I was in Yosemite a couple years back.
They had a historic hail and electrical storm that weekend and a woman was actually hit by lightning on half dome.
Anyway. I was a few miles east from there up past the Little Yosemite Valley down past Clouds Rest.
The sky was insane. It was impossible to predict what was going to happen. I kept hearing lightning and seeing thunder but it always seemed a few miles away and it wasn't raining.
Eventually it caught up to me and started to rain, a bit. But the sky looked reasonable.
I just ducked under a very large/massive redwood tree.
This was a short shower… maybe 30 minutes. Didn't even put away the Kindle. I just chilled and read my book. The tree completely protected me from the rain.
So now with the false assurance, and the rain stopping, and the clouds clearing up, I decided to keep hiking.
I'm hiking for about 45 minutes when I come upon a clearing of granite. I wasn't TOO concerned about thunder at this point. If I was I wouldn't even have taken any risks.
I was at about 8k feet… there was still tree cover so with that I felt safe from the thunder at least. And I didn't get struck or anything so that was good.
However, the storm started getting worse and it did start to rain a bit.
The clouds looked the same as before so I just ducked under a fallen redwood. It was horizontal and made a GREAT barrier from the rain.
Except it kept getting worse. And worse.
Then hail…. then more hail. Then hail the size of a dime. Now it's ALL hail… now the hail is the size of a nickel….
and it's coming down HARD!
What I didn't expect was that the canyon walls were all granite so ALL of the water, hail, etc was being directed to my spot.
Pretty soon a wall of water and hail is coming my way and I have to bail…
I had to pack up all my stuff in like 2 minutes as it's getting wet and then run up the canyon while I"m getting pelted by hail and rain HARD… I'm soaking wet…
I manage to setup the tent and keep MOST of the water off me.
I was somewhat cold but don't think I was near hypothermia. My biggest concern was setting up my tent without getting anything wet.
The biggest issue was the hail as it REALLY hurt and one errant piece hit me in the corner of my eye and I had a little bruise there the next morning.
On the upside, the tree across the canyon caught fire from lightning and was burning the whole night.
It was like a second sunset… I'll never forget it. Unfortunately I couldn't get a picture or get to it as it was across the river.