Ice Curve

What do you suppose is going on here?  You can look for a bit and try to figure it out--then look below for the answer :)

The APT Finals reached the semifinals today. We were sad to see Roger Federer succumb to Sasha Zverev (the youngster from Germany--he's just 21 and very promising).  Novak Djokovic beat Kevin Anderson, as everyone expected.

THE BLIP EXPLAINED:
It's captured through the windshield of my car--water melting from the recent snow still on top had frozen as it dribbled down the glass.  The temperature today has been in the low 40s F (12 C), so it's a bit surprising that the water froze.  There were other ice dribbles, but this one yielded the best image.