obama will host a concussion summit at the white house today. 200 sports officials, medical experts, parents and young athletes will attend the meeting. the goal is to find new ways to identify, treat and prevent serious brain injuries, particularly in youth sports. this morning the houston area is under a serious flood threat after days of drenching rains forced rivers from their banks and left these cars -- look at that -- plowing through water they should not have been driving through. the big worry is the san jacinto river, which is getting closer to homes. houston has seen more than 7 inches of rain in recent days. >> whoa! >> indra petersons here bright and early for a look at the weather today. >> good morning! >> good morning, indra. >> good morning, everybody. yeah, we've been talking about all this rain in the south for so long, and there's a reason for that. we have, and we are still talking about it. take a look at this right now, the radar. all the lightning around louisiana, going into mississippi and even alabama. yes, the storm is still there, very slow to move. look at the rainfall they've already seen. we're talking about places like houston, almost 7 inches of rain, baton rouge almost 4 inches, victoria close to about 5 inches of rain, and we're not stopping there.