"El Nino" is an atmospheric phenomenon, where the easterly trade winds in the equatorial Pacific weaken. This allows for the release of the warm surface water build up near Indonesia, and a general warming of the entire Pacific Ocean.
But how does a warmer ocean affect the amount of rain we get in California?
Meteorologist at the National Weather Service in Hanford, Brian Ochs said, "if you have warmer sea surface temperatures over a larger area of the tropical Pacific you'll have more of a moisture source to tap into. Usually during our active seasons where we get a lot of precipitation we get these atmospheric rivers that will set up."
Atmospheric rivers coined the "Pineapple Express" because they form near Hawaii and the tropical Pacific.
Right now, the temperature of the sea surface is just a couple degrees above average, but it's forecast to get warmer as we head into next winter.
And a warmer Pacific means a stronger "El Nino" and the potential for more rain.
The questions is, how warm will the ocean get?
Brian Ochs said, "you're looking anywhere around zero to around five degrees Fahrenheit. So there is a lot of uncertainty as far as how strong the 'El Nino' is going to get."
The National Oceanic and Atmospheric Association's Climate Prediction Center has issued an "El Nino Advisory", saying there's a greater than 80% chance "El Nino" will last through next winter.
But so far, it only gives central and southern California a 35% chance of above average precipitation.
We will have a better idea on how warm the ocean will get and how strong the "El Nino" will be in the next few months.
But for now, we can expect a hot and dry summer.