Authorities confirmed that seven children and two adults were injured after lightning struck down a tree at the Dolphin Swim Club in Feasterville, Pennsylvania
The stormy pattern will continue across much of the Northeast into Wednesday, bringing high humidity and thunderstorms to much of the region.
Above-average temperatures were generally limited to the Desert Southwest last week, but a shift in the jet stream pattern will bring expanding heat across much of the Intermountain West this week.
Without much of a change in the pattern, thunderstorms will be around in Pennsylvania for the next several days.
Following news that monsoon rain has claimed more than 300 lives across India, Myanmar and Pakistan so far this month, the risk of flooding will expand to India's National Capital Region (NCR).
A torrential downpour inundated Istanbul, Turkey, and other northwestern cities of the country on Saturday, resulting in the death of at least one person.
The recent finding was "purely accidental," one scientist said. Meanwhile, a similar phenomenon was observed in Arctic snow leading another scientist to describe the discovery as "a real shock."