This is a wide area IR loop from LSU ESL.
You can see a front moving in to the Plains. A wave rotating through the Tennesee/ Ohio Valley. And another lighter impulse moving through LA/MS/AL.
I've seen at least 3 Tornado Warnings in Extreme Southern Texas this evening. Possibly associated with downsloping winds off the Sierra Oriental Range in Northern Mexicoand warm? moist air off of the GOM.

edit: Storms in South Texas appear to be more inline with an inverted trough and associated Low over the Midland,TX area.~danielw 0125Z