Yes, there are scorpions in the SN...
Out here in Oakhurst, we have the quarter-sized variety. Yes, they are no bigger than a quarter, but they are quashed like a buzzing fly. The prefer to climb on ceilings. I find them in glass bowls in the kitchen, and I am in the habit of checking all of my footwear before putting my big toe into them.
I don't like em, but I live with em.
I am curious as to the size of the scorpion you spotted.
Another reason, folks, to keep those zippers on your tent closed.