The coldest air of the season will roar into the Midwest and Ohio Valley next week as a lobe of the polar vortex comes south from the Arctic Ocean. The cold will eventually reach the Mid-Atlantic and Northeast.
Why it matters: The extreme cold outbreak may set daily temperature records, including records for the coldest high temperature on a particular date. It's also possible that an all-time cold record or two will be tied or broken. Temperatures hovering in the single digits or lower on Wednesday and Thursday in cities such as Minneapolis, Chicago, , Milwaukee and St. Louis, combined with the wind chill, will make it downright dangerous to be outside at times.