It is supposed to rain from tonight at midnight until ~ 8am tom. morning. We were planning to go to Whitetail tom. (2/17) to avoid the weekend crowds. And, for the life of me - I cannot remember what rain does to the conditions. Will they be OK, or terrible, or in between?
Any help is much appreciated!

Nobody likes to ski in an active rainstorm. As long as it's supposed to clear up by the time of your visit and temps are well above freezing, a bunch of recent rain shouldn't ruin skiing fun. The surface will be like spring skiing, a little slushy, but better than ice. And you'll beat weekend crowds. What can be interesting is when a rainy period is followed by a deep below-freezing temperature drop like what might happen on Saturday morning. This can create unpleasant hard-pack or ice. But even the radical temp drop scenario isn't too disastrous in this age of great snowmaking, because the ski areas often can make lots of new snow to quickly cover the frozen surface underneath.

I was just there yesterday, they got a lot of snow on the trails. Folks there seemed to uniformally say that they were intent on making snow this weekend during the cold snap. If you could push it till monday, that might be better -- on the hand spring-like skiing is fun too. We had a heck of time yesterday, see about some wet-snow wax if you can find any.
something you can carry in your packet and apply a couple times during the day.