NASA satellites image Fort McMurray fires day and night

The grayish brown swirl that is combining with the clouds billowing over Alberta and Saskatchewan, Canada is smoke that has risen from the Fort McMurray fire complex.  This image taken by the Terra satellite's Moderate Resolution Imaging Spectroradiometer (MODIS) on May 17, 2016.  Actively burning areas, detected by MODIS's thermal bands, are outlined in red.