Although highly unlikely, this is what would happen.
Imagine it's late June and you have just gotten off the lift. Suddenly, the ground begins shaking like an earthquake and the ground splits and tilts. Smoke, and fumes pour out of the crack. Then there is a small explosion, sending small amounts of lava and pyroclastic rocks flying. The ground is still shaking, and at this point you're racing down the mountain (you're probably going switch, because it's interesting and you want to watch, and you need to practice switch 2s on). The top of the mountain is nothing but smoke. Lava begins slowly pouring out of the top. You reach the bottom and hop into a windells van. Will Berman is driving while Steve Stept is in the back freaking out. Will finds a cave and hides inside it. All of the sudden, Hood blows. Massive explosion, smoke everywhere, massive pyroclastic rocks are flying through the air. The mountain is desimated, but the van survived in the cave.  You emerge from the cave and see "silent rock" smoldering in the middle of the road.  Steve is crying because his skis got stolen in the cats and you hit him for talking in the presence of "silent rock".  All mount hood camps close.  The end