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Upstate/Eastern New York


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30:1 or greater ratios!

The deepest cold air and best moisture
helped along by upstream connection to eastern Lake Superior and
Lake Huron will advect across Lake Ontario tonight through Thursday
morning, when lake induced equilibrium levels rise to 8-10K feet and
all the lake convective layer within the DGZ will result in an
increased fluff factor as SLRs in stronger snow bands will likely
exceed 30:1.

Back to Lake Ontario lake effect...boundary layer flow becomes
better aligned by later this evening, and moisture will improve
again over the lake. As alluded to already, upstream connection is
present from the far reaches of the Upper Great Lakes thanks to
limited ice this season on Lake Superior. This connection already
shows up nicely in satellite imagery. Upstream connecting flow and
favorable thermodynamics suggest loosely organized band early this
evening should intensify later this evening and certainly overnight,
supporting 1-2 inch per hour (perhaps higher) snowfall rates. As it
has looked for a while, intensity of the band and snow rates will be
capable of supporting warning criteria snowfall. Main uncertainty
continues to revolve around if the band can stay in one location
long enough as it will oscillate north and south at least a couple
times through the night before settling farther south on Thursday
morning with arrival of stronger cold front shifting winds to the
northwest.

Even though there remains uncertainty on the exact amounts (we`ll
keep a general range of 6-10 inches for now, though at least locally
that may be conservative), there is good agreement from all the high
resolution models that one or maybe two stronger bands will impact
portions of northern Wayne, northern Cayuga and southern Oswego
county later tonight into Thursday morning. When under heart of
these stronger bands, the ideal thermodynamic profile shown by
forecast soundings of strongest lift occurring in the DGZ will
result in snowfall rates likely over 2 inches per hour with
associated vsby as low as one-quarter mile. Though there is still
uncertainty in how long these bands will become parked over one
area, impact from heavy snow and low visibility and fact that these
impacts will persist through the Thursday morning commute, including
the NY State Thruway and I-81 corridor over Oswego county justified
going with lake effect snow warning for all the counties that were
previously in the watch. Coordinated this with BGM and ALY.

Passage of stronger cold front around daybreak Thursday will move
the stronger band more south along more of the Lake Ontario shore.
Possible that as the band pushes onshore, a quick burst of snow may
extend back westward along the lakeshore even into the Rochester
area. Even if that does not occur, should see several inches of snow
along the lakeshore into northeast portions of Monroe county near
Irondequoit Bay and this will impact the Thursday morning commute,
so will go ahead and buffer the warning to the east with an advisory
for Monroe county.
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22 minutes ago, SouthBuffaloSteve said:

No point in getting your hopes up this far out... GFS has put that storm anywhere from Chicago to off the Maine coast today.  $5 the 0z has it cutting up through Michigan.  

I know. Long-range models show this storm track over the Appalachians many times and it happens like 1 in 100. My guess is it goes well east as this looks like some kind of Miller B.

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