The June 07, 2016 Canadian Interagency Forest Fire Centre’s National Wildland Fire Situation Report shows that overnight from June 6 to June 7, seven fires were started by lightning strikes. The report also notes specifically that none of the fires in Quebec currently are prescribed fires so all fires present in this image are accidental in nature as the report does not attribute any of the seven overnight fires as human caused.
Each hot spot, which appears as a red mark, is an area where the thermal detectors on the MODIS instrument recognized temperatures higher than background. When accompanied by plumes of smoke, as in this image, such hot spots are diagnostic for fire.
NASA’s Suomi NPP satellite collected this natural-color image with the VIIRS instrument (Visible Infrared Imaging Radiometer Suite) on June 07, 2017. Actively burning areas, detected by MODIS’s thermal bands, are outlined in red. NASA image courtesy Jeff Schmaltz LANCE/EOSDIS MODIS Rapid Response Team, GSFC. Caption by Lynn Jenner with information from the Canada Interagency Forest Fire Centre.