Officials canceled the Chicago Air and Water Show Sunday because of poor visibility.
The Chicago Sun-Times reports the show was delayed three hours before getting underway at 1:30 p.m. Low clouds along Lake Michigan did not lift, however.
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Officials suspended the show at 2 p.m. and canceled it at 3 p.m. It also ran Saturday.
The National Weather Service at Chicago says "rare low clouds" affected the show. Officials say such clouds -- those below 1,000 feet -- have been seen on fewer than 3 percent of August days since 1973.
It's not the first time weather conditions have affected the event. The 2011 show was canceled because of poor weather.