In southeast Texas, there isn't normally much cause for alarm when it is suggested we might get some "winter weather." For us, that normally means it might reach the freezing point, probably in the middle of the night when we are asleep with the heater set to 72. But, on that rare occasion when we do get some winter weather, it almost never involves precipitation. For those who have lived here their whole lives, in some parts of the country, they get what is referred to as "frozen precipitation" in the form of sleet, freezing rain and even this magical thing called snow.
No one in Houston should be getting their hopes up for a winter wonderland this week, but a slim chance does exist that we could see some freezing precipitation towards the end of the week thanks to another potential polar vortex moving across the midwestern U.S. (insert dumb crack about how Global Warming clearly doesn't exist here). While it is unlikely we'll see our temperatures drop into the 20s like the last serious blast of cold air, we could get down around freezing and we may still have some moisture in the atmosphere which COULD lead to some freezing rain or sleet.
Of course, the ground will be too warm for anything to stick, but we can dream. As Jim Carrey said in Dumb and Dumber, "So, you're sayin' there's a chance!"
For most of the week leading up to Friday, expect cool temperatures with highs in the upper 50s and lower 60s and lows in the upper 30s to low 40s. It's Thursday night into Friday morning that presents the greatest chance for rain. By Thursday night, the entire region could be in the upper 20s to around 30 degrees, not a hard freeze, but cold enough to generate some freezing precipitation given the fact that there is a good chance of light rain through Thursday night.
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By Friday, skies will clear and we probably won't make it out of the 30s for highs, but lows won't drop below freezing. Just like the last cold blast, temps should rebound quickly with highs by Sunday in the mid 60s ahead of yet another cool front.