I hope you are ok, CoopChick!I had this happen yesterday. My mama & chicks were in the tractor only half was covered with a tarp. Unfortunately I was at the ER with severe stomach pain when the weather hit. When I got home at 8pm--mama was soaked from keeping the chicks covered. The rain must have come in sideways because the whole place was soaked. DH & I got chicks and mama back in the coop. I went back out with towels. Everyone seems fine today! I was so thankful I didn't put them out in the tractor today especially when I woke up to the torrential downpour today.
Ours, for once, were smart enough to get out of the rain yesterday. A lot of the time we have to go out and chase them in.