Apple-Crop: degree days and apple bloom prediction

[William Sharp]

I am In the Shenandoah Valley of Virginia and we are about 1/2" green tip (or a 
little further) on Red Delicious.  It is supposed to be quite warm the next 
couple of days and I am trying to predict when apple bloom may be i..e. will it 
be within the next week.  Does anyone have info on using DD to predict bloom?
We are not yet at bloom on peaches, but I expect it to start tommorrow.
 
Bill Sharp