And mandatory evacuations, officials in houston say the situation remains very dangerous as they prioritize rescues. >> especially seniors, those with disabilities, those in life threatening situations. >> 66,911 calls overwhelming the system with at least 2,000 residents evacuated so far by air in both. thousands more seeking a dry escape. >> the roof got wet, the attic got wet, the top door got wet. it just pancaked. >> federal assault -- 30,000 more may need it. this facility inside houston's downtown convention center could soon approach capacity. >> i plan on staying here until that time ...