We live in the northeast part of Rockford, IL, and a tornado formed near our house before it pounded the little town of Caledonia.
I had gone out to the post office, and noticed that the digital thermometer on my Explorer fluctuated wildly between near seventy, down to fifty, and back again several times.
Soon after I returned home, there was a serious blast of wind, so I went outside and tied down the grill cover while rain came in sideways. Then everything became deathly still. Shortly after that, the emergency sirens went off, but by that time the storm had left our area. There's a bit of a controversy about that system now. Our power went out for several hours and didn't come back on until well after dark. Many others were not so fortunate.
Here's a link to the article in this morning's Rockford paper.