3 ms·http://www.ncdc.noaa.gov/oa/mpp/freedata.html http://www.ncdc.noaa.gov/oa/mpp/freedata.htmlby joubert 16y agohttp://www.ncdc.noaa.gov/oa/mpp/freedata.html http://www.ncdc.noaa.gov/oa/mpp/freedata.html