(pasted snip from KHOU local weather forum)
Timing is a bit sketchy this far out, as we still don't know what kind of airmass is coming down and when it'll be on the move. However, I'd estimate that the front may reach the Dallas area Sunday night or early Monday morning and the Houston area by Monday night/Tuesday morning.
Interesting that the Houston NWS office is totally buying the GFS solution from overnight and calling for nice warm weather all next week. I certainly don't see any major cold for us next week, the upper flow and lack of snow to the north should keep us from breaking any records. But we could see highs closer to 40 next Tue-Thu. Just enough to be miserable.
Actually, it isn't all bad if we have temps near/below 40 and dry surface air, and can keep advecting cool/dry air down while over-running precip sets up. If we can evaporatively cool to just below freezing, miss work/school, and not damage/kill my more cold sensitive plants (the orange tree, the pygmy date palm), then it would actually be a huge silver lining.