Brutal cold arrives in Minnesota, wind chills of 20 to 35 below zero

(FOX 9) - Have you been outside today? It is about to be really, really cold. 

Temperatures have been sliding through the night with wind chills in the metro dipping below zero around 6:00 a.m. and could be hitting around -20 this afternoon.  

Western Minnesota is already dealing with wind chills of -20 leading to many schools closing or delaying their start times.

A wind chill advisory is in effect through Friday morning because frostnite could occur in under 15 minutes.

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