As of July 21, the Detwiler fire—named for Detwiler Road, east of Lake McClure—had burned 74,083 acres (115 square miles or 298 square kilometers) and was 15 percent contained.
On July 20, 2017, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured a natural-color image of the fire and smoke spreading across central California. Data for the second image was acquired by the Thermal Infrared Sensor (TIRS) on the Landsat 8 satellite and is overlaid on a digital elevation model of the area. TIRS observes in wavelengths of 10.9 micrometers and 12.0 micrometers, revealing the amount of heat (thermal energy) radiating from the fiery landscape near the start of the fire. Cooler areas are dark, while warmer areas are bright.
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