Cold Arctic outbreak forecast to spread across the United States after Sunday, with temperature anomaly more than 40 °F below average
After a significant cold outbreak and record early snow in September, winter weather is spread across the Northern Plains this week. And to top this, another very powerful Arctic outbreak with extremely cold temperatures is forecast to spread across a large part of the Central Plains and Midwest over the next weekend through Tuesday next week.
Before the Arctic outbreak blasts from Canada, some winter and snowy weather with cold temperatures are forecast for the northern portions of the United States. Snow is expected to develop from Montana to Minnesota until Friday.
Through Wednesday into Wednesday night across Montana and Wyoming, and then further east through Thursday night over the Dakotas and northern Minnesota.
The northern Plains are on the edge of the large cold pool sitting over Canada, but the overall pattern does not move a lot, so the cold air mass is trapped over Montana, Dakotas, and towards the Great Lakes.