Vimeo user Angus Finlay uploaded this time-lapse video showing Grant Park during Lollapalooza’s epic Saturday afternoon storm.
CHICAGO, IL – AUGUST 04: Fans are evacuated from Grant park due to an approaching storm during 2012 Lollapalooza at Grant Park on August 4, 2012 in Chicago, Illinois. (Photo by Theo Wargo/Getty Images)
Concert-goers can be seen scurrying like ants as officials cleared out the park before the dark clouds moved in. The park was reopened several hours later, once it was deemed safe.