me ,my brother ,and our girlfriends were having a fire in the summer in town ,it was a clear summer night full moon ,very bright out . then i noticed a line of clouds moving in from the north .i said oh man our evening will be cut short.it took ten min for the line of clouds to get to our location which surprised me because there was no wind that night.as it passed over at tree top level,maybe 100 feet over our heads ,we could all see smoke coming out of holes an being sucked into differant holes simultanuosly.all you could hear was a light whooshing noise.in a few minutes it had passed over us and was moving south,a few minutes later it was gone and it was back to a clear sky like before .we were all left in awe at what had just happened because the size of it was massive as far as you could see in both directions when it was over us.it took only maybe half an hour for it to come into sight and then leave our sight.it was not a cloud .did not see any lights .or the shape of the craft because of the stealth smoke screen moving across it.