radioman24, I don't work for the Post Office, but I would take a guess that your mail went through the big post office in Fort Worth on its way to the Houston area. Houston did not get hit, but Fort Worth/Dallas were locked up pretty bad from Thursday afternoon all the way until yesterday with ice on the roads. Temps have been below freezing (around 22 degrees) up until now. I travelled from Fort Worth to Brenham, and over to Houston today. Roads are all clear south of Fort Worth now. I would give it another day or two.
On edit, I talked to a lady mail carrier this afternoon (I'm in Pasadena, near Houston), and she said the mail is definitely running behind due to the snow/ice in Texas. She said that your mail probably went through Fort Worth, and that all mail goes to the North Houston station before being dispersed to the Houston metro area. Again, I think you should give it another day or two before really worrying too much.
73,
RT307