1.   Lightning flashed across the sky.

2.   Lightning flashed in the sky, and there was a loud crash of thunder.

3.   Lightning flashed overhead.

4.   More lightning flashed overhead, followed by loud thunder.

5.   Lightning flashed among the distant dark clouds.

6.   Lightning flashed again, brilliant as a fluorescent light.

7.   A full moon rose behind us in a clear sky while lightning flashed over the high peaks in the distance ahead.

8.   Lightning flashed near a speaker system not far from the pope.

9.   Lightning flashed.