Cool little track. I was riding a track day at willow springs, one of my first track days.
The rain came and they announced the first session was active. I went out and was the only one on the track. I remember all the looks of disbelief and the he's gonna crash laughs.
I lapped for a good 30 minutes in pouring rain...then it let up! I started to wick it up a bit and I guess they called open session because the whole pit entered the track. We had a nice Congo line going which dried one small line around the whole track.
Nobody crashed and I ended up riding for at least 60 minutes before my arms gave out.