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Winter 2022-2023 | Discussion and Outlooks


NKYSnowLover

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3 hours ago, Ohiobuckeye45 said:

There's no SE ridge on the GEFS like there was the OP, which is the main driver in variability 

gfs_z500_mslp_us_48.png

gfs-ens_z500_mslp_us_48.png

This is when ensemble map with spread can help.

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Ensembles generally smooth out the flow, especially at longer lead times.  I think what's happening is it's still a dump west and bleed east pattern being shown.

  The timing and amplitude differences make the longwave trof over the CONUS look like broad "U".  But looking at the spread in the ensembles, it could well be more of a "W" shadow in reality, with some weak ridging centered nearer the GOMEX with a deeper trof in the west, and ejecting shortwaves traversing the ridging (as we are seeing now), a trof in the west and SE with baby ridging bubbling up betwixt, or most optimistically for snow fans, the longwave progress through, and you get a big storm.

    The longwave will likely set back up out west (my opinion) to reload (if it ejects wholesale a la the 8/0z ECMWF).  Or is it more anchored like the 8/0z GFS, with a shorter reload time, but weaker systems trying to move through a longwave eastern/west Atlantic ridge.

I know these aren't hour 300 like the ensemble with spread, but I think it kind of helps define the envelope of solutions.

ECMWF

ecmwf_z500a_namer_fh120-204.gif.ce4274a3cd67b1671920a07e79c19c7a.gif

GFS

gfs_z500a_namer_fh120-204.gif.ab94c1c903eaecb447121256b9efc258.gif

A lot like like it's riding on how ridging near Alaska and the Yukon territory behaves.  With it's high amplitude, they can prone to anti cyclonic wave breaking, shown by both models with expected amplitude and spatiotemporal differences leading to the disparate solutions.  These wave breaks are notoriously hard to pin down, especially being in high latitude, data poor regions.

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There appears to be good snow west of the continental divide, but as a whole, northern hemisphere show is rather middling.

Screenshot_20221207-180701.png.d28ebb3a552fb171add4f3fe1d2b1abe.png

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The Chukchi Sea ice (what there is) is really taking a beating from ridging over Alaska. Looks like virtually no ice NW of Alaska until you get closer to Wrangel Island.  It's a chicken or the egg argument about this open water assisting in the ridging, or a result of.

ezgif-3-730d234f11.gif.1b4d64fc26e9a91c83579e4f483a6c2b.gif

 

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5 minutes ago, Ohiobuckeye45 said:

the system with the cold front on the 16th stays closed off substantially longer than prior runs on the 12z GFS. impacts TBD

 

 

gfs_z500_mslp_us_fh192_trend.gif

Keeps it slower moving and south long enough to pop a secondary for an interior NE storm 

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