I've definitely had plenty of encounters with wasps and hornets in Iowa, seem a lot more pissy than these yellow jackets currently do, but it's pretty cool now so I imagine that helps. I believe the ones we have right now are the german yellow jackets.
Bald Faced Hornet............Safely Removing the Nest
The bald Faced Hornet, also called White Faced Hornets, are members of the wasp family. They are known for making large, enclosed paper nests that generally consists of a small entrance hole usually near the bottom. Larger nests may have more than one entrance hole. The average sized nest is about the size of a football, but can can get many times larger. The hornets are fast fliers and can quickly swarm any potential threat. They are most aggressive when the nest is disturbed or damaged.