Some lake effect potential behind the CF..
Cold air advection will continue Tuesday night as another cold front
crosses the region, reinforcing the cold air advection, this will
cause 850H temperatures to drop to the -12C to -15C range by
Wednesday morning. With the cold air advection and some synoptic
moisture still available, a lake response will begin downwind of the
lakes. As of right now, snow looks like it should be light through
Tuesday night into early Wednesday morning before additional cold
air advection and an approaching trough for later Wednesday.
Temperatures on Tuesday night will be in the low to mid 20s, with a
few locations east of Lake Ontario in the teens.
&&
.LONG TERM /WEDNESDAY THROUGH SUNDAY/...
Wednesday through Thursday a broad longwave trough will become
established from the Great Lakes to New England. This will bring a
few days of below normal temperatures to our region, with Thursday
likely being the coldest day. General WNW flow aloft will combine
with increased lake instability to produce a few rounds of lake
effect snow showers east and southeast of the lakes. It remains too
early for any details, although the pattern would suggest a better
potential for accumulating lake snows southeast of Lake Ontario,
with a lesser potential off Lake Erie. The best setup appears to be
Wednesday night through Thursday morning, when an upstream
connection to Lake Huron may tie into the Lake Ontario band.
Lake effect snow showers will continue through Thursday night
southeast of the lakes. High pressure and the onset of warm
advection will then bring an end to the lake snows by Friday, with
the start of a warming trend and period of dry weather that will
likely continue into next weekend.