The much-talked-about El Niño climate pattern in the Pacific Ocean has officially reached "super" strength, and forecasters said Thursday that it could deliver winter weather patterns for the record books to Pennsylvania.
The National Oceanic and Atmospheric Administration's Climate Prediction Center put the chances of that happening at around 60 percent for the overlapping October-December and November-January periods. The probability of a strong to very strong El Niño remains above 79 percent through January-March 2027.
Accuweather forecasters said the El Niño could rival or surpass the strongest events recorded since 1950. The climate pattern has reached "super status" only six times in 75 times
Despite the threat of major storms, Pennsylvania residents around the mid-Atlantic area can expect below-average snowfall for the season as a whole, according to AccuWeather's latest winter outlook, which notes that there is still room for a major East Coast storm later in winter.
In general, the northern areas should continue to expect unusually warm and dry weather.
The winter effects of the climate pattern appear to be settling in one to two months early, El Niño expert Eric Webb told The Weather Company.
Albuquerque, New Mexico; Flagstaff, Arizona; and West Palm Beach, Florida, had their wettest fall to date through Nov. 4, while Chicago, Dallas, Houston and Nashville were among dozens of central U.S. cities having their warmest.
The Philadelphia area is not having a record setting autumn but it is considered unusually warm and unusually dry, with a recent 18-day streak of no measurable precipitation, the National Weather Service said.
A Winter Weather Driver
El Niño involves unusually warm water in the central and eastern equatorial Pacific and accompanying changes in atmospheric circulation. NOAA said the ocean and atmosphere both showed the pattern continuing to strengthen in October.
Federal forecasters expect strengthening to continue before El Niño begins weakening in early 2027. A very strong El Niño increases the likelihood of a wetter winter across the southern United States and a milder winter across much of the North, but NOAA cautioned those outcomes aren't guaranteed.
Regional Winter Outlooks
Northeast and New England: Much of the Northeast could have a milder winter with fewer Arctic outbreaks. AccuWeather forecasts below-average snow but says East Coast cities could still get a consequential storm, particularly in late January or February.
Midwest and Great Lakes: Warmer conditions and fewer Arctic intrusions could reduce heating needs.
Northern Plains: A milder winter is favored as El Niño limits Arctic outbreaks.
Southern Plains and Texas: An active southern storm track favors wetter conditions toward the Gulf Coast.
Southeast and Florida: Wetter weather is favored along the Gulf Coast. Florida faces an elevated risk of severe storms and tornadoes.
California and West Coast: Additional atmospheric rivers could bring flooding, landslides and substantial mountain snow.
Pacific Northwest: Accuweather's December-February map favors drier conditions across Washington, Oregon and parts of Idaho, with the stronger Pacific storm track directed farther south.
Southwest and interior West: Wetter conditions are favored across California, the Southwest and into the southern Plains. The map places the northern Rockies closer to the warmer northern tier.
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