The Chicago Air and Water Show may not happen today because of rare weather conditions:
[T]he Chicago National Weather Service said "rare low clouds" are impacting the Air and Water show. Low clouds have a ceiling height of 1,000 feet, the weather service said. Only 2 to 3 percent of August days have had low clouds since 1973, the weather service said.
Now, skipping the foggy understanding of weather terms and government agencies the ABC reporter showed in that paragraph, it doesn't look good for the show. Right now conditions the lakefront has low instrument meteorological conditions due to a 125 m ceiling (somewhere around the 60th floor of most downtown buildings) and 6 km visibility. The latest forecast calls for more clouds.
We've had a cool, wet summer, following a record-cold winter, so Lake Michigan is just a huge fog maker lately. Yesterday was warm and sunny, but in the past 12 hours a low pressure system has passed directly overhead bringing northeast winds and draping a cold front across the region. It's 6°C warmer in Aurora and Kankakee than it is in Waukegan or Racine, for example.
So, thousands of people are disappointed today. Still, it's quiet and cool in Lincoln Park right now. That's not a horrible outcome.