Other national weather services have slightly different criteria but generally agree that if the current conditions persist or intensify, there will be an El Niño event.
NOAA has issued an El Niño Advisory meaning that El Niño conditions are currently occurring and expected to continue. For this to be an El Niño event, these conditions will have to persist through October. Other national weather services have slightly different criteria but generally agree that if the current conditions persist or intensify, there will be an El Niño event.