Ice. Cold. Snow. A chilling, and sometimes deadly combination. Hydro worker Michael McLean has been working in extreme cold weather for decades, but a rare system called an arctic blast rolls in so fast that it traps him at the top of a hydro pole; pilot Gerard Skocdopole is trapped in an intense blizzard in the Antarctic with crew members and limited fuel; after saving trapped drivers, snow plow operator Joe Klein is stuck overnight on a mountain during a bone-chilling blizzard.  Scientists explain cold weather systems, and what causes severe and rapid drops in temperature.