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Wintry January 8-9 Wintery Weather Potential!

Chris Justice thinking for those interested


SNOW UPDATE: Not much has changed in my thinking on our two snow potential’s over the next week. First, Thursday and Friday looks like a decent snow for the North Carolina mountains, several inches and travel troubles are likely. For the upstate, temperatures are very borderline. I always proceed with caution in these type of events without a lot of cold air in place beforehand. Basically the atmosphere will be relying on rain to cool down. Because this is moving in during the overnight hours, I do think we could get to near freezing in locations around I-85, northbound. this includes many populated areas of the upstate including downtown Greenville, Greer and Spartanburg northbound. Areas south, have lower elevations and slightly warmer temperatures where rain looks more likely. The computer models are going to jump all over the place over the next 24 hours but as I meteorologist it is my job to diagnose the entire pattern not jump on board each model. For example the latest European model overnight tracked the low pressure over the North Carolina / South Carolina state line. This made for much less snow and warmer air for the upstate. While the previous run tracked along the I-20 Corridor and hammered the upstate with snow. The answer is found somewhere in between. When I look at the multiple different runs of the European called the ensembles, each have different starting conditions and parameters… Almost all of them end up with some Snow along the I-85 corridor, north toward the mountains. By the way, this is the first of two systems we are tracking. Colder air looks to be in place when the second one arrives on Monday and that could mean another chance for snow in some areas that did not get it this first storm. Stay tuned! I will have a full breakdown this afternoon with new model data starting on WYFF News 4 at four, five, six and 11 PM.


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QPF spread for AVL still wide...would be great for you guys to get into the .8-1"+ qpf.

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I expect that it will be for AVL. It get's dry slotted quite a bit. I am between KAVL and the Southern Escarpment, on the other side of Pisgah. That seems to be an area the models are picking up on for this event, upsloping will help.
 
Well that nam run was something. Really dislike the trend of opening up aloft
Agreed but it stayed closed longer this run, maybe I'm too optimistic but I've seen the NAM do this before and will mishandle the ULL outside of 60 hrs.
 
Agreed but it stayed closed longer this run, maybe I'm too optimistic but I've seen the NAM do this before and will mishandle the ULL outside of 60 hrs.
As usual our area will be the last one to be figured out by the models, so many moving mesoscale parts in central and eastern NC. I am going to focus on the euro and Ukmet for now, then pay more attention to the NAM 48 hours and in
 
Was the ICON bad? I haven't seen any posts about it
 
Was the ICON bad? I haven't seen any posts about it
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Agreed but it stayed closed longer this run, maybe I'm too optimistic but I've seen the NAM do this before and will mishandle the ULL outside of 60 hrs.
The nam did have most of central nc starting as snow or rain quickly changing to snow
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But you can see the change over and was lurking on the backside of the band. How widespread and heavy that band is will be a big key for us. If it's a thick heavy band maybe we can drop a quick half inch to 2 inches on the front and maybe out perform the cooling aloft shown on the models and hold off the warm nose for an extra hour. A change to rain almost seems certain for the middle of the event
 
As usual our area will be the last one to be figured out by the models, so many moving mesoscale parts in central and eastern NC. I am going to focus on the euro and Ukmet for now, then pay more attention to the NAM 48 hours and in

The triangle area seems to be the hardest place to forecast winter weather. Always on the line of nothing at all or a good amount of snow. At least the Euro has been looking good for us.
 
Then on the back end the nam is showing a nice deformation band type feature rolling through but it doesn't cool the column quickly enough to change much of central nc back to snownamconus_ref_frzn_seus_fh78-84.gif
If we can stay closed aloft we are far more likely to see the rn/sn line collapse southeast and bring another shot of snow to the RDU and east areas as this ends. Still a lot of spread on how this could end up, all rain with just a few flakes or a 1-3 inch storm total snow and in between are still realistic scenarios. Really have to think from previous experience the initial shot produces the more widespread potentially over performing stuff while the back side may be more localized within a band while others change back to just a few flakes
 
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The nam did have most of central nc starting as snow or rain quickly changing to snow
View attachment 62989

But you can see the change over and was lurking on the backside of the band. How widespread and heavy that band is will be a big key for us. If it's a thick heavy band maybe we can drop a quick half inch to 2 inches on the front and maybe out perform the cooling aloft shown on the models and hold off the warm nose for an extra hour. A change to rain almost seems certain for the middle of the event
NAM looks wonky with the slp track/placement and precip distribution. Don't get me wrong, we're getting warm-nosed. But the alleged track on the NAM is close to really good for our area. I guess in the end, we're talking about the LR NAM, so it's kinda moot anyway.
 
i mean soundings aren't awful at 72, just warm at the surface but no awful warm nose (yet)
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NAM looks wonky with the slp track/placement and precip distribution. Don't get me wrong, we're getting warm-nosed. But the alleged track on the NAM is close to really good for our area. I guess in the end, we're talking about the LR NAM, so it's kinda moot anyway.
Agreed. These QPF distributions look really wonky on everything but the EPS to me. Even if it's rain, it should likely be more evenly distributed than what is showing - I can only assume convective feedback issues with the low transfer to the Gulf Stream is plaguing many of these runs. The biggest thing to focus on is the H5/H7/H85/SLP tracks and attendant frontogenesis.
 
I have a hard time seeing the surface being the limiting factor here (it may make accumulations tougher, but I don’t think it alone will result in rain). It rarely happens. A sneaky, unforecasted warm nose, on the other hand.....
 
GFS tried to warm the surface with pretty cold 850's and 925's over head with heavy precip rolling through. That doesn't seem right at all.
 
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