I should have some nice storms moving from east to west off the mountains and into most of the "Valley of the Sun" around dinner time tomorrow. This is going to be the 1st legit widespread Monsoon event of the season for the valley. I'm pretty sure there will be alerts in place by tomorrow morning.
This is precisely the case as my cousin lives 20 miles south and he barely sees any cicadas around. I was read somewhere that NW IL and esp around the west/northwest suburbs of Chicago are pretty much ground zero. Like you said, some neighborhoods have it bad while others don't. I'm wondering why that is....I recall, when I was a kid back in the 90's we had it pretty bad one summer. It had to have been 30+ years ago so within the 34 year (17 * 2) window and I lived in Des Plaines back then. Maybe those critters still have their main "home" down under the ground and haven't moved much.