"All our other outbreaks tend to happen in the springtime. So the ones in November tend to be single events, but this is by far the biggest number that we've seen in November."
Angel also says in recent years, the state has seen more "cold weather" tornadoes. He points to a February 2012 storm in Harrisburg that killed eight people. That was classified as an EF-4 tornado, the second most powerful. Two of the tornadoes this past weekend were also EF-4.
Those are rare in the state, but they have accounted for the most deaths, according to the weather statistics. Six people died in Illinois Sunday.