Of course, this is just counting up what has happened in similar situations in the past, and is not really predictive, but still interesting:
I heard than on a broadcast, but the following website gives better breakdowns:
http://www.whowins.com/tables/up10.html
In our particular situation (conference finals, game one win, at home) Series probability of win is 84% (64 wins, 12 losses). (I remember losing to Lakers with game one win).
Visitor who wins game 1 has a 70% to win the series ( 24-10). (I remember when we overcame those odds before).
Teams leading 2-0 in the semis with home court are 47-3 (again, we lost after winning 2 to the Lakers, but that was in quarters; there, the odds were even better that we should have won the series, but I digress).
So, if we win tomorrow, it become pretty unlikely we lose the series, barring injury.
Also interesting, the above website gives the odds of winning game 2 as only 65% (50-26).
Very strange that many game 2's are lost, yet obviously those series still often yield a win for the higher seed. Thus, game 2, as a predictor of series wins, is less important than a game 1 win.