Another mild day is in store for the Finger Lakes, but the weather will quickly change tonight due to a strong area of low pressure.
This low is starting the morning over the southern Plains and will track northeast today along a stalled out frontal boundary that stretches into New England.
This front is not as much of a divider of cold and warm air as it is a boundary between dry and moist air. A second cold front is lurking over the northern Great Lakes with much chillier air across the upper Mid West this morning.
As the day unfolds, the Finger Lakes will enjoy another warm day. Temperatures will probably not be quite as warm- no one is expected to reach 70º- but low 60s are a decent bet.
It will be a cloudy day though. There are also some areas of morning fog. Precipitation should hold off until after dark.
As the low tracks northeast and strengthens, it will start to draw the cold air over the Midwest into its circulation. This will start to happen at about the same time the precipitation moves into the Finger Lakes tonight. By Midnight, it will be cold enough for the rain to start changing to snow over western New York, with the rest of the region following suit as the precipitation pulls out over the next few hours.
The best chance for accumulating snow will be over western New York, where the cold air will arrive soonest. Further east- roughly east of I-81- the cold air will not arrive until after the majority of the precipitation has pulled away and only a few flurries are expected.
For snow totals, this will result in up to a couple of inches in some parts of western New York, an inch or so across most of the Finger Lakes, and less across the eastern parts of the region.
Temperatures over the weekend will mostly be in the 30s, though a few 40s may show up Saturday and Sunday afternoon.