Wow dave that sounds horrible. Hope it warms up a little for you guys. South of houston we have not hit freezing yet, although looks like tuesday night we got a good shot.
As for mobilus comment about shortages I work in the retail grocery business and it is indeed causing a problem. Major beef and dairy suppliers for texas are located in and around dallas/ft worth and we have already seen major problems with trucks getting in/out of that area to the rest of the state. You probably will see some minor shortages on red meat and dairy products but nothing crazy or extended.