(This was on my old 1986 FZ 750 BTW).
I was living in Sacramento (Rancho Cordova area) and had to go to the shop for work. It was raining out, with some thunderstorm going on, but no big deal as I had a really good Taifun brand rainsuit (which I tossed out a few weeks before I bought Ninja Boy, but that's another story.)
I was just a few blocks from work, at a stoplight, when all of a sudden I heard a loud roaring sound....then the rain came down so hard I literally could not see beyond the windscreen. The wind picked up, a lot, and I actually felt the bike beginning to lift off the ground.
About 20 seconds later, the noise stopped, the rain let up to a light shower, and the cagers on either side of me were looking at me in shock, amazed that I was still there.
I got to the shop to see my boss on the phone, both his face and knuckles were white as a sheet. He'd had the TV on and saw a tornado warning for our area and was calling to tell me to stay home.
News later confirmed that a tornado funnel had passed directly over the area I was stopped at, and had touched down briefly a mile or so away.
Almost as exciting: Hitting a patch of black ice in the mountains up there returning from work at Clear Lake.
Only other time I was more scared on a bike was taking the 101 Fwy through Downtown L.A. area.
I have done double jumps on my YZ that didn't even come close to the terror of that stupid freeway.