Last night around 1 am I heard a really loud sound -- it was sort of like thunder, but much louder and more sudden, and seemed to last for 10 seconds. I went onto Twitter and saw lots of other people heard it -- some folks said they were woken up and others said car alarms were set off in Bloomingdale and Shaw. It seemed awfully loud and long for thunder, and I was pretty disconcerted.
Anybody else hear it? Any idea what it was? To me it sounded like it came from the west, but that might just be due to my windows.