The National Weather Service forecasts a 100% chance of rain for Pasadena, California, on New Year's Day, coinciding with the Rose Parade, an event that hasn't seen rain in 20 years and attracts thousands of spectators and millions of TV viewers. The parade precedes the Rose Bowl College Football Playoff game. Recent storms have caused flooding and mudslides, adding to concerns. Arctic air is predicted for the eastern US, with temperatures in the low 30s Fahrenheit (around 0°C) in cities like New York and Nashville. Light rain is possible in Las Vegas during New Year's Eve celebrations.