Cold weather outbreak across the Upper Midwest and Great Lakes
![](https://cimss.ssec.wisc.edu/satellite-blog/wp-content/uploads/sites/5/2019/01/20190130120033_namer-1.jpg)
A highly-amplified upper air and jet stream pattern allowed a lobe of the polar vortex to migrate southward across southern Canada and the north-central US — leading to an outbreak of arctic air throughout the Upper Midwest and Great Lakes during the 29 January – 30 January 2019 period. The path and expansion of... Read More