I did a dumb thing that gave me a good lesson. As I was sliding my Hunter 26 off the trailer, I heard thunder, saw lightning really close, and the wind started to pick up from 8 knots. As my wife went to park the truck and I waited for docking assistance, I put up the fenders, readied the dock lines, and lowered the rudder. Then the blast hit me: 30 knots and torrential rain. I should have seen it coming. My mistake: us having an itinerary and the weather having a different itinerary. Classic.I hadn't yet opened the ballast nor lowered the swing keel and now had my hands full. I didn't turn well to starboard because of my rudder-tiller connection and a very stiff transmission cable for which I had ordered a replacement but had not yet received. In the 30 knots of wind, the boat would not turn through the wind to starboard at all. The result was that I made 3 port-side circles before my wife got back down to the courtesy dock and three times the wind blew the rail into the water when I was broadside to the wind and the back of my shirt got wet. Thought I was going over, with the companionway wide open...I've seen posts here before postulating that maybe turtling or sinking could happen without the water ballast tank full. I'm here to tell you that it could: might take more than 30 knots, but not much more. This boat really catches the wind.Just call me Captain Calamity...