• Frigid air in the Upper Midwest and Great Plains is headed South, where it’s encountering moisture along a frontal boundary, and leading to this treacherous stretch of icy precipitation.
  • NOAA’s Weather Prediction Center forecasted several rounds of wintry precipitation, including light freezing rain and sleet from Monday to Wednesday. Ice accumulations may be greater than a quarter of an inch, the prediction center said.
  • The ice “will lead to tree damage and power outages across the hardest-hit regions,” it added.
  • The dangerous weather had already led to hundreds of flight delays and cancelations by Monday afternoon.
  • Temperatures were in the single digits Monday afternoon in South Dakota cities Sioux Falls, Rapid City and Aberdeen.
  • Minneapolis and St. Paul, Minnesota, had single-digit temperatures, too.
  • By Monday afternoon, a few school districts had announced they would be closed or delayed Tuesday.