By Adam Voiland
1 July 2015
(NASA) – The 2015 fire season got off to an unusually early start in Canada when blazes broke out in the Northwest Territories, British Columbia, and Alberta in late May. As the season has progressed, the air in western Canada—as well as large swaths of the United States—grew gray and hazy with smoke.
Beginning on June 28, a sharp trough in the jet stream sent a river of smoke streaming south into the United States. By June 29, smoke darkened the skies over much of Saskatchewan, Alberta, Manitoba, North Dakota, South Dakota, Minnesota, and Iowa.
On June 29, 2015, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this image of smoke from hundreds of wildfires in western Canada. Actively burning areas, detected by the thermal bands on MODIS, are outlined in red, while forests appear dark green. The image below shows a closer view of smoke and fires burning in northern Alberta near the Athabasca oil sands. While hundreds of fires are burning throughout Canada, some of the fires producing the most smoke are clustered in this area.
A combination of unusually warm temperatures, parched forests, lightning, and strong winds have fueled the outburst of fire. According to the Canadian government, 168 uncontrolled fires and 273 controlled fires were burning in Canada on June 29. More than than 1,300 people have had to evacuate their homes, and health officials have issued health warnings in several provinces because of the smoke.
References and Related Reading
- Canadian Interagency Forest Fire Center (2015, June 29) National Wildland Fire Situation Report: June 29, 2015, 15:00 Hours. Accessed June 30, 2015.
- CBC News (2015, June 30) Saskatchewan smoke expected to stay for days, says Environment Canada. Accessed June 30, 2015.
- Edmonton Sun (2015, June 28) Alberta experiencing one of the worst wildfire seasons in the past five years. Accessed June 30, 2015.
- Discover (2015, June 29) Smoke From Hundreds of Wildfires in Canada Streams South Across Much of the Central United States. Accessed June 30, 2015.
- OMPS blog (2015, June 29) Smoke Makes Its Way Into the Midwest US. Accessed June 30, 2015.
- NASA Earth Observatory (2015, February 4) High-Latitude Forest Fires Behave Differently in North America and Eurasia.