A little story...
This happend a few months ago, my sailing club was holding a open day in ~June. It is one of the towns bigger attractions as we bring in Kessock and Invergordon Lifeboat, Moray Inshore Rescue were there too. Probably just as well, round about 2 ish we heard a rumble of thunder, I walked out to survey the weather as we were launching a few sailing dinghys to sailing along side with the Yachts in the "Parade of the Sails". When you looked out all you could see was a thick cloud covering the Moray Firth, it was quite surreal, wish I had the camera on me. I called over radio to discuss about canceling the parade due to the rising wind and black cloud in the distance. But you know, my sailing club does what it does best, doesn't listen to a teenager like me
So we (hesitant) launched the boats, we had 2 wayfarer worlds going out. About 10 minutes in we started to get heavy rain that then turned into heavy hail, it reduced visibility so much, you couldn't see 2 foot infront of the boat. The winds went from 10knts to 56knts in 5mins. So we launched all 3 rescue boats (RNLI, MIRO and ourselves). 1 boat managed to get in but we lost contact with the 2nd boat. After 5mins of serching we found a upturned hull with 2 people on it. We grabbed the 2 sailors onto our boat and the RNLI folks righted the dinghy, they towed it back. We all went back into the harbour, luckily nobody was hurt on the sailing dinghys. The only unfortunate thing was that 5 gazebos had blown away from the stalls!
All ended well though, only 1 person went to hospital from an accident from a gazebo, luckily, nothing serious happened.
[our boat is the boat behind the RNLI folks on attached photo]