The Moderate Resolution Imaging Spectroradiometer (MODIS) aboard NASA’s Terra satellite observed a large pall of smoke blowing eastward over Canada’s Yukon Territory on July 5, 2004. The smoke can be distinguished from both the clouds and snow and ice in this true-color scene by its darker, gray shade. Notice also there are several yellow dots toward the bottom center of this image, indicating the locations of actively burning fires. This smoke was generated from the large, intense fires burning in several places across Alaska.
NASA image by Jesse Allen, produced using data provided by the MODIS Land Rapid Response Team at Goddard Space Flight Center
Smoke from large forest fires in Alaska has made the rounds across several parts of the Northern Hemisphere since the fires began in mid-June 2004. In this scene, smoke is spreading southward along the western arc of the Alaska Range Mountains and the Alaska Peninsula.