Rain showers are expected to transition over to snow late Saturday evening as colder air arrives. But how quickly this switchover happens will depend on the timing of the coldest air mass. Two main ingredients for snow include cold air and moisture. Early Saturday afternoon, we will have limited amounts of cold air, but better moisture content.
Surface temperatures will be in the 40s Saturday afternoon, not nearly cold enough for snow to fall. As a result, initial precipitation will arrive in the form of light to steady rain showers starting early Saturday afternoon.
Late in the evening, colder air will filter in from the Northwest, aiding to switch things over to snow. But moisture will slide mostly East of the area by this time, limiting precipitation rates. If we had both abundant moisture and cold air locked in place at the same time, we would see a more widespread snow potential.
As night falls, temperatures will drop into the mid-30s or lower. This will allow for the precipitation to make a switch over to a mixture of rain and snow or even all snow. This transition looks to begin after 6PM, likely switching to all snow by 10/11PM. Light slushy accumulations will be possible, mainly on grassy or elevated surfaces. But with the very warm ground, anything that sticks will not stay for long.
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