I’m still hesitant to go there after the Christmas snow threat flopped so badly, but as has been mentioned a couple of times now in the past few days, there is a lot of potential for a Southeast snowstorm next week, and a lot of indicators that such a storm will try to develop.
As I mentioned earlier this week, you won’t hear much chatter about it because the GFS computer model isn’t showing it. But the 0z and 6z runs of the GFS this morning have shown it—albeit not too much of a threat for our area—so the chatter is likely to begin over the next day or two if those trends hold.
The time frame we’re looking at is Jan. 7-8. The situation we’re looking at is a low pressure system pushing through the Deep South, right along the Gulf of Mexico, with cold air in place across much of the region. It’s way too far out to try to nail down location and details, but the important thing is that most of the notable global models—including the GFS and the ECMWF that are so heavily relied upon—have a storm developing. My untrained opinion has been and remains that if this storm develops, it may end up being a Deep South snowstorm that misses Tennessee, for the most part. The GFS is showing exactly that, with the 0z run showing 2-3″ of snow for us and the 6z run showing virtually nothing. But, my untrained opinion is also that things are improving that could allow this storm to track a little further to the north.
The most important thing as we look at this storm seven days in advance is that it is an entirely plausible scenario. Many times, winter storms show up on the long-range models a week or more in advance and they really don’t look plausible. This one does. The 0z GFS in particular shows the Pacific North American (PNA) ridge coming alive, with blocking all the way up the coast to Alaska. That, in turn would allow a piece of energy to slide down the Rockies to Texas, where it would begin to take on its shape as a bonafide storm, then tap Gulf moisture and overrun colder air that is in place. That’s a classic winter storm setup for the Southeastern U.S.
As for location, past runs of the GFS have been showing us very cold throughout the extended period. The reality is that it probably won’t snow in East Tennessee if we’re as cold as the GFS has been depicting. Not that it can’t, but it is unusual. But what the GFS is beginning to show now is the various upper atmosphere features to our north beginning to relax a little, allowing the trough that is going to move into place this weekend and deliver us cold temperatures for the next several days to also relax, and that is what could open the door for this storm to travel further north than is currently being depicted and become East Tennessee’s first significant snowstorm of the 2009-2010 winter season.
Lots of ifs and buts in there…the models may very well have the proper placement and strength of this system already locked down; it may impact areas to our south and not impact us at all. Or the trough may strengthen enough to push the thing all the way into the Gulf of Mexico. Or it may not develop at all…or any number of other things could happen. We are talking winter weather in the Southeast, after all. But it will be interesting to watch and see if it all comes together.

January began with news that our unemployment rate in Scott County
March brought a
In June, Robbins school board member Bradford Zachary
More peaceful times were ahead for July, as firefighters in Huntsville
October