July 23, 2013 11:26 am How Are Waves Formed? Meteorologist Andy Avalos breaks down how massive waves are formed. Local 2:18 Latest forecast from the NBC 5 Storm Team 2:18 Chicago Forecast: Evening storms to end a summer-like day 1:50 CHICAGO FORECAST: Dry conditions overnight ahead of possible storms Saturday afternoon 3:15 Friday morning weather 1:44 CHICAGO FORECAST: Storms impact region ahead of weekend cooldown