EDIT at 8:55 PM CDT (5/16): Severe weather report graphic was replaced.
This has, in fact, happened before. Let's take a look. Here is what happened in the 500mb level on Saturday, April 14.
Severe weather reports do indicate that a tornado outbreak did occur (or a few cells with long tornadoes), and this could indeed happen again. The details will have to be worked out at a later date, however.
Now, let's take a look to what the FIM is showing going into the 27th of May.
Props to the AccuWeather Forums for their extensive knowledge on the subject.