'A long period of extreme wind chill': Environment Canada warns of deep freeze in Sask.

Extreme cold conditions are expected over the next week as an Arctic air mass makes it way into the prairies. (CTV News file photo). Extreme cold conditions are expected over the next week as an Arctic air mass makes it way into the prairies. (CTV News file photo).

CTVNews.ca Top Stories

At least 21 dead after tornadoes rake U.S. Midwest, South

Storms that dropped possibly dozens of tornadoes killed at least 21 people in small towns and big cities across the South and Midwest, tearing a path through the Arkansas capital, collapsing the roof of a packed concert venue in Illinois, and stunning people throughout the region Saturday with the damage's scope.