The El Niño watch is on

 

The SST anomalies off the western coast of South America are pretty high. 

Apparently, the three-year run of La Niña in the equatorial Pacific Ocean is coming to a close, and a lot of people are very interested in seeing if there's a rapid switchover to El Niño, or if the decline of La Niña will result in a long stall in the neutral state. 

Read more in this Washington Post article.

La Niña is over. Scientists eye ‘rapid’ switch to planet-warming El Niño.

"Still, El Niño’s arrival remains uncertain, the climate forecasters stressed. They predict just greater than 50-50 odds of El Niño in late summer, approaching a two-in-three chance by fall. And they note that any predictions made during the spring regarding El Niño or La Niña “are less accurate” because the climate is typically in transition at this time of year."

So, the watch phrase is the classic weather statement of uncertainty:  Weight n' C.