If you are interested in helping, the Volunteer Center of North Texas asks you visit their website to register to become a disaster volunteer and they will notify you if needed. You can register at http://www.vcnt.org/volunteers_disaster_relief.html.
In hard hit Forney, TX, volunteers are meeting at Mustang Creek Community Church, 13851 FM Road 548, or the Forney Police Command Center at FM 548 and Ridgecrest Road. Of course, if you are coming from out-of-town, you will have to find your own housing and transportation. And don't forget to bring hats, gloves, sunscreen, and water for your own comfort too.
If you can't make it to Texas, you can make a $10 donation to the Red Cross by texting "REDCROSS" to 90999.