Tuesday Evening: We have been saying for a week now that we could see our 1st freeze this week, especially in outlying areas.
Sandy's difference in pressure with our cold Canadian high has increased the northwesterly winds, and also helped to pull more cold air down from the north.
However, we need those winds to calm down to see that freeze.
Tonight, they may relax a little, hence the Freeze Warning. However, I think the winds will be lower tomorrow night.
Yes, outlying areas could see a freeze tonight, but it might be even more likely Wednesday night into Thursday morning.