Very helpful, thank you. The ridge of their coop is vented - there is about a two inch gap between the peak of the roof and the front/rear coop walls, so hopefully that's good enough but I will definitely keep an eye on it, probably do a test, to make sure there is enough ventilation.
When we had that misery mist last weekend long they did get pretty wet one of the days, actually Sunday right before the front blew through. I was concerned so we took them in the garage, gave their feet and bottoms a wash, and dried them off with a light/low hair dryer. Threw some fresh straw on their "inner" enclosed run to make sure it was dry enough before the front came through. They seemed happy (and dry)
Thanks again!