Provincial police said emergency responders were dispatched to Caliper Lake Provincial Park in the Sioux Narrows-Nestor Falls area shortly after midnight Monday after receiving reports of a major weather event. The Township of Sioux Narrows-Nestor Falls described it as a “supercell storm” with strong winds. The township’s Facebook post said firefighters and police continue to respond to emergency calls. According to Environment Canada, most summer severe weather events are caused by a supercell, a special type of storm where multiple strong updrafts continue to feed the storm, which can allow it to maintain intensity for hours. Hydro One’s online storm page shows outages affecting about 350 customers in an area along Highway 71 north of Highway 11 that includes Caliper Lake. At Caliper Lake Park, police said several trees were downed and fell on campers and vehicles while also blocking the road. No injuries have been reported, police added. The Ontario Parks website shows Caliper Lake Park will be closed until at least Friday. Police said travel in the Nestor Falls area is advised to be limited due to downed trees and power lines.