It's from "Major League Storms" over at Facebook.
A polar vortex will hit North Dakota and then east to Chicago next week. Forecast for next Tuesday / Wednesday on the graphics above. I believe these are WIND CHILL temperatures, not actual air (ambient) temperatures.
The low for selected cities/areas (all temps in Fahrenheit; -40 degrees is the same in both Fahrenheit and Celsius, so in some cases it won't matter). Again, WIND CHILL temperatures, I believe:
- Williston: -44 degrees
- Tioga: -56 degrees
- Devils Lake: -70 degrees (again, this is WIND CHILL, I believe)
- Jamestown: - 69 degrees
- Fargo/Grand Forks: slightly warmer than Jamestown, at -66 to-67 degrees
- Sioux Falls: -51 degrees
- Rapid City: -17 degrees
- north-central: -56 degrees
Throughout the day today, the Weather Channel talked about the polar vortex that will hit the Midwest next week.