Tornados in January?

Last night we had an ENORMOUS thunderstorm. The thunder was nonstop for hours and hours, and the rain continued all night -- we got about five inches of rain overall. We were also under a tornado warning for much of the evening, which is pretty unheard of for central Illinois in early January. There is a nearby school district who had to cancel school today because of flooding. It has been unseasonably warm the past couple of days (mid 50's), so we got this rain instead of snow. Good thing, too -- they said on the radio this morning that if it had been snow instead, we would have about 40 inches on the ground. No, thank you!