today was supposed to be the first day of school in houston city school. it has been postponed and called for more national guard. a case that is already drawing questions. dallas is going to open, quote, a mega shelter. there have been tornado warnings overnight and we may only be halfway done with the rain which is pretty unbelievable to think about. the warning from the national weather service was ominous. this event is unprecedented they said, and all impacts are unknown beyond anything experienc experienced. the national hurricane center said the houston area could see 50 inches of rain. we ll get bill karins weighing in in a moment. joining us live in victoria is nbc s kerry sanders. give us an update.