QT Yellowstone Caldera (the eruptions of which can be violent enough to send a layer of ash six feet deep as far away as Chicago and which erupts every 600,000 or so years and last erupted 640,000 years ago) update

Yellowstone Park
Sally Sennert, a geologist with the Smithsonian Institution’s Global Volcanism Program, offering a prediction on “the biggest explosion ever recorded by humans” happening any time soon at Yellowstone:
“Volcanologists are very wary of ever telling somebody that a volcano is safe, because they are so unpredictable.”

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