The Yellowstone Caldera is a giant volcanic mass underneath the Yellowstone National Park.
It last exploded about 250,000 years ago and on average does about that about every 250,000 years. It’s estimated by scientists to be a few hundred years over due.
When it does blow, and it will pretty much the entire United States, a good quarter of Canada and about a third of Mexico will go up with it.
Want to know what it would be like? Really?
Go and study the years 536 to 538AD.
Only one thing. Time it times at least ten.
536 was the years the earth went dark for quite a while. There was one massive eruption...most likely Tambora and then a couple years later another BIGGER eruption most likely in Central America..Ilopango.