A rain delay during the 7th inning of a Frontier League game between the Joliet Slammers and the Southern Illinois Miners almost turns tragic, as hurricane-force winds begin tearing through the ballpark, ripping the tarp off the field and swallowing a number of the workers who are trying to secure it with sandbags. Luckily, no one is hurt, but the game is cancelled.

On June 30, 2012 A rain delay during the 7th inning of a Frontier League game between the Joliet Slammers and the Southern Illinois Miners almost turns tragic, as hurricane-force winds begin tearing through the ballpark, ripping the tarp off the field and swallowing a number of the workers who are trying to secure it with sandbags. Luckily, no one is hurt, but the game is cancelled.

Source
Baseball Reference June 30