No they didn't, just looks that way—check the cloud 'horizon' line, where the big dark mass starts, you'll see it's the same.clouds moved a lot in the last two pictures
First time I tried to catch lightning, so I was messing around in Photo Mode. One of the interesting things is the weather keeps 'happening' in PM—lightning keeps flashing, rain keeps falling… compare the rain streaks above her in 3rd, not there in 4th.
So I snapped a bunch of shots trying to catch lightning, but there's a ~¼ second delay between pressing 'take pic' and it happening, so sadly no blazing forks yet. What you're seeing are 2 different flashes caught with different levels of success—4th pic just has a lot more lightning in it.
It seems to be only environmental elements which keep moving during PM, as it's same with rivers and sea, but NPCs, animals, trucks, choppers etc freeze.