Good advice, and I thank you for posting it, but its directive to seek shelter won't do me much good as a hiker where there's no shelter to be had.

The advice I've heard for hikers is:
1) Stay the heck off of the heights in a thunderstorm. Plan your hike such that you start early enough to be off the heights before noon. Thunderstorm activity tends to be at its highest in the afternoon.
2) Don't take cover under an isolated tree. An isolated tree is a target for lightning. Take cover in a grove of trees, preferably a grove that has trees of a relatively uniform height.
3) Don't shelter under rocks or in shallow caves. Rocks and caves can intensify the lightning.
4) Spread your group out so that a lightning strike won't affect everyone simultaneously. If one person is hurt, the remaining members of the group can render aid. CPR skills would be very helpful if someone were to be struck by lightning but not killed outright.
5) Sit on top of your pack. Let no part of you touch the ground if you can avoid it.

That's the standard advice I've heard. Anyone else have tips?

HJ