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Winter 2024/2025 December Thread


AMZ8990
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2 minutes ago, Carvers Gap said:

In the longer range, this is kind of what I am monitoring.  I "think" that if the first half of January goes cold, we might be looking at some colder analogs going forward from their.  95-96"(light version) is an analog which is working well of late.  I am NOT calling for that kind of winter.  But I wouldn't rule out something like this...a couple more cold shots, warm-up around Christmas, step down cold through the third week of Jan, thaw, early Feb cold, warm last half of Feb, and then March cools back down.  January looks a lot like this on the Euro Weeklies w/ some ridging bellying underneath from the southwest.  My guess is that we see a pretty variable pattern which normally works well here during January.

485f272d-f529-4495-a724-16abd4ff90ce.png

 

 

Yeah, they look to want to make a - EPO pretty much a Staple. That correlates with the Nina PAC Ridge being further East than typical Nina Climo. Makes sense given the SST Structure out there now imo. + TNH would be pretty prevalent with possible over the pole ridging at times. CPF would be likely at higher than average intervals. The +QBO is probably why no real blocking is being advertised. 

   Strange in that you generally want a -AO for a cold Winter but, with the right setup, a positive AO in Tandem with a -EPO and tall PNA Ridge can deliver strong CPF. 

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5 minutes ago, Carvers Gap said:

This may well be cold chasing rain.  However, if the low backs a little due that leeside low which is showing up on short range modeling, I could see higher elevations on the Plateau, SE KY, SW VA, and areas above 2000' in E TN doing OK.  Morristown seems to have a knack for scoring lately.  My inlaws live there, and they often do as well as we do in NE TN!

That’s cool they live here in Motown! The city in general sits at around 1,350ft. However there are many areas above 1500’. Fun fact about Hamblen Co., the highest point is actually in the middle of town on Crockett’s Ridge. It sits just under 2,000ft at 1,952ft. At that elevation, they definitely get more snow during events, and I’ve seen it where only the last 150-200ft had snow and the rest had nothing.

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RGEM is getting even more moisture back across the Apps for tomorrow AM now, but seems to see the cold air struggling to make it over the plateau. NAM was trending toward more moisture, but is keeping the deep stuff east of Morristown at 6z

I think RGEM and Euro AIFS win this one wrt moisture. Both were going to town on this idea for a while.

Biggest problem I see now is that we're pretty deep in mild, moist air right now so I think the wait and see for cold air game is, as usual, a real threat. 

d0xIUbS.pngNot pretty for a "waiting on the cold air" situation.

Fortunately timing is about as good as it can get, early AM Wed, so the sme model above, shows the below: 

The Bastardi algorithm is much more optimistic for MBY than the Levi Cohen algorithm:

giphy.gif

Luckily all I have to do is wake up at my usual time and look out my window to see which turned out right. 

 

I think Cumberland county, John, anyone up near Wise or Harlan, KY have the best shot as of now. 100% chance John  and Cumberland Co change over to snow at least 45 minutes before me lol. 

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3 minutes ago, Carvers Gap said:

The 12z non-AI Euro with a really nice pass around the 21st.  I continue to like that timeframe.

 

Yeah now that a global has jumped on board I'm extremely interested in that timeframe.  I have found it best to pay attention when the Euro is the first global to sound the alarm.  

nice signal for the East Coast.

IMG_1305.thumb.png.eb77f3bb0d028454c147e4d7c5abc633.png
 

Tomorrow has turned more novelty than anything at this point. Daytime killing us on temps. Especially the valley.

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2 hours ago, John1122 said:

Looks like MRX is rolling with the NAM as a heavy favorite in the current modeling. The HRRR has been increasing potential totals steadily, with the RGEM being steadfast in a decent event.

Sure looks it but, hard to say for sure as last I spoke with them regarding what they use they said the NBM.

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RGEM and Euro AIFS for the win in my book with this one. 

Euro AIFS, last 26 runs, starting 186 hours out:

giphy.gif

RGEM's runs, starting 80ish hours out:

giphy.gif

 

Compare to the GFS 180 hours out:

giphy.gif

 

Euro from 140 hours out (couldn't get a gif further than that)

giphy.gif

and NAM from 84 hours:

giphy.gif

 

 

Looks to me like there was a progressive bias with this particular system. RGEM I think does better with big picture stuff, NAM and HRRR are better for localized precip. type issues and convective processes.  

0z Euro AIFS is still trying to honk on the system Carvers noted:

giphy.gif

It is still bouncing around a bit though, but hey its 10 days out. 

 

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