El Nino is a weather phenomenon that occurs every few years in the Pacific Ocean.
It causes warmer than usual water temperatures, which can affect weather patterns around the world.
In the US, El Nino is expected to bring above-average precipitation to parts of the West Coast.
This could mean another great ski year for resorts in California, Nevada, and Utah.
Last year, many ski resorts in these areas saw record-breaking snowfall and visitor numbers.
However, El Nino can also bring negative effects, such as flooding and landslides.
It's important for people in affected areas to stay informed and prepared for any potential hazards.