Snow Monday night and into Tuesday will be on the minor side, with
just an inch or two Monday night, and an additional 1 -3 inches
Tuesday. As the inverted trough passes us Tuesday, precipitation
will taper off from west to east behind its passage. Colder air will
then flow over the Eastern Great Lakes later Tuesday and into
Tuesday night, with temperatures at 850 hPa falling down to around
-12 to -14C. This will result in lake effect snow forming, to
the east of the Lakes. Winds may back enough ahead of another
surface trough late Tuesday night to bring snows as far north as
Buffalo, while to the east of Lake Ontario a long westerly fetch
over Lake Ontario will primarily orient the band of lake effect snow
Tuesday afternoon and night towards the Tug Hill. While inversion
heights will rise to over 10K feet east of both Lakes, and low level
lapse rates increase to over 8 C/km moisture will again be marginal
for heavy lake effect snowbands to form. Also 850 hPa low does not
really close off, but rather is just a passing upper level
trough...which can lead to oscillating bands of snow. As a result,
snow maximums east of both lakes may just end up low - mid advisory
range.