Yesterday I saw a bunch of yellowjackets flying around and inside the newest split I have. Today I hunted them down, and found a large nest in the hot tub insulation. One of them stung me as I sprayed them, and it barely hurt compared to a bee sting. Maybe I am used to getting stung now.
Here is the queen and a worker:
It was a 3 tiered nest, and surrounded by a paper sack kinda thing - round like you see in the movies. The sack kinda broke into pieces, but here is the nest.