Friday's snowfall — 19 inches — broke the previous one-day snowfall record for October by about nine inches; it was set on Oct. 19, 1919, Carpenter said. Rapid City saw an extra 2.5 inches overnight. Friday also surpassed the record for the entire month, 15.1 inches, also set in 1919.
National Weather Service meteorologist Katie Pojorlie said Lead, S.D., in the northern Black Hills had received 43 ½ inches of snow by 7:30 p.m. Friday and more had fallen overnight.
That's not unheard of in the area, according to Donna Heaton, manager of the Terry Peak Lodge.
"Last year in April, we got over 50 inches after the ski area closed. It would be nice to help the local economy if all the snow would fall when the ski area and the snowmobile trails were open," she told AP radio.
And in southwest North Dakota, about 10 inches of snow fell Friday, the National Weather Service said.
Interstate 90 was still closed in the western part of South Dakota on Saturday, and officials advised against travel elsewhere as white-out conditions kept snowplows from making much progress on roads until at least late in the day.
"... There's no place to go even if you do get your of your driveway and onto your street," state Transportation Secretary Darin Bergquist said in a statement.
Crews with Black Hills Power weren't able to work overnight because of blowing snow, spokesman Mutch Usera said. The Black Hills' rough terrain and downed tree branches were also hampering restoration efforts, he said.
"Hopefully, the sun will shine a little bit and get a bit warmer. That's going to make it easier," Usera said.
When temperatures warm up into the 50s by Monday, the snow melt could cause flooding, White said, but officials are just focusing on rescue efforts for now.
Meanwhile, National Weather Service meteorologist Mike Fuhs said as many as nine tornadoes touched down in Iowa and Nebraska between 6 p.m. and 7:45 p.m. Friday. He called some of them "quite powerful," and noted it was unusual to see so many and with such power during the fall.