaa.gov/hrd/tcfaq/D3.html http://www.aoml.noaa.gov/hrd/tcfaq/D3.html http://www.aoml.noaa.gov/hrd/tcfaq/D3.html http://www.aoml.noaa.gov/hrd/tcfaq/D3.html http://www.aoml.noaa.gov/hrd/tcfaq/D3.html http://www.aoml.noaa.gov/hrd/tcfaq/D3.html