We have had a little bit of snow over the last 24 hours, so I decided to install some mid span supports under the ridge purlin in the high tunnel.  The first picture is without the 2x4 14' installed.

I didn't go up and measure, but it looked like the snow had drifted to about 18" deep up near the ridge.

This is what our winter test crops look like after a week of temperatures down in the negatives.

Most of the big drift has slid off the roof.