Looks to be a rear suspension issue to me as well. I don't know what the weather was like for you on Monday but the pressure also seems a bit low. I run Metzeler Racetecs at 32PSI cold and they were terrific all season except in colder weather where I would drop them to 30PSI cold.
I don't know what happened to this website, but maybe its down for maintenance.
Catalyst Reaction. Great pictures of tire wear and the probable causes.
www.feelthetrack.com