The messages between an Amazon.com Inc. delivery driver and her boss began about 80 minutes before a tornado struck one of the company’s warehouses in Edwardsville, Illinois, on Dec. 10, killing six workers. The dramatic exchange cast in sharp relief the chaos that can ensue when disaster hits and disagreements erupt about when it’s time to heed warnings and cease working.

“Radio’s been going off,” the driver wrote in a text obtained by Bloomberg News.