However, all the snow (2 to 5 feet) depending upon the altitude will likely melt at I-5 level on Thursday and Friday:

From Yreka to Dunsmuir and Redding at least. However, at night I would be careful of Black ice everywhere because you usually can't see it and if you don't see it you could easily be dead soon.

So, be careful even Thursday night and Friday night because of this. After Thursday and Friday of rain melting snow then it snows then it rains on a daily basis sort of one neutralizing the other so snow likely cannot accumulate most places under 4000 feet in elevation as a result throughout Siskiyou County where Mt. Shasta (the mountain is). Under these conditions like I said really be careful of unseen Slush and Black ice everywhere both of which are extremely dangerous for newbie drivers in ice and snow.

If you see ANY Black ice one way to stay alive is to severely reduce your speeds in your vehicle or just get off the road so you can stay alive through these conditions.