On October 29, 2003, a shift in the winds over the Southwest U.S. sent smoke from the California wildfires (marked in red at left) northeastward to Nevada and eastward to Arizona. This <a href="http://modis.gsfc.nasa.gov" target="outlink">Moderate Resolution Imaging Spectroradiometer</a> (MODIS) image is from the <a href="http://terra.nasa.gov/" target="outlink"> Terra</a> satellite on the afternoon of October 29. Sensor: Terra/MODIS. Data Start Date: 10/29/03. Data End Date: 10/29/03.