Condensation in a Supermid

“I wonder if the problem was caused by the snow accumulating around the base of the tarp and closing off that venting option?”

Bingo.

Usually there’s less condensation when it’s windy

Was your tent exposed to clear night sky?  That can cool off the tent fabric more so there’s more condensation

I think Dave nailed it: the snow choked off the fresh air supply.

It was a super windy night with lots of clouds and snow. Mid was erected over what appeared to be dry vegetation (knee didn’t get wet when I knelt on it); snow came later.

It was a last second decision to use the mid over a flat tarp (trying to save capacity for beer since it was an easy walk in). Boy were we glad to be protected from the vicious wind/blowing snow.

We did button the Supermid tight to the ground (for wind protection) and used large rocks on top of the corner stakes. It hardly even fluttered in the wind.

.edited non helpful comment.

There’s a huge difference between camping in snow/20* and camping on ground/30-40* with a given tent, which is at least partially why you didn’t have problems with the Duomid.