Temperatures will begin to dip Saturday night, and by Sunday morning, the actual temperature is expected to be below zero - we could face wind chills of -20. Some snow could also begin to fall Friday during the later evening commute.
It'll be a big shock to the system after a few days of these nice mild temperatures.
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"It's Chicago, it's Illinois, it's not a big deal you just have to bundle up, if you're in, stay in, if you are out, get in," said Winsome Williams, a resident.
Friday afternoon CTA officials assured passengers that cold conditions will not slow their trains down.
"We traditionally prepare days in advance and hours beforehand, we lay down the de-icing, ensuring we won't have problems with the third rail, any icing," said Tom Dietrich, CTA.
They said they are ready for what's to come.
"Part of this set-up allows us to lay a coat of de-icing paste on the third rail to prevent future build-up. It gives us 45 minutes to an hour of ice-free build up time," Dietrich said.