Good ole transition zone..
Turning attention to eastern Lake Ontario region, after a period of
more widespread light snow later Tuesday morning into early
Tuesday afternoon, expect lake enhanced snows to redevelop east
of Lake Ontario later Tuesday and Tuesday night. With a cap
rising to at least 10k ft and strong west-southwest convergent
flow pointed at central and northern Tug Hill region, amounts
over a foot look likely in those areas from late Tuesday
afternoon through late Tuesday night. Winds becoming more west-
northwest later Tuesday night will eventually make this band
more transient. Away from the Tug Hill, expect snow totals in
the 3-6 inch range. West winds gusting over 30 mph and temps in
the 20s will result in better chance of blowing snow and reduced
visibility in open areas east of Lake Ontario later Tuesday
into Tuesday night. Lower temps will also allow even the lower
elevations to see accumulating snow unlike what occurred during
the last heavy lake enhanced snow event this past weekend.
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.SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/...
Potent upstream shortwave trough swings through the eastern Great
Lakes early Wednesday morning. With its passage, veering wind flow
to the northwest will shove lake snows off both lakes to the south.
Deep synoptic moisture to start the period will then gradually
deplete as the shortwave trough advances east with lake snows
weakening by Wednesday afternoon. With the moving bands and shorter
fetch of the lakes, accumulations will likely be limited to an inch
or two, possibly a bit more near the southeast end of Lake Ontario
where 3 to 4 inches will be possible. By late Wednesday afternoon,
falling equilibrium levels and the incoming surface ridge will
further suppress snowfall accumulations. Winds will also be in the
process of backing to the west by Wednesday evening and then to the
southwest Wednesday night. Although weak, there may be just enough
support left to produce some minor accumulations as a lake snow band
lifts north into and across the Buffalo Metro area.
Wednesday night, any remaining lake snows will end as H850T warm and
inversion heights fall. Later on, a warm front will then track
northeast across the eastern Great Lakes, which might produce some
minor accumulations as we head into Thursday.