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Upstate/Eastern New York


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Good AFD from BUF:

By Thursday night, a fast-moving northern stream impulse diving
southeast from the northern Plains will interact with the southern
stream energy. There remains some amount of uncertainty as how this
interaction plays out, but guidance is trending towards a phased
solution as the northern stream impulse carves out a potent
shortwave trough that will become increasingly negatively-tilted.
Where and how this phasing exactly occurs will be critical to the
Thursday night into Friday forecast, as the surface low exits to
the southeast and gets absorbed into the coastal low with
colder air wrapping back in across the region.

The colder air will lead to a transition from rain to snow, with
confidence beginning to increase in widespread accumulations.
However, the exact amounts remain quite uncertain at this time.
The boundary layer will be slow to cool, limiting accumulation
efficiency, but will be counteracted by the impressive dynamical
cooling overspreading the region underneath the upper level
system. There may also be enhanced deformation and trowal
forcing within the systems cold conveyer belt possibly leading
to more efficient snow accumulation. A cooling northerly flow on
the back side of the system will also allow for some enhanced
amounts from lake response and upslope. At this stage of the
forecast, and based on uncertainty of how the upper level system
plays out, will maintain a conservative approach to this event.
But this system certainly bears watching over the next couple
of days.
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Interesting storm on the horizon...I like these high stakes storms - either 2" of rain followed by an inch of slush, or buried under 12"+.  I suppose out west here we always have the risk of less QPF, but seems pretty likely that someone in our area will get into heavy precip rates with that screaming moist easterly flow.  Me thinks someone might be in for quite a late winter treat...

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44 minutes ago, wolfie09 said:

30 miles could be the difference between a couple inches and a foot, still have nearly 72 hrs to figure this out..P&c now showing a slop event with r/s transitioning to rain on Friday..

Evolution of this will be complex and likely defy allowing a model consensus right up till game time I'd expect...probably will have to pick a solution that makes the most sense and even at that I think a March 2001 type debacle (surprise) is in the offing.  I think this area is in trouble with antecedent BL too warm and energy xfering to coastal. Easy to get caught somewhere in between.  I quickly looked at a Skew-T of 18z NAM at 60 hrs...precip panel showed snow falling but sfc was upper 30s (?)...that doesn't add up. Or it's white rain...I think low ratios are a real problem no matter what.

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12 minutes ago, Syrmax said:

00Z NAM looks interesting. Big -UVV at 700mb  ripping into CNY/WNY and sfc looks cold enough.  SNE caught in the mother of all dryslots.

We Toss.

That would be some intense snowfall rates with that. I would pay 100 bucks for the NAM to verify. If GFS stays on the warm train will be interesting to here the local mets in morning with their take.

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