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December Medium/ Long Range


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3 hours ago, midatlanticweather said:

Serious question. A while back I felt the Euro was super strong in long range forecasting. When it showed stuff I felt pretty confident. Now both GFS and Euro seem less capable in the long range. Is this perception or real? Is it because we want much more specifics? It may be that the patterns I remember were easier to predict and the chaos the last several years have caused less confidence. Am I wrong? Probably. Short range, models have really gotten much better.. I think. Get to 5+ days and it is so inconsistent you can't rely on what we see at all.. Again, maybe it is due to so much recent instability 

Many people have shared this observation.  Usually our focus is in forecasting snow, and in that context I suspect that the pattern is a significant driver to the feeling of reduced accuracy.  For 8 years give or take we have been in a sort of semi-permanent La Nina which tends to mean northern-stream dominant.  And as we know those are inherently more difficult for NWP to handle.  If we ever get a canonical Nino response again it's possible that guidance may go back to more familiar levels of stability.

There's also the fact that for those 8 years, models have been less stable with predicting snow because, well, the patterns have not been conducive to snow.  i can remember several instances where the models stably predicted TORCH from 16 days out, and lo it came to pass (Jan 2020 is an example that comes to mind)

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3 minutes ago, WxUSAF said:

EPS and GEFS have a signal. Cold air availability is prime concern. 
 

Still crazy to me how Nino-like the pattern is the next couple weeks.

preview of next winter with colder air available lol

Dec 2024

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46 minutes ago, Weather Will said:

Big difference between EURO and GFS with MJO in terms of amplitude into Phase 6 for Christmas week.   If the GFS is correct, would think it will be on the warmer side.  If EURO is correct, maybe we can still thread the needle with a storm being cold enough...

IMG_4346.png

IMG_4347.png

GEFS has been too strong in recent weeks and having to correct weaker with the MJO consistently

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2 hours ago, Weather Will said:

Big difference between EURO and GFS with MJO in terms of amplitude into Phase 6 for Christmas week.   If the GFS is correct, would think it will be on the warmer side.  If EURO is correct, maybe we can still thread the needle with a storm being cold enough...

IMG_4346.png

IMG_4347.png

Depends in a La Nina Background state MJO phaase 6 is cold in the east. 

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3 minutes ago, 87storms said:


If we can’t snow with a trough-y East and a banana high up top, we’re in trouble.

Should work, but that's but one possible outcome from a single op run at hour 360, so we won't necessarily get the chance to find out lol. 

 

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