I believe this is part of the system that hit Central Texas (Comal, Guadalupe, Gonzales and Bexar Counties) earlier this week. We experienced up to 11 inches of rainfall in less than 3 hours in parts of Comal County. See
this link for a local news article, which also links to some reader submitted photos at the bottom.
I'm sorry to hear so many have lost their lives, last I heard, only 1 death was related to this storm in Texas.