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potential for a few mangled flakes part 3


earthlight

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I prefer rain to snow then snow to rain although the bust potential is greater in the former. Who wants to see beautiful snowfall will a nice blanket on the ground, trees, and streets turn into a dreary mess where it all disappears in a couple hours. At least with rain to snow, you get the mess first and see the beauty of snow afterward.

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gfs_namer_030_850_temp_mslp_precip.gif

18z GFS during the time of best dynamics looks warm from interstate 287 south and east. We haven't seen a storm where 287 was the classic rain / snow dividing line in some time.

Appears the slp is a bit weaker compared to the earlier runs.

Weaker low pressure leading to less dynamic cooling apparently.

My question is why is the GFS weakening the storm. GFS hinting on something other models don't see?

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Multiple reports from friends on FB that it is snowing at valley floor elevations (~800-1200 ft) in Virginia. It is coming folks.

dynamics will not always overcome a marginal BL, but this is a case where I think they most definitely will... we have seen many similar instances (just not in october) the past two winters, and this is no different. a BL temp of 34-35 is irrelevant if you're getting very heavy QPF/intense dynamics above.

I am so freakin' excited!

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dynamics will not always overcome a marginal BL, but this is a case where I think they most definitely will... we have seen many similar instances (just not in october) the past two winters, and this is no different. a BL temp of 34-35 is irrelevant if you're getting very heavy QPF coupled with unstable dynamics above.

I am so freakin' excited!

Me too. This is unreal. Always cool to be a part of history. This one is going in the books for the mid-Atlantic and Northeast.

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The GFS takes longer for the changeover since it's LLJ takes longer than the NAM to switch to more a more northerly direction.

But even the GFS gets the snow down to the coast at night though hitting the lower range of accumulation potential on the grass.

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If anyone missed Lee's forecast on channel 7:

http://abclocal.go.com/wabc/story?section=weather/forecast&id=7909127

I think he is spot on with a coating to a slusly inch at worst for NYC and the 3 inch lines runs from 287 NW.

He actually said a coating to a slushy inch or two. He's allowing for the possibility of 2 inches in NYC.

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This is where the upgraded and improved NAM and better high res models make forecasting these events much easier than 10 years ago or more. The 12/25/02 storm many have mentioned the only model that did pick up on heavy back end banding was the GFS, however; the GFS of course showed a boundary layer that was too mild. The then ETA did not pick up on anything nor do many of the other global models.

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This is where the upgraded and improved NAM and better high res models make forecasting these events much easier than 10 years ago or more. The 12/25/02 storm many have mentioned the only model that did pick up on heavy back end banding was the GFS, however; the GFS of course showed a boundary layer that was too mild. The then ETA did not pick up on anything nor do many of the other global models.

Seems like the 18z GFS after a good amount of rain on the front end of the system, drops 1-1.2" QPF mostly as wet snow/snow over N/C NJ and NYC. If ratios are in the 5:1 vicinity, 3-6" (maybe a touch more some areas) per this run seems doable.

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