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12/29 - New Years Storm Threat Discussion


Dsnowx53

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The 12z GGEM is probably the biggest hit left on the table. Still time for things to change though.

No. The entire 12z suite has almost the exact same precip now (using NYC as the center point):

12z GGEM: 8mm

12z UKIE: 8mm

12z GFS: 7mm

12z Euro: 6-8mm

SREFS: similar

A major model concensus at this point.

12z NAM is the driest with only about 4mm.

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Euro was definitely an outlier. It was hard to digest the past two runs of the GFS being so far off. In the end, it's still a 1-3 or 2-4 event. No big deal given at best, Euro would have been 6-8 in. for most on the board. SREF's still going strong for a nice 2-4 inch swatch of snow from SW to NE.

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No. The entire 12z suite has almost the exact same precip now:

12z GGEM: 8mm

12z UKIE: 8mm

12z GFS: 7mm

12z Euro: 6-8mm

A major model concensus at this point.

12z NAM is the driest with only about 4mm.

I'm surprised about the GGEM totals. Looks like it's coming down fairly hard for at least six hours or so.

I_nw_g1_EST_2012122712_053.png

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It has seemed unusually erratic this winter. Not sure what is causing it.

The ensembles have been great, though. If there are any really amped members, then any given OP run can and sometimes will have the physical "room" to show one of those amped solutions. It does seem though that the OP has been more prone than usual lately in showing a solution on the "extreme" side of its ensembles.

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This is a case where if the coastal low isnt gonna go big we'd rather it does not go at all. In that scenario we could get hit well from the northern stream vort, sometimes those things can surprise you.

You can really see that on the qpf maps from the 12z euro run today.

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