July 11, 2014 9:54 am Pete Sack Explains the July “Polar Vortex” The term “polar votex” returned to our collective vocabularies this week. What does it mean in July? NBC 5 Storm Team meteorologist Pete Sack explains. Local 1:44 CHICAGO FORECAST: Storms impact region ahead of weekend cooldown 2:25 Thursday afternoon forecast 3:05 Thursday morning weather 2:16 Wednesday afternoon forecast 3:03 Wednesday morning weather