Saw a map in the Bangkok Post today indicating that the entire Gulf coast south of, but not including, Nakhon Si Thammarat was considered a disaster area. There was mention of another 6 southern provinces being listed as well but I didn't catch if they mentioned any other by name.
We were in Hat Yai in November 2010 a few days after the floods hit and it was an absolute mess. Glad you were able to get out when you did.