On one of the hottest days of the year, hundreds of people found a way to cool off in Boulder. An annual tradition returned Friday morning as hundreds jumped into the chilly water of Boulder Creek to travel to work via an inner tube. Boulder's annual Tube to Work Day is called the world's greatest traffic jam and a bonding opportunity each summer. Tubers checked in at Eben G. Fine Park before tubing downstream to Boulder Central Park and beyond. Boulder and Colorado's Front Range, including the Denver metro area, is forecasted to reach 100 degrees on Friday, Saturday and Sunday. Monday could also see a high in the upper 90s. More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.