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Christmas Miracle 2017


mitchnick

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The NAVGEM, if u believe it, is probably least progressive with the front of all current ops and has light snow for DC most of Monday morning while kiddos rip open their presents. Did something similar Dec 9 in leading the way to a NW trend at 96ish hours out. Repeat? Could the NAVGEM be that one whistle-blower model for this season? We can dream, right?

 

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Nice disco from Mount Holly this morning on the Xmas miracle-

A strong/digging vort max will reach the base
of the longwave trough in the central U.S. Sunday night, which will
promote wave development along the slowing front in the southeastern
U.S. As the vort max lifts northeastward, very favorable jet
coupling should occur, promoting rapid cyclogenesis along the East
Coast Christmas Eve and Christmas Day. Though the specifics
regarding this system remain elusive thanks to considerable
operational/ensemble model spread, the progressive look of the GFS
looks unlikely given the overall amplified look to the flow
(furthermore, this also is a common bias it exhibits). The CMC is
middle-of-the-road, but the western look of the 00Z ECMWF is favored
given more consistency and pattern recognition. Notably, the
CMC/ECMWF have very similar QPF fields as the cyclone races
northeastward; instead, the disagreement looks primarily based on
phase/spatial discrepancies.

With the above in mind, think there is a reasonable chance for
precipitation Sunday night and Monday morning across the area, with
chances for snow, especially northwest of I-95. With model spread
this large, the details are not at all clear (nor worth discussing
at length at this point). Given its timing and potential impacts, it
is obviously worth staying tuned to the latest forecasts.
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LWX much less impressed at this time for late Sunday night/early Monday based on their discussion.  Time for trending I suppose.  My zone went from a happy 50% chance of snow to RA/SN 30%...not very festive...but not unexpected.  yet somehow I still see the potential based on what is shown at 500mb.  4.5 days...lets see   

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4 minutes ago, BristowWx said:

LWX much less impressed at this time for late Sunday night/early Monday based on their discussion.  Time for trending I suppose.  My zone went from a happy 50% chance of snow to RA/SN 30%...not very festive...but not unexpected.  yet somehow I still see the potential based on what is shown at 500mb.  4.5 days...lets see   

Maybe that discussion was based on prior models runs?  Don't get me wrong.  I know that pro mets don't jump in and out with each model run, but 6z looks better, and if 12z looks better too, then maybe they will be more bull'ish again.

All in all, I think the lwx office has done a great job with the winter events that we've had this month.

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4 minutes ago, BristowWx said:

LWX much less impressed at this time for late Sunday night/early Monday based on their discussion.  Time for trending I suppose.  My zone went from a happy 50% chance of snow to RA/SN 30%...not very festive...but not unexpected.  yet somehow I still see the potential based on what is shown at 500mb.  4.5 days...lets see   

My forecast is now 50% chance of rain-snow > snow for Sunday night. Mount Holly is a tad more bullish. My gut feeling is we do see some decent coastal development but it will be probably a bit too late for our general area. Better chances for Philly N & E.

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26 minutes ago, C.A.P.E. said:

My forecast is now 50% chance of rain-snow > snow for Sunday night. Mount Holly is a tad more bullish. My gut feeling is we do see some decent coastal development but it will be probably a bit too late for our general area. Better chances for Philly N & E.

I hope we all can get it...make for great story we will remember...6z gives everyone love which is rare. 

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This doesn't have the potential to be a big event either way, but I think there's still potential for at least mood flakes and maybe a light accumulation, particularly for the northern portion of the subforum. Last night's Euro and EPS trended southward a bit from where the low hops to the coast, which is friendlier to us. It's more of a Miller B look than a southern stream wave riding up the coast on those two and the GGEM.  We know how those usually work out, hence why I don't think even best case this is a big deal.  But if we can keep pulling it south a bit, maybe we can back into a light event.  

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