As storm clouds hovered over Chicago on Saturday, officials canceled outdoor music festival Lollapalooza until further notice and herded more than 100,000 people from Grant Park toward three underground shelters along Michigan Avenue.
“ATTENTION: Serious weather is about to hit Grant Park,” @Lollapalooza said in a Tweet . “ALL festival goers must evacuate IMMEDIATELY. Head to our 3 evacuation locations NOW.”
Minutes later, it began to pour.
Violent storms in the Illinois forecast were expected to bring hail, winds stronger than 70 mph and rains heavy enough to prompt flash flood warnings, the National Weather Service said. Temperatures remained in the mid-90s, with high humidity, ominous clouds and heavy rain in northern Illinois. Southwest of Chicago, the service reported wind gusts of up to 60 mph.
Similarly powerful winds caused the rigging on a stage to collapse at the Indiana State Fair last summer, killing seven people.
[UPDATED AT 4 p.m.: The gates to Grant Park have reopened, and shows will resume at 6:30 p.m. CDT. A revised performance schedule for Saturday night is available here.]