I was out mowing the lawn at my parents' place one day on a Wednesday afternoon in late July of that year, and the strangest thing happened to me that I had absolutely no explanation for at the time. I cannot describe the sensation any other way than to say that I was suddenly afraid of the sky. The weather seemed entirely fine by all appearances, with only a smattering of clouds in the sky, but all I wanted to do was just abandon the lawn mower right where it was and get inside. Of course, intellectually I knew it was absurd to be afraid of the sky, and I pushed aside the feelings and finished my task, but it was still the strangest sensation I think I had ever felt, and if mowing the lawn had required more concentration, I probably would not have been able to finish it on account of being so distracted
Some 48 hours later or so, the largest tornado that had ever been seen in that area until that time ripped through the city, killing more than 2 dozen people, destroying several hundred homes, and doing hundreds of millions of dollars in damages. I remember when I was taking the bus the next day to where I worked at the time, I went by one of the areas where the tornado had touched down and the devastation was unlike anything I had ever seen in my life prior to that point.
I often wondered since that event, however, if what I was interpreting as being "afraid of the sky" only a couple of days before was some sort of survival instinct that was trying to kick in... to get me out of harms way, even though I did not know exactly what that harm was. Certainly it would be no surprise to me at all if many animals might happen to possess something similar, and lacking the intellectual reasoning of a human who could discard such a sensation on a rational basis, as I did at the time, would instead surrender their actions to doing whatever those feelings are telling them to do, and get the bloody hell out of the area.