My only problem with the BDL number is that historically HFD has averaged warmer Julys than them in the ASOS era. Now, low and behold, we have BDL pulling off a warmer month than them. Maybe it's legit, but things that make you go hmmm...
I have some liquid permethrin, but I've read that will take a couple of minutes to kill them...sounds like a recipe for getting stung while waiting for them to die. My sister is allergic to yellowjacket stings, but I've never been stung. I'm not too excited to jump in there.
Definitely not bumblebees and pretty sure not yellowjackets. Had more of a subtle yellow/black abdomen and not the vibrant yellow of a yellowjacket. I'll try to get a pic today.