A white Christmas in Los Angeles? Impossible! But, when 13-year old Allie Thompson and her best friend Sam happen upon a weather-making machine discarded by none other than Santa Claus, they use the machine to make it snow, causing a snow day and no school. What Allie doesn't know is that the machine is broken and causes a blizzard throughout California! Now Allie’s dad won’t be able to fly home for Christmas. It’s up to Allie and Sam to help Santa and his elves fix the machine before Christmas morning.