Weakening trade winds are allowing warm water to move east across the Pacific in a telltale pattern.
Published Aug 5, 2015
Conditions in May 2014 look similar to those in May 1997, a year that brought one of the most potent El Niño events of the 20th century.
Published May 14, 2014
Cooler than normal conditions prevail in the central and eastern Pacific, but the event is so far considered weak.
Published Dec 22, 2017
Past events suggest the phenomenon winds down after December and January. But will this year follow the pattern?
Published Jan 22, 2016
After appearing for two consecutive winters, La Niña appears to be taking some time off.
Published May 4, 2012
With each passing month, 2015 looks more and more like 1997.
Published Oct 13, 2015
The near-record water temperatures of 2015-16 has been followed by a modest, quiet appearance of La Niña.
Published Jan 6, 2017
Temperature anomalies in the eastern Pacific Ocean are both influencing and being influenced by unusual weather patterns. The effects are rippling through the marine environment.
Published Apr 18, 2015
Acquired September 6, 2010, this map shows cooling in the central Pacific Ocean consistent with La Niña conditions.
Published Sep 19, 2010
With its own forms of underwater weather, the ocean has fronts and circulation patterns that move heat and nutrients around its basins. Changes near the surface often start with changes in the depths.
Published Mar 21, 2017
These color-coded images show the strengthening of El Niño between October and November 2009. In the November image, warm waters (indicated in red) have spread across the Pacific.
Published Dec 11, 2009
