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Mid to long range discussion- 2025


wncsnow
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11 minutes ago, TARHEELPROGRAMMER88 said:

Just a few more runs and this is likely to be an all cold rain event. Wild swings though for sure. 

Not sure that's the case, both 12z GFS and Canadian actually developed the wedge stronger and deeper this run when compared to 6z, so if anything this run was colder.

gfs_T2m_seus_fh108_trend.gif

gem_T2m_seus_fh114_trend.gif

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I wouldn't be surprised to see this trend towards a more phased/cut off look given the strong cut off low over the northeast. This really slows down the flow and promotes phasing/cutoffs upstream. We haven't had a setup like this over the Atlantic in many years. The only issue is we don't have a major/classic CAD setup so we will run the risk of a change to rain outside of western NC. That said, the degree of cold air ahead of this system is pretty strong. Will be a fun one to track this week for sure.

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9 minutes ago, HKY_WX said:

I wouldn't be surprised to see this trend towards a more phased/cut off look given the strong cut off low over the northeast. This really slows down the flow and promotes phasing/cutoffs upstream. We haven't had a setup like this over the Atlantic in many years. The only issue is we don't have a major/classic CAD setup so we will run the risk of a change to rain outside of western NC. That said, the degree of cold air ahead of this system is pretty strong. Will be a fun one to track this week for sure.

As you can see below from this view. The Low over the Atlantic will force everything from Canada underneath it. Which increases the odds of a phase and large cutoff system. Could be great for us or could be not so great if we change to rain.

Blocking.png

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44 minutes ago, GaWx said:

12Z GFS 24 hour snow: significant increase over recent runs plus significant IP/ZR some areas

IMG_1628.thumb.png.0088613b3ce636097babfc7e5db59599.png

Granted I'm only looking at GFS, but it seems extreme NE GA (upper Lake Lanier to the intersection of GA/NC/SC) (selfishly the spot i look at) looks good even going back several runs, and trending even better each time.

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Just now, SnowDawg said:

H5 was improved on the GFS, I'll take that and move on to the next runs. Better phase with the northern energy improved the mid-level thermals and made the front end thump last longer. 

^this. I think a better phase/more amped system is needed to pull in cold air for snow. Track will dictate precip type but a full phase/stronger system with correct track looks like the only way we win in this setup

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2 minutes ago, NorthHillsWx said:

^this. I think a better phase/more amped system is needed to pull in cold air for snow. Track will dictate precip type but a full phase/stronger system with correct track looks like the only way we win in this setup

Yeah, I think I've mistakenly been hoping for a weaker system to reduce warm air advection, but all the weak runs are terrible. Stronger runs are pulling more cold air from nearby into the system. I'm fine with a messy winter storm, I mean that accounts for like 95% of our events, but I'd really like to score nicely on that front end before the mixing starts. GEFS also jumped considerably colder at 850 compared to 6z.

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We used to have a rule forecasting for ATL and it still applies today as the GFS wedge resolution still is not great that if the GFS could see a wedge beyond 72 hours in ATL you were in big trouble.  In this case it not only sees it but has it almost to the metro.  The CMC which tends to have better resolution on that feature has the mixed precip back into Bama

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Everyone breathe. There’s been no notable trend in models since yesterday other than everything has the storm now and suppression looks extremely unlikely. Pay attention to the lobes of energy moving around the western ridge and the phase with the Baja low. Also watch the antecedent airmass and H5. Really want a stronger HP over the Ohio valley/NE ahead of this system. There’s a good chance nothing resolves today or tomorrow but I expect by tomorrow we will see a trend developing in regards to the phase location and strength. Really hoping this one works out but still not sold given the variables 

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