EventNASA data shows the Arctic polar vortex was stronger than average in mid‑September, while a very strong El Niño is developing in the tropical Pacific. Long‑range forecasts from the European Centre for Medium‑Range Weather Forecasts and NOAA suggest the vortex could weaken in January and February, potentially allowing colder air to move south into the United States.
The seasonal polar vortex in the Arctic is currently stronger than normal, but long‑range forecasts suggest it may weaken in January and February, potentially allowing cold Arctic air to move south as a very strong El Niño develops.
The polar vortex is stronger than normal late in September and may weaken later in the winter, while a very strong El Niño could influence its strength and the United States' winter weather patterns.
NASA data shows the Arctic polar vortex was stronger than average in mid‑September, while a very strong El Niño is supporting a weakening trend for mid‑winter conditions.
