I roosted 13 birds (4 toms) last Tuesday which was the evening before opening day here in Oklahoma. The wind was blowing about 30 mph that evening and the birds didn't fly up until the last minute before dark. The wind continued to blow all night and on opening morning the wind was still blowing 30-35 mph. The birds flew down from the roost at 6:20am which is what they had been doing for the last few weeks give or take 3-5 minutes. I hope that this helps.

PS: The largest tom in the group hit the ground for a second time at 6:24am