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Later Wednesday and Wednesday night the deepening and elongating
surface low will bodily lift northeastward across our region...with
an attendant shot of moderate to possibly heavy rain out ahead of it
then giving way to lighter wraparound snows as progressively colder
air wraps into our region following its passage. Later in the night
the airmass looks to grow cold enough to support the development of
some lake enhanced or lake effect snow east or east-northeast of Lake
Erie...with the combination of this and the lighter synoptic snows
likely producing some minor accumulations by daybreak. Meanwhile...
the developing cold advection regime will help to send temperatures
back down into the mid to upper 20s across the far west...and to the
lower 30s across the Finger Lakes and North Country.

On Thursday the surface low will continue to make its way northeastward
across Quebec Province...while maintaining a deep cyclonic flow of much
colder air across our region that will feature 850 mb temps falling into
the negative mid teens. Within this environment...lingering wraparound
moisture and energy attendant to the main upper level trough will
promote at least a likelihood of some light snow pretty much everywhere...
while increasing lake effect/lake enhancement will also help to promote
better organized (and potentially significant) lake snows downwind of
the lakes. The above said...this far out in advance the available guidance
unsurprisingly continues to suggest a fair amount of uncertainty in
wind direction (and resultant lake band placement)...with the degree of
band organization that we might see also uncertain given the likelihood
of at least some disruption from strengthening late February diurnal
influences...which would tend to favor any lake bands becoming more
cellular and less organized at least for a time. With the above in mind...
have just continued to highlight the potential for headline-worthy lake
snows within the HWO for now. Otherwise temperatures will continue to
slowly fall given the ongoing cold air advection...with readings dropping
off into the 20s areawide by late in the day. Coupled with brisk west
winds...this will result in wind chills dipping into the teens.

&&

.LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/...
...Potentially significant lake effect snows late in the week...

By Thursday night, temperatures aloft will be plenty cold enough to
support lake effect snow with 850mb temperatures around -17C. There
also will be ample moisture in place with a mid-level low forecast
to slowly pass to our north before moving into southern Quebec
through Friday. Expect the steadiest lake snows to occur in the
Thursday night and Friday timeframe. The challenge is wind
direction, and this is where subtle model differences will lead to
big differences in the timing and location of snow. In general
terms, the best chance for lake effect snow will be in the snow
belts ENE of the lakes Thursday night. On Friday, a potential Lake
Huron connection and a more westerly flow suggests the heaviest
snows may be across the Tug Hill and areas east of Lake Ontario.
There is potential for more than a foot of snow at some locations,
but it may take several more model runs before there is ample
confidence in timing and location for headlines to be issued. Will
continue to discuss this potential in the HWO.

There will be less synoptic moisture as the mid level low moves
slowly eastward Friday night, but model guidance suggests a
secondary shortwave will pivot around the back of this either Friday
night or Saturday. This will provide a temporary moisture infusion.
Also, with a weaker synoptic flow there is more uncertainty in wind
direction, with a consensus suggesting a generally northwest flow
during the period. This would bring the steadiest snows southeast of
the lakes. This shortwave and associated moisture will exit to the
east Sunday, with lake snows diminishing. With 850mb temperatures
near -20c there still is a risk of tea-kettle type snows if a
convergent band develops Saturday night. Depending the exact wind
direction and timing of the second shortwave, it is possible that
significant lake effect snows will continue through Saturday night,
but these are likely to be more localized. One thing to note is that
the higher late February sun angle could disrupt banding during the
daytime hours
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4 minutes ago, rochesterdave said:

Weird that the primary hangs on and yet heavy snow? I don’t buy the exact depiction but I think we are looking at something intriguing to be sure

I was thinking the same thing. Looks like it may stall out and wrap cold air in from the southwest...which is definitely a possibility.

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Well my winter fix has been satisfied. Definitely my favorite trip ever to the Adirondacks. 30-50" of snow on our hikes up to the peaks. Winds at the top of the one peak had to be over 80 mph. By far the strongest winds I have ever experienced in my life, nothing comes even close. We did a sunrise hike the first day.

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