I've had a fever the past few days, so it's entirely likely I'm doing something dumb, but isn't this the forecast you're seeing? (It's what I see when I click on your link.)
Or, in graph view form:
Based on that forecast, Whitetail might be able to fire up the snowguns near dawn, but I still think the humidity will be too high.
I don't see substantially different forecasts for Roundtop or Liberty on weather.com in terms of when the temperature actually drops below freezing.
When the temperature is dropping, Roundtop, Liberty, and Whitetail usually dispatch their snowmaking teams and have them standing by, ready to fire up the snowguns as soon as the weather stations on the mountain show the conditions are right. You can *often* (although not always) tell their intent by checking the webcams after 11 p.m. If the lights are still on, the snowmakers are probably not getting the night off. But there's plenty of times when the temperature never quite drops low enough all night long.
In any event, assuming I am looking at the actual data and it matches what really happens (and I'm not just hallucinating), if you're trying to pick a resort to visit tomorrow based on expected overnight snowmaking, I don't think you're going to find much manmade at any of the three by the time the lifts start running. But wow, conditions should be getting great as the day and days go on, thanks to the arriving cold front.
I also don't think anyone can accuse Whitetail of skimping on snowmaking. As I said, they have been running the guns at full-blast (and considerable expense) almost every second this season that the laws of physics have allowed them to.