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As with the Australian wildfires in early 2020, many of the fires in the West exhibited extreme behavior, with giant, billowing thunderheads of ash and smoke, known as pyrocumulus clouds, transporting fire emissions into the upper levels of the atmosphere, above the height of typical airliner cruising altitudes. Because the smoke reached such lofty heights, it’s likely on an around-the-world journey, similar to the Australian event.