This is Mt. St Helens, from a LIDAR image. That’s a truckload of magma every second, folks. The dome is moving up very slowly and smoothly, but what goes up eventually comes down. An explosion or periclastic event is now unlikely, but a dome collapse (god help ya if you’re flying downwind) is probably in the cards sometime over the next 5 – 10 years. At that point all of the ice still on and in the crater will abrumptly melt (sp deliberate) and you’ll get a column of superheated steam and ash about 15K meters high.