For the first time in two decades, rain might disrupt the Rose Parade in Southern California. This iconic New Year’s Day celebration draws thousands of onlookers and captivates millions more through television broadcasts.

Recently, storms have hit the region hard, bringing floods and mudslides during Christmas week. Now, the National Weather Service forecasts a 90% chance of rain on Thursday in Pasadena.

“We try not to mention that word here,” quipped Candy Carlson, a representative for the Pasadena Tournament of Roses. This organization is responsible for the 137th Rose Parade, which takes place before the college football playoff, the Rose Bowl.

Rain has only graced the parade ten times in its storied past, with the last occurrence in 2006, Carlson noted.

Despite the forecast, the wet weather isn’t expected to deter the participation of floats, marching bands, and performers. Carlson assured that float riders will be equipped with rain gear if needed, and tow trucks will be ready to assist with any mechanical issues.

Spectators will need to prepare, too. Umbrellas are not allowed in parade seating areas that require tickets, though the ban doesn’t cover people who simply line up along the nearly 6-mile (9.6 kilometer) route. Curbside camping — no tents — begins at noon Wednesday. Rain also is predicted that day.

“Last year’s parade theme was ‘Best Day Ever!’ and six days later it was the worst,” said Lisa Derderian, spokesperson for the city of Pasadena, referring to the devastating Eaton wildfire in Los Angeles County. “We want to start the new year on a high note. Hopefully Mother Nature cooperates with the weather.”

In New York City, meanwhile, forecasters are predicting temperatures in the low 30s, which is not unusual, when the ball drops in Times Square on New Year’s Eve. Light rain is possible that night in Las Vegas, where several casinos will be shooting fireworks from rooftops.