It's a cycle of warm water upwelling that occurs on the Western edge of the Atlantic Ocean, every seven years this upwelling fails to occur... this is known as El Nino!
But as they say in
Airplane..... that's not important right now

Now that could be a subject to start an off-topic thread about!!

"these people need a hospital"
"A hospital? What is it?"
"A big building that treats the sick, but thats not important right now"