The NWS in Norman has an entire page dedicated to both the May 19, 2013 and May 20, 2013 tornado outbreaks. If there isn't sufficient evidence there, you can always use DAT:
ArcGIS Web Application
Go to the top right and enter in the dates (I would go a day early and maybe several days later as survey dates can vary sometimes, depending on offices), then you should see all the tracks for the Shawnee EF4, Carney EF3, Moore EF5, Edmond EF1. Some damage indicators do have photographs attached to them from the survey showing the degree of damage that occurred at that point along with a description of how they arrived at such rating.
NWS Norman:
The Tornado Outbreak of May 19, 2013
For what it is worth, the NWS page seems to be having some issues today, so I would perhaps just keep trying it. It has been slow for me all day.
Authors edit: I just now realized looking back at DAT, how close Shawnee, OK came to complete disaster on 5/19/13. Survey data shows estimated wind speeds of 190 mph just NW of town in some of the worst damage areas. If this had been a tad further SE, I think it would have been a far worse outcome, even worse than what occurred. Of course this was overshadowed by the next day's horror in Moore, OK.
View attachment 23102