Chicago weather forecast hour by hour for September 21

• Chicago area braces as coldest temperatures since 2019 polar vortex near

  

• Chicago temperatures plummet below zero, Cold Weather Advisory in effect

  

• Some sun Friday in Philly before temps drop and snow arrives this weekend

  

• Ice storm warning issued for north Georgia as significant icing threatens power outages and dangerous travel

  

• Rainy Friday in North Texas before ice, sleet and extreme cold settle in

  

• MARTA to reduce service ahead of weekend ice storm in metro Atlanta

  

• Will the winter storm in Pittsburgh bring power outages?

  

• Timeline shows when snow is forecast to start and end in Pittsburgh area