The Warm Fire in northern Arizona was churning out a huge cloud of smoke on June 26, 2006, when the Moderate Resolution Imaging Spectroradiometer <a href="http://modis.gsfc.nasa.gov">(MODIS)</a> on NASA’s <a href="http://terra.nasa.gov">Terra</a> satellite passed overhead and collected this image just before 1:00 p.m local time. Places where MODIS detected actively burning fire are marked in red. Smoke spreads southward over the Grand Canyon. According to the June 27 report from the <a href="http://www.nifc.gov/nicc/">National Interagency Fire Center,</a> the Warm Fire had grown to more than 58,000 acres, and it had forced officials to close down the main highway that runs southward to the Grand Canyon. Sensor: Terra/MODIS.