Just got back from checking on the huddled masses. They are all under MHP. This is the first night they've used it since Wednesday night. It has been lifted up onto a little nesting box ledge that is about 4" off floor of loft, with the other end blocked by a brick so they can't knock it down. This provides them with more room so they can all fit. Evidently, the all or none behavior continues, even during a storm! If they all can't fit under MHP, they'll pig pile into a corner if they are panicked. I took out a huddle box late this afternoon but it was a new and forboding object. Hopefully, they will explore that in the morning.