1.   High-voltage spikes are usually caused by lightning.

2.   In the dry season of midsummer, most of the fires there were probably caused by lightning.

3.   Lightning had caused his heart to fibrillate.

4.   Lightning causes more casualties annually in the United States than any other storm-related phenomenon except floods.

5.   Near Omaha, Neb., on Saturday night, lightning caused fast falling snowflakes to sparkle.

6.   Then one day, while he was on the computer, his hard disk was fried by static electricity, apparently caused by lightning.

7.   To be sure, the proportion of residential fires caused by lightning is relatively low.

8.   Those years of fuel accumulation have made it more likely that even a small fire caused by lightning will spread.

9.   Two failures in Oakland, Calif., were caused by equipment failure, the experts said, and one in Miami was caused by lightning.

10.   Firefighters were battling three other large fires in northwestern Colorado, at least two of them caused by lightning.