Keen Apathetic

this is my first post on CC. Feel free to tear it apart. My friends and I were planning on doing a run up a Hood South Side this weekend. However, it looks like avi conditions are pretty bad. Does anyone know how bad the avi exposure is on the SS of Hood? i'v never been up during the winter. Or does anyone have any other suggestions as far as another route in the cascades are concerned. Avi info in the Three Sisters Wilderness? any help is appreciated.