We get that type of weather out here. On Monday I was able to see the wall of change in front of me when I was driving back from my parents which is north of Red Deer. The temperature was -19C on one side of the wall and once I passed through it the mirrors on the car fogged up and the interior of the car suddenly became warm and humid. I thought the heater core had blown up. I looked at the temperature reading, it had gone up to -2 in an instant, very interesting to see.