Tonight there’s a weather alert on for this part of Illinois warning the citizenry of a “pneumonia front”. Temperatures will drop from the 70s to the 40s(!) as it passes through. We had a party here earlier today, and I think I took the trash out shortly after, or before, the front passed through. I noticed it was quite a lot cooler than earlier, but I don’t think it was down to the 40s at that time. Still, interesting.
Also interesting is the Wikipedia entry for Pneumonia Front, created today. It looks, from some cursory Googling, like this is the first many people have heard of this thing called a Pneumonia Front.
The content of the announcement follows.