Although these recent storms have provided a short-term bump for Lake Powell, they have also caused a lot of misery in southwestern Colorado, northern New Mexico, and on the Navajo reservation. At this point, those folks would be happy if it would just stop raining.
Also recall that last year we had a similar pattern of extratropical moisture causing serious flooding during the fall in these same areas, but the subsequent winter turned out to be a fizzer, and by the following summer the whole region was in extreme drought. So best to temper expectations until we see what winter really brings. Rain can produce a nice transient improvement, but the only real solution to drought in the Colorado River Basin is snowpack. As a cautionary note, Colorado has had its warmest September and October (to date) on record, and it was the warm temperatures, rather than the absence of precipitation, that really hurt us last winter and spring, because the snow all melted in March. It needs to be cold as well as wet to really get us out of the jam we are currently in.