India, Dec. 31 -- The National Weather Service has warned that there could be rain at the Rose Parade in Southern California for the first time in 20 years. The iconic New Year's Day event attracts thousands of spectators. Millions of others watch it on TV.

Forecasters have also shared an update on the weather expected during the Times Square Ball Drop in New York City, which has become a global moment of shared celebration on New Year's Eve. Millions pack into Midtown Manhattan to witness the spectacle and ring in the new year together, while millions of others gather around TVs, phones, and laptops to watch the glittering crystal ball slide down a pole.

Several regions in California saw mudslides and other miseries caused by storms. T...