Be safe. I heard and read about the massive flooding these past few days. I have a cousin who lives in San Antonio, though I'm not sure if her area is affected. She and her family are out of the country right now. I was watching the news last night, and one of the evacuation sites (George R. Brown Convention Center) had exceeded the capacity. Some don't have a place to sleep due to a shortage of cots. Now's a good time to donate to the Red Cross.
Do not donate to the Red Cross. Very little of that money will ever help anyone in Houston.
The city of Houston has established a relief fund, which you can donate to here.
Donate to food banks: Houston and Corpus Christi.
To help pets displaced by flooding: Houston Humane Society and San Antonio HS.
Donate to Global Giving's Houston relief fund. That money goes directly to providing things first responders and victims need right now, and will support further relief efforts as funds allow.