Natural History Wanderings

Yosemite National Park has a post on how to be safe around and avoid being struck by lightning

Thunderstorms bring lightning, a powerful force that can result in death. In July 1985, lightning at Half Dome killed two people and injured three others (two of them, critically).

Though most common June through September, thunderstorms can happen any time of the year. During July through September, the North American monsoonal weather pattern can cause moisture from the Gulf of California to flow into the Sierra Nevada, resulting in thunderstorms.

Ultimately, there is no safe shelter outside. The only safe place is in a substantial building or hard topped vehicle.

Read more at Lightning Safety – Yosemite National Park (U.S. National Park Service)