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

The warning is in effect until 6 p.m. Lightning strikes the United States about 25 million times a year. Most of the strikes occur in the summer, killing 20 people each year, according to the NWS. Chance of lightning increases as a thunderstorm approaches and peaks when the storm is overhead. It diminishes as the storm moves away.