Scenario: Yellowstone Supervolcano Eruption

The Yellowstone Supervolcano Eruption was a catastrophic volcanic eruption which took place on March 9, 2053. It was caused by a sudden surge of seismic activity over the State of Wyoming, specifically in the cities of Jackson Hole, Bozeman, Cody, Gardiner, and West Yellowstone. The eruption caused several states to be rendered uninhabitable for several decades due to the thick layer of ash covering it. The eruption, while not an extinction-level event, was confirmed to have killed over 450,000 registered United States citizens with an unknown number of foreign tourists.
=== Information ===
The Yellowstone Caldera is a supervolcano located in Yellowstone National Park in Wyoming, United States of America. It is speculated that the caldera has existed for over 20 million years, and has caused about five to ten explosive eruptions. Scientists have confirmed that they were overdue for a Yellowstone major eruption, however estimated that it would not occur within the 2050-2060 decade. However, this was rendered false on March 9, 2053.
The Yellowstone Caldera has a peak elevation of 9,203 feet or 2,805 miles. A model of the ash distribution which Yellowstone would cause upon major eruption was presented sometime in early 2014. With it came the knowledge that no state was safe from the eruption and that areas of Canada and Mexico would be affected by this catastrophic event as well. The following message is the information presented in the 2014 Yellowstone Ash Distribution Model.
The states of Wyoming, Montana, and Idaho were predicted to face severe pyroclastic flows and an extremely thick, borderline impenetrable layer of ash which would plague the unlucky states for decades. These effects are caused due to Wyoming housing the Yellowstone Caldera and Idaho and Montana's relative short distance from Wyoming. The states were expected to be rendered uninhabitable for over two decades.
Northern Utah is expected to face severe to moderate pyroclastic flows and a thick blanket of ash due to its relative short distance from Wyoming.
Meanwhile, the remaining cities of Utah are predicted to be plagued with a 100-300 millimetre blanket of ash, followed by light pyroclastic flows which, while they would not cause the complete destruction of the state, would result in major damage. The states of Colorado, Nebraska, and South Dakota were expected to endure these effects, too.
A 30-100 millimetre of ash layer would now reach some of the Southern states, however most of the pyroclastic flows would not be active in these states, so damage would be moderate. The states covered with a 30-100 millimetre of ash blanket were expected to be the states of Kansas, New Mexico, Arizona, Nevada, Oregon, Washington, North Dakota, Minnesota, Iowa, and Oklahoma.
Finally, all other unnamed states would receive light to moderate damage. This includes most, if not all, of the East Coast, some Southern States, and some surprisingly less-affected Western states.
While this information was presented by a registered meteorologist, he made sure to remind all viewers that the Yellowstone Supervolcano Eruption was not expected to occur within the next 10,000 years.