Our Aqua satellite captured this composite visible (left) and infrared (right) image on Sep. 29, 2020, which shows that fires and smoke continue to dominate the landscape of the western U.S. The visible image shows the smoke and the infrared image shows the heat from the fires (orange points). The California Department of Forestry and Fire Protection (CAL Fire) page for Sep. 30 finds many large fires still active throughout California and the Pacific Northwest. The August Complex in California continues to be the largest wildfire still active and uncontained at 949,055 acres, located in Glenn, Lake, Mendocino, Tehama, and Trinity Counties. The August Complex is the largest wildfire in California’s history having surpassed the Mendocino Complex fire which burned 459,123 acres in July 2018. In this image, the smoke which had previously crossed the country by heading east has now shifted and is heading out to the west, billowing out over the Pacific Ocean.

Further complicating fighting the fires is the weather pattern predicted by the National Interagency Fire Center (NIFC) in its daily report from Sep. 30, 2020: “A broad upper ridge building over the West will yield increasingly hot, dry, and unstable conditions for California, the Desert Southwest, and the Great Basin. Fires actively burning in Northern California will be challenged by near or record-breaking heat and very low relative humidities.” The NIFC also provides predictive maps to show areas that have above normal significant wildland fire potential.

NASA’s satellite instruments are often the first to detect wildfires burning in remote regions, and the locations of new fires are sent directly to land managers worldwide within hours of the satellite overpass. Together, NASA instruments detect actively burning fires, track the transport of smoke from fires, provide information for fire management, and map the extent of changes to ecosystems, based on the extent and severity of burn scars.

Image Credit: NASA


国家跨机构消防中心(NIFC)在2020年9月30日的每日报告中预测的天气模式进一步加剧了这场大火的复杂性:“西部一个广阔的上部脊建筑将给加州、西南沙漠和大盆地带来越来越炎热、干燥和不稳定的条件。在加利福尼亚北部积极燃烧的大火将受到接近或创纪录的高温和非常低的相对湿度的挑战。” NIFC还提供了预测性地图,以显示超出正常的重大野火潜力的地区。



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