El Niño has arrived. What does that mean for weather in 2019?

El Niño has arrived in 2019. So far, it's pretty weak. That doesn't mean it will stay that way. 
The National Oceanic and Atmospheric Administration (NOAA) announced Thursday that this natural climate phenomenon — which is triggered by warmer temperatures in the equatorial Pacific Ocean and can significantly affect weather in the U.S. — will likely persist through the spring. But what happens next is still unclear.
"We don’t have a good handle on where this goes the