Lightning struck a school baseball field in Delaware County, injuring a worker.
The victim was tending to the field at the Glen Mills School around 2 p.m. when thunderstorms that were producing a lot of lightning rolled through.
The man told paramedics that he felt the effects of the lightning strike. He was briefly knocked unconscious, according to Edwin Truitt, the director of school's emergency services department.
The man was able to walk to the ambulance on his own and taken to Crozer-Chester Medical center for evaluation.
The boys-only, residential school for juvenile delinquents, is located at 185 Glen Mills Road in Glen Mills, Delaware County, Pennsylvania.
"There is a lot of lightning in the thunderstorms building now," said NBC10 Chief Meteorologist Glenn "Hurricane" Schwartz. From 2 to 2:30 p.m. there were over 1,000 lightning strikes generated from the storm, which was moving from Delaware County into Philadelphia. A Severe Thunderstorm Watch was issued for the entire viewing area. A Severe Thunderstorm Warning was also issued for Delaware County, Philadelphia and northeastern New Castle County. Both the watch and the warning were cancelled for the entire area shortly after 8:30. Another severe thunderstorm warning was then issued for Burlington and Ocean Counties until 10 p.m.
During the storm, a tree fell on top of power lines while a car hit a pole around 2:15 p.m. in the Glen Mills area. Around 3,000 customers lost power. 
Lightning also struck a home on the 300 block of Lindsay Street in Ridley Park, NJ late Monday afternoon. While the home was damaged, no one was injured.
A tree on the border between West Chester and Coatesville, Pa. near the Broad Run Golf Course was also struck.
Summer is the peak season for lightning strikes, according to the National Weather Service. And coincidentally, this is the organization's Lightning Safety Week.
- LIVE INTERACTIVE RADAR: Track Storms Moving Through Your Neighborhood
- NBC10 First Alert Weather Apps: On Your Smartphone and Tablet
"It's hot and humid in the summertime and so you tend to get more thunderstorms that form, and consequently more lightning," said NBC10 Meteorologist Sheena Parveen.
The government tracks the number of lightning deaths each year. So far, for 2013, seven people have been struck and killed by lighting: Two in Florida, two in Illinois, one person in Texas, another in Louisiana and the seventh in Missouri. The victims are four women and three men. All of the men were out in fishing boats on the water when they were struck. In the other four cases, one woman was in the front yard under trees, another in a park, another on the beach and the fourth woman was standing outside a restaurant in Texas when she was killed by lightning.
Last year, lightning killed 28 people across the country. One of the victims was a NASCAR fan who was struck by lighting outside the Pocono Raceway. Brian Zimmerman, 41, was killed when the first of at least two lightning bolts hit inside the Grandstand Parking lot. Eight other people were injured.
Check back for updates on this developing story.
Photo Credit: Adrea Miller