See those videos of Mt. Merapi, central Java island, going off 3 days ago?
They show vast clouds shooting into the atmosphere and then a wall of pyroclastic flow/debris….still miles away in the background moving down slopes towards the people on the roads fleeing
This one, from 3 Mar 2020 is hugely impressive.
Thanks to Bill Sellers for these videos
“Very authentic & terrifying,” says Bill. “Means will be LOTS OF SNOW THIS COMING WINTER.”