The image, shared online by NASA Earth Observatory (NEO), was snapped in skies over eastern Washington state at an altitude of about 30,000 feet (9 kilometers) as a NASA pilot flew into a so-called fire cloud. This phenomenon, also known as a pyrocumulonimbus or PyroCb cloud, occurs when heat and moisture from wildfires rise up into the atmosphere and form smoke-filled thunderclouds atop the fire's plumes, NEO reported.
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