Yup, and the SPC was going off of the information that they had at the time which painted a pretty dire picture. But that stuff can change, just like it did today. It would be like having to place a million dollar bet on the UNC/Duke game four days before tip off. You place a bet based on information that Caleb Wilson is more than likely going to play, and then after the bet is locked in the news comes out that he broke his thumb and is out for the season. It sucks, but that's the way it works.
That said, they absolutely should not have closed schools today IMO. Even if the worst-case scenario had occurred and we had 79 F-5 tornados bulldozing the entire state, it is much safer for kids to be in a school than it is for them to be at home.