BISMARCK, ND, June 24, (AP): Two tornadoes that killed six people in North Dakota and New York each had wind speeds topping 100 mph and caused brief but widespread damage as they tore through largely rural areas, officials said. Three people, all in their 70s and 80s, died in rural Enderlin, North Dakota, during a storm that struck late Friday and early Saturday, the Cass County Sheriff's Office said.

Three others, including twin 6-year-old sisters, died Sunday in a storm that struck the hamlet of Clark Mills in central New York, the Oneida County Sheriff's Office said. The National Weather Service gave preliminary ratings of EF-2 to EF-3 or potentially higher for three tornadoes that struck eastern North Dakota - meaning wind speeds of 111 to 135 mph (179 to 217 kph) and 136 to 165 mph (219 to 266 kph), respectively, with varying severity of damage. EF-3 and stronger ranges are not usual for the Northern Plains, National Weather Service Meteorologist Jacob Spender said.

"As we go higher on the scale, it’s not as common but they can still happen,” he said. The tornadoes uprooted numerous trees, tossed train cars and damaged houses, Spender said. The night included supercells in southeastern North Dakota and a derecho - a powerful windstorm - that tore across the state to the east.

The wind lashed little Page, North Dakota, population 250, for over an hour, ravaging trees, roofs and structures, Mayor Jim Heidorn said. Half the town's trees are gone, he said. Cleanup might stretch throughout the summer. Kylie Weber was hunkering down with her family and some friends at her family's rural home near Oriska when the storm sucked her bedroom window out of the wall, blew the room's door off its hinges and ripped off part of the roof, she said.

Their farm also lost a grain bin, among other damage. Thousands of people were still without power Monday. Having numerous ways to be alerted to severe weather is crucial, such as by smartphone and radio, Spender said. Many people vacation at lakes in remote areas in summer, and nighttime storms can be especially dangerous because people can't see what's coming, he said.