Each year, lightning strikes the United States approximately 25 million times, mostly during the summer. It claims the lives of about 20 people annually, according to the weather service. The threat of lightning becomes more pronounced as thunderstorms draw nearer, peaking when the storm is directly overhead and gradually waning as it moves away.

Severe storms delayed flights at NYC airports, with LaGuardia under a ground stop and hail and wind warnings for upstate counties.