A historic Super El Niño is developing in the Pacific, but the 2026-2027 winter could look very different from previous strong El Niño seasons, according to a new forecast from Direct Weather.
The current Niño 3.4 index has reached approximately 2.85 degrees Celsius above average, surpassing the 2.6-degree reading recorded during the 2015-2016 El Niño. Some forecast models suggest the event could strengthen further into November and December, potentially reaching unprecedented territory.
However the strength of El Niño alone will not determine how winter unfolds across North America. One of the biggest wildcards is the Pacific Decadal Oscillation, or PDO, which describes patterns of sea surface temperature variations in the North Pacific.
A Different Pacific Pattern Could Change Winter
Typically, strong El Niño events coincide with a positive PDO, featuring relatively warmer waters closer to the North American West Coast. This pattern can encourage a strong Pacific jet stream and contribute to warmer winter conditions across the northern United States.
This season however, Direct Weather is monitoring a negative PDO pattern, with relatively cooler waters near the West Coast and warmer anomalies farther west in the Pacific.
That configuration could shift the jet stream southward, potentially allowing more Arctic air to reach the central and eastern United States instead of being displaced northward. The unusual combination makes historical comparisons difficult because strong El Niño events rarely coincide with a negative PDO.
Could This Mean More Snow and Cold?
The 1997-1998 and 2015-2016 El Niño seasons brought widespread warmth across the northern and northeastern United States. In contrast, the 2009-2010 winter featured colder conditions across much of the central and eastern country, along with historic snowfall in the Mid-Atlantic, including the Washington, D.C., region.
The forecast also points to increasing autumn snow and ice coverage across parts of the Arctic and Canada as a potential factor that could help reinforce intrusions of cold air into the United States.
The evolving pattern could mean opportunities for colder temperatures and snow-producing storms in regions that sometimes struggle during strong El Niño winters, a good sign for skiers and snowboarders across the country.. However the forecast does not guarantee a colder or snowier season nationwide, and regional precipitation patterns remain uncertain.