03/27/2023, 10:40 am EDT
The upper ocean heat in the equatorial East Pacific is warming sharply. An old Kelvin Wave shifting eastward arrived on the northwest coast of South America the past 1-2 weeks and has caused steady impressive warming in the Nino12 SSTA region. A new Kelvin Wave has shifted east of the Dateline to about 145-140W longitude. The new Kelvin Wave is forecast to reach the northwest South America coast by early May.