Lightning in the area? No one on the ground will want to go near the plane until the risk of lightning subsides. I've been waiting at the gate but no one will connect the ground cable, and hence no jetway to deplane, until lightning leaves the area. If we can build planes to fly half way around the world, you would think we could figure out how to safely ground the airframe in a storm! Maybe tires should be made of metal instead of rubber!