Based on the research I have done, the best organization for storm donations is The Salvation Army. I urge you do donate to them.
While you may have another opinion, I am not a fan of the Red Cross for disaster donations. There have been too many examples of diverting disaster donations to other purposes and similar irregularities for my taste. RC has a B+ rating from CharityWatch.com which, while not bad, is lower than some of the other charities I prefer.